X-Git-Url: https://git.gag.com/?a=blobdiff_plain;f=src%2FSDCCopt.c;h=c799bed2de0d887594170d6d07572d85bd821638;hb=80972b2e54c9b88f11c27b878874fd2a6a681391;hp=1f12948b8edb3a961cb27fdc5573c902ce4d9493;hpb=0e486caba2e97c32e1bf2030d45dddce103beae4;p=fw%2Fsdcc diff --git a/src/SDCCopt.c b/src/SDCCopt.c index 1f12948b..c799bed2 100644 --- a/src/SDCCopt.c +++ b/src/SDCCopt.c @@ -1,9 +1,9 @@ /*------------------------------------------------------------------------- SDCCopt.c - calls all the optimizations routines and does some of the hackier transformations, these include translating iCodes - to function calls and replacing local variables with their - register equivalents etc. Also contains the driver routine - for dead code elimination + to function calls and replacing local variables with their + register equivalents etc. Also contains the driver routine + for dead code elimination Written By - Sandeep Dutta . sandeep.dutta@usa.net (1998) @@ -11,26 +11,27 @@ under the terms of the GNU General Public License as published by the Free Software Foundation; either version 2, or (at your option) any later version. - + This program is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details. - + You should have received a copy of the GNU General Public License along with this program; if not, write to the Free Software Foundation, 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. - + In other words, you are welcome to use, share and improve this program. You are forbidden to forbid anyone else to use, share and improve - what you give them. Help stamp out software-hoarding! + what you give them. Help stamp out software-hoarding! -------------------------------------------------------------------------*/ +#include #include "common.h" /*-----------------------------------------------------------------*/ /* global variables */ -int cseDefNum = 0 ; +int cseDefNum = 0; char flowChanged = 0; @@ -38,608 +39,1437 @@ char flowChanged = 0; /*-----------------------------------------------------------------*/ /* printSymName - prints the symbol names */ /*-----------------------------------------------------------------*/ -int printSymName (void *vsym) +int +printSymName (void *vsym) { - symbol *sym = vsym ; - fprintf (stdout, " %s ", sym->name); - return 0; + symbol *sym = vsym; + fprintf (stdout, " %s ", sym->name); + return 0; } /*-----------------------------------------------------------------*/ /* cnvToFcall - does the actual conversion to function call */ /*-----------------------------------------------------------------*/ -static void cnvToFcall (iCode *ic,eBBlock *ebp) +static void +cnvToFcall (iCode * ic, eBBlock * ebp) { - iCode *ip ; - iCode *newic; - operand *left ; - operand *right; - symbol *func = NULL; - int lineno = ic->lineno; - - ip = ic->next ; /* insertion point */ - /* remove it from the iCode */ - remiCodeFromeBBlock (ebp,ic); - - left = IC_LEFT(ic); - right= IC_RIGHT(ic); - - switch (ic->op) { - case '+' : - func = __fsadd ; - break; - case '-' : - func = __fssub; - break; - case '/' : - func = __fsdiv; - break; - case '*' : - func = __fsmul; - break; - case EQ_OP : - func = __fseq; - break; - case NE_OP : - func = __fsneq ; - break; - case '<' : - func = __fslt ; - break; - case '>': - func = __fsgt; - break; - case LE_OP : - func = __fslteq; - break; - case GE_OP : - func = __fsgteq ; - break; + iCode *ip; + iCode *newic; + operand *left; + operand *right; + symbol *func = NULL; + char *filename = ic->filename; + int lineno = ic->lineno; + int bytesPushed=0; + + ip = ic->next; /* insertion point */ + /* remove it from the iCode */ + remiCodeFromeBBlock (ebp, ic); + + left = IC_LEFT (ic); + right = IC_RIGHT (ic); + + if (IS_SYMOP (left)) + bitVectUnSetBit (OP_USES (left), ic->key); + if (IS_SYMOP (right)) + bitVectUnSetBit (OP_USES (right), ic->key); + + if (IS_FLOAT (operandType (right))) { + switch (ic->op) + { + case '+': + func = __fsadd; + break; + case '-': + func = __fssub; + break; + case '/': + func = __fsdiv; + break; + case '*': + func = __fsmul; + break; + case EQ_OP: + func = __fseq; + break; + case NE_OP: + func = __fsneq; + break; + case '<': + func = __fslt; + break; + case '>': + func = __fsgt; + break; + case LE_OP: + func = __fslteq; + break; + case GE_OP: + func = __fsgteq; + break; + } + } else + if (IS_FIXED16X16 (operandType (right))) { + switch (ic->op) + { + case '+': + func = __fps16x16_add; + break; + case '-': + func = __fps16x16_sub; + break; + case '/': + func = __fps16x16_div; + break; + case '*': + func = __fps16x16_mul; + break; + case EQ_OP: + func = __fps16x16_eq; + break; + case NE_OP: + func = __fps16x16_neq; + break; + case '<': + func = __fps16x16_lt; + break; + case '>': + func = __fps16x16_gt; + break; + case LE_OP: + func = __fps16x16_lteq; + break; + case GE_OP: + func = __fps16x16_gteq; + break; + } + } + + + /* if float support routines NOT compiled as reentrant */ + if (!options.float_rent) + { + + /* first one */ + if (IS_REGPARM (FUNC_ARGS(func->type)->etype)) + { + newic = newiCode (SEND, left, NULL); + newic->argreg = SPEC_ARGREG(FUNC_ARGS(func->type)->etype); + } + else + { + newic = newiCode ('=', NULL, left); + IC_RESULT (newic) = operandFromValue (FUNC_ARGS(func->type)); + } + + addiCodeToeBBlock (ebp, newic, ip); + newic->filename = filename; + newic->lineno = lineno; + if (IS_SYMOP (left)) + OP_USES (left) = bitVectSetBit (OP_USES (left), newic->key); + + /* second one */ + if (IS_REGPARM (FUNC_ARGS(func->type)->next->etype)) + { + newic = newiCode (SEND, right, NULL); + newic->argreg = SPEC_ARGREG(FUNC_ARGS(func->type)->next->etype); + } + else + { + newic = newiCode ('=', NULL, right); + IC_RESULT (newic) = operandFromValue (FUNC_ARGS(func->type)->next); + } + addiCodeToeBBlock (ebp, newic, ip); + newic->filename = filename; + newic->lineno = lineno; + if (IS_SYMOP (right)) + OP_USES (right) = bitVectSetBit (OP_USES (right), newic->key); + } + else + { + + /* push right */ + if (IS_REGPARM (FUNC_ARGS(func->type)->next->etype)) + { + newic = newiCode (SEND, right, NULL); + newic->argreg = SPEC_ARGREG(FUNC_ARGS(func->type)->next->etype); + } + else + { + newic = newiCode (IPUSH, right, NULL); + newic->parmPush = 1; + bytesPushed += getSize(operandType(right)); + } + + addiCodeToeBBlock (ebp, newic, ip); + newic->filename = filename; + newic->lineno = lineno; + if (IS_SYMOP (right)) + OP_USES (right) = bitVectSetBit (OP_USES (right), newic->key); + + /* insert push left */ + if (IS_REGPARM (FUNC_ARGS(func->type)->etype)) + { + newic = newiCode (SEND, left, NULL); + newic->argreg = SPEC_ARGREG(FUNC_ARGS(func->type)->etype); + } + else + { + newic = newiCode (IPUSH, left, NULL); + newic->parmPush = 1; + bytesPushed += getSize(operandType(left)); + } + addiCodeToeBBlock (ebp, newic, ip); + newic->filename = filename; + newic->lineno = lineno; + if (IS_SYMOP (left)) + OP_USES (left) = bitVectSetBit (OP_USES (left), newic->key); - /* if float support routines NOT compiled as reentrant */ - if (! options.float_rent) { - - /* first one */ - if (IS_REGPARM(func->args->etype)) { - newic = newiCode(SEND,IC_LEFT(ic),NULL); - } else { - newic = newiCode('=',NULL,IC_LEFT(ic)); - IC_RESULT(newic) = operandFromValue(func->args); - } - - addiCodeToeBBlock(ebp,newic,ip); - newic->lineno = lineno; - - /* second one */ - if (IS_REGPARM(func->args->next->etype)) { - newic = newiCode(SEND,IC_LEFT(ic),NULL); - } else { - newic = newiCode('=',NULL,IC_RIGHT(ic)); - IC_RESULT(newic) = operandFromValue(func->args->next); - } - addiCodeToeBBlock(ebp,newic,ip); - newic->lineno = lineno; - - } else { - - /* push right */ - if (IS_REGPARM(func->args->next->etype)) { - newic = newiCode(SEND,right,NULL); - } else { - newic = newiCode(IPUSH,right,NULL); - newic->parmPush = 1; - } - - addiCodeToeBBlock (ebp,newic,ip); - newic->lineno = lineno; - - /* insert push left */ - if (IS_REGPARM(func->args->etype)) { - newic = newiCode(SEND,left,NULL); - } else { - newic = newiCode(IPUSH,left,NULL); - newic->parmPush = 1; - } - addiCodeToeBBlock (ebp,newic,ip); - newic->lineno = lineno; } - /* insert the call */ - newic = newiCode(CALL,operandFromSymbol(func),NULL); - IC_RESULT(newic) = IC_RESULT(ic); - addiCodeToeBBlock(ebp,newic,ip); - newic->lineno = lineno; + /* insert the call */ + newic = newiCode (CALL, operandFromSymbol (func), NULL); + IC_RESULT (newic) = IC_RESULT (ic); + bitVectUnSetBit (OP_DEFS (IC_RESULT (ic)), ic->key); + OP_USES (IC_RESULT (newic)) = bitVectSetBit (OP_USES (IC_RESULT (newic)), newic->key); + newic->filename = filename; + newic->lineno = lineno; + newic->parmBytes += bytesPushed; + ebp->hasFcall = 1; + if (currFunc) + FUNC_HASFCALL (currFunc->type) = 1; + + if(TARGET_IS_PIC16 || TARGET_IS_PIC) { + /* normally these functions aren't marked external, so we can use their + * _extern field to marked as already added to symbol table */ + + if(!SPEC_EXTR(func->etype)) { + memmap *seg = SPEC_OCLS(OP_SYMBOL(IC_LEFT(newic))->etype); + + SPEC_EXTR(func->etype) = 1; + seg = SPEC_OCLS( func->etype ); + addSet(&seg->syms, func); + } + } + + addiCodeToeBBlock (ebp, newic, ip); } /*-----------------------------------------------------------------*/ /* cnvToFloatCast - converts casts to floats to function calls */ /*-----------------------------------------------------------------*/ -static void cnvToFloatCast (iCode *ic, eBBlock *ebp) -{ - iCode *ip, *newic; - symbol *func; - sym_link *type = operandType(IC_RIGHT(ic)); - int linenno = ic->lineno; - int bwd, su; - - ip = ic->next ; - /* remove it from the iCode */ - remiCodeFromeBBlock (ebp,ic); - /* depending on the type */ - for (bwd = 0; bwd < 3; bwd++) { - for (su = 0; su < 2; su++) { - if (checkType(type, __multypes[bwd][su]) == 1) { - func = __conv[0][bwd][su]; - goto found; - } - } +static void +cnvToFloatCast (iCode * ic, eBBlock * ebp) +{ + iCode *ip, *newic; + symbol *func = NULL; + sym_link *type = operandType (IC_RIGHT (ic)); + int linenno = ic->lineno; + int bwd, su; + int bytesPushed=0; + + ip = ic->next; + /* remove it from the iCode */ + remiCodeFromeBBlock (ebp, ic); + /* depending on the type */ + for (bwd = 0; bwd < 3; bwd++) + { + for (su = 0; su < 2; su++) + { + if (compareType (type, __multypes[bwd][su]) == 1) + { + func = __conv[0][bwd][su]; + goto found; + } + } } - assert(0); - found: - - /* if float support routines NOT compiled as reentrant */ - if (! options.float_rent) { - /* first one */ - if (IS_REGPARM(func->args->etype)) - newic = newiCode(SEND,IC_RIGHT(ic),NULL); - else { - newic = newiCode('=',NULL,IC_RIGHT(ic)); - IC_RESULT(newic) = operandFromValue(func->args); - } - addiCodeToeBBlock(ebp,newic,ip); - newic->lineno = linenno; - - } else { - /* push the left */ - if (IS_REGPARM(func->args->etype)) - newic = newiCode(SEND,IC_RIGHT(ic),NULL); - else { - newic = newiCode(IPUSH,IC_RIGHT(ic),NULL); - newic->parmPush = 1; - } - addiCodeToeBBlock(ebp,newic,ip); - newic->lineno = linenno; - + + if(compareType (type, fixed16x16Type) == 1) { + func = __fp16x16conv[0][3][0]; + goto found; + } + + assert (0); +found: + + /* if float support routines NOT compiled as reentrant */ + if (!options.float_rent) + { + /* first one */ + if (IS_REGPARM (FUNC_ARGS(func->type)->etype)) + { + newic = newiCode (SEND, IC_RIGHT (ic), NULL); + newic->argreg = SPEC_ARGREG(FUNC_ARGS(func->type)->etype); + } + else + { + newic = newiCode ('=', NULL, IC_RIGHT (ic)); + IC_RESULT (newic) = operandFromValue (FUNC_ARGS(func->type)); + } + addiCodeToeBBlock (ebp, newic, ip); + newic->filename = filename; + newic->lineno = linenno; + } + else + { + /* push the left */ + if (IS_REGPARM (FUNC_ARGS(func->type)->etype)) { + newic = newiCode (SEND, IC_RIGHT (ic), NULL); + newic->argreg = SPEC_ARGREG(FUNC_ARGS(func->type)->etype); + } + else + { + newic = newiCode (IPUSH, IC_RIGHT (ic), NULL); + newic->parmPush = 1; + bytesPushed += getSize(operandType(IC_RIGHT(ic))); + } + addiCodeToeBBlock (ebp, newic, ip); + newic->filename = filename; + newic->lineno = linenno; + } + + /* make the call */ + newic = newiCode (CALL, operandFromSymbol (func), NULL); + IC_RESULT (newic) = IC_RESULT (ic); + newic->parmBytes+=bytesPushed; + ebp->hasFcall = 1; + if (currFunc) + FUNC_HASFCALL (currFunc->type) = 1; - /* make the call */ - newic = newiCode(CALL,operandFromSymbol(func),NULL); - IC_RESULT(newic) = IC_RESULT(ic); - addiCodeToeBBlock(ebp,newic,ip); - newic->lineno = linenno; + if(TARGET_IS_PIC16 || TARGET_IS_PIC) { + /* normally these functions aren't marked external, so we can use their + * _extern field to marked as already added to symbol table */ + if(!SPEC_EXTR(func->etype)) { + memmap *seg = SPEC_OCLS(OP_SYMBOL(IC_LEFT(newic))->etype); + + SPEC_EXTR(func->etype) = 1; + seg = SPEC_OCLS( func->etype ); + addSet(&seg->syms, func); + } + } + + addiCodeToeBBlock (ebp, newic, ip); + newic->filename = filename; + newic->lineno = linenno; +} + +/*----------------------------------------------------------------------*/ +/* cnvToFixed16x16Cast - converts casts to fixed16x16 to function calls */ +/*----------------------------------------------------------------------*/ +static void +cnvToFixed16x16Cast (iCode * ic, eBBlock * ebp) +{ + iCode *ip, *newic; + symbol *func = NULL; + sym_link *type = operandType (IC_RIGHT (ic)); + int linenno = ic->lineno; + int bwd, su; + int bytesPushed=0; + + ip = ic->next; + /* remove it from the iCode */ + remiCodeFromeBBlock (ebp, ic); + /* depending on the type */ + for (bwd = 0; bwd < 3; bwd++) + { + for (su = 0; su < 2; su++) + { + if (compareType (type, __multypes[bwd][su]) == 1) + { + func = __fp16x16conv[0][bwd][su]; + goto found; + } + } + } + assert (0); +found: + + /* if float support routines NOT compiled as reentrant */ + if (!options.float_rent) + { + /* first one */ + if (IS_REGPARM (FUNC_ARGS(func->type)->etype)) + { + newic = newiCode (SEND, IC_RIGHT (ic), NULL); + newic->argreg = SPEC_ARGREG(FUNC_ARGS(func->type)->etype); + } + else + { + newic = newiCode ('=', NULL, IC_RIGHT (ic)); + IC_RESULT (newic) = operandFromValue (FUNC_ARGS(func->type)); + } + addiCodeToeBBlock (ebp, newic, ip); + newic->filename = filename; + newic->lineno = linenno; + + } + else + { + /* push the left */ + if (IS_REGPARM (FUNC_ARGS(func->type)->etype)) { + newic = newiCode (SEND, IC_RIGHT (ic), NULL); + newic->argreg = SPEC_ARGREG(FUNC_ARGS(func->type)->etype); + } + else + { + newic = newiCode (IPUSH, IC_RIGHT (ic), NULL); + newic->parmPush = 1; + bytesPushed += getSize(operandType(IC_RIGHT(ic))); + } + addiCodeToeBBlock (ebp, newic, ip); + newic->filename = filename; + newic->lineno = linenno; + } + + /* make the call */ + newic = newiCode (CALL, operandFromSymbol (func), NULL); + IC_RESULT (newic) = IC_RESULT (ic); + newic->parmBytes+=bytesPushed; + ebp->hasFcall = 1; + if (currFunc) + FUNC_HASFCALL (currFunc->type) = 1; + + if(TARGET_IS_PIC16 || TARGET_IS_PIC) { + /* normally these functions aren't marked external, so we can use their + * _extern field to marked as already added to symbol table */ + + if(!SPEC_EXTR(func->etype)) { + memmap *seg = SPEC_OCLS(OP_SYMBOL(IC_LEFT(newic))->etype); + + SPEC_EXTR(func->etype) = 1; + seg = SPEC_OCLS( func->etype ); + addSet(&seg->syms, func); + } + } + + addiCodeToeBBlock (ebp, newic, ip); + newic->filename = filename; + newic->lineno = linenno; } /*-----------------------------------------------------------------*/ /* cnvFromFloatCast - converts casts From floats to function calls */ /*-----------------------------------------------------------------*/ -static void cnvFromFloatCast (iCode *ic, eBBlock *ebp) +static void +cnvFromFloatCast (iCode * ic, eBBlock * ebp) +{ + iCode *ip, *newic; + symbol *func = NULL; + sym_link *type = operandType (IC_LEFT (ic)); + char *filename = ic->filename; + int lineno = ic->lineno; + int bwd, su; + int bytesPushed=0; + + ip = ic->next; + /* remove it from the iCode */ + remiCodeFromeBBlock (ebp, ic); + + /* depending on the type */ + for (bwd = 0; bwd < 3; bwd++) + { + for (su = 0; su < 2; su++) + { + if (compareType (type, __multypes[bwd][su]) == 1) + { + func = __conv[1][bwd][su]; + goto found; + } + } + } + assert (0); +found: + + /* if float support routines NOT compiled as reentrant */ + if (!options.float_rent) + { + /* first one */ + if (IS_REGPARM (FUNC_ARGS(func->type)->etype)) { + newic = newiCode (SEND, IC_RIGHT (ic), NULL); + newic->argreg = SPEC_ARGREG(FUNC_ARGS(func->type)->etype); + } + else + { + newic = newiCode ('=', NULL, IC_RIGHT (ic)); + IC_RESULT (newic) = operandFromValue (FUNC_ARGS(func->type)); + } + addiCodeToeBBlock (ebp, newic, ip); + newic->filename = filename; + newic->lineno = lineno; + + } + else + { + + /* push the left */ + if (IS_REGPARM (FUNC_ARGS(func->type)->etype)) { + newic = newiCode (SEND, IC_RIGHT (ic), NULL); + newic->argreg = SPEC_ARGREG(FUNC_ARGS(func->type)->etype); + } + else + { + newic = newiCode (IPUSH, IC_RIGHT (ic), NULL); + newic->parmPush = 1; + bytesPushed += getSize(operandType(IC_RIGHT(ic))); + } + addiCodeToeBBlock (ebp, newic, ip); + newic->filename = filename; + newic->lineno = lineno; + + } + + /* make the call */ + newic = newiCode (CALL, operandFromSymbol (func), NULL); + IC_RESULT (newic) = IC_RESULT (ic); + newic->parmBytes+=bytesPushed; + ebp->hasFcall = 1; + if (currFunc) + FUNC_HASFCALL (currFunc->type) = 1; + + if(TARGET_IS_PIC16 || TARGET_IS_PIC) { + /* normally these functions aren't marked external, so we can use their + * _extern field to marked as already added to symbol table */ + + if(!SPEC_EXTR(func->etype)) { + memmap *seg = SPEC_OCLS(OP_SYMBOL(IC_LEFT(newic))->etype); + + SPEC_EXTR(func->etype) = 1; + seg = SPEC_OCLS( func->etype ); + addSet(&seg->syms, func); + } + } + + addiCodeToeBBlock (ebp, newic, ip); + newic->filename = filename; + newic->lineno = lineno; +} + +/*--------------------------------------------------------------------------*/ +/* cnvFromFixed16x16Cast - converts casts from fixed16x16 to function calls */ +/*--------------------------------------------------------------------------*/ +static void +cnvFromFixed16x16Cast (iCode * ic, eBBlock * ebp) { - iCode *ip, *newic; - symbol *func; - sym_link *type = operandType(IC_LEFT(ic)); - int lineno = ic->lineno ; - int bwd, su; - - ip = ic->next ; - /* remove it from the iCode */ - remiCodeFromeBBlock (ebp,ic); - - /* depending on the type */ - for (bwd = 0; bwd < 3; bwd++) { - for (su = 0; su < 2; su++) { - if (checkType(type, __multypes[bwd][su]) == 1) { - func = __conv[1][bwd][su]; - goto found; - } - } + iCode *ip, *newic; + symbol *func = NULL; + sym_link *type = operandType (IC_LEFT (ic)); + char *filename = ic->filename; + int lineno = ic->lineno; + int bwd, su; + int bytesPushed=0; + + ip = ic->next; + /* remove it from the iCode */ + remiCodeFromeBBlock (ebp, ic); + + /* depending on the type */ + for (bwd = 0; bwd < 3; bwd++) + { + for (su = 0; su < 2; su++) + { + if (compareType (type, __multypes[bwd][su]) == 1) + { + func = __fp16x16conv[1][bwd][su]; + goto found; + } + } + } + + if (compareType (type, floatType) == 1) + { + func = __fp16x16conv[1][3][0]; + goto found; } - assert(0); - found: - - /* if float support routines NOT compiled as reentrant */ - if (! options.float_rent) { - /* first one */ - if (IS_REGPARM(func->args->etype)) - newic = newiCode(SEND,IC_RIGHT(ic),NULL); - else { - newic = newiCode('=',NULL,IC_RIGHT(ic)); - IC_RESULT(newic) = operandFromValue(func->args); - } - addiCodeToeBBlock(ebp,newic,ip); - newic->lineno = lineno; - - } else { - - /* push the left */ - if (IS_REGPARM(func->args->etype)) - newic = newiCode(SEND,IC_RIGHT(ic),NULL); - else { - newic = newiCode(IPUSH,IC_RIGHT(ic),NULL); - newic->parmPush = 1; - } - addiCodeToeBBlock(ebp,newic,ip); - newic->lineno = lineno; + assert (0); +found: + + /* if float support routines NOT compiled as reentrant */ + if (!options.float_rent) + { + /* first one */ + if (IS_REGPARM (FUNC_ARGS(func->type)->etype)) { + newic = newiCode (SEND, IC_RIGHT (ic), NULL); + newic->argreg = SPEC_ARGREG(FUNC_ARGS(func->type)->etype); + } + else + { + newic = newiCode ('=', NULL, IC_RIGHT (ic)); + IC_RESULT (newic) = operandFromValue (FUNC_ARGS(func->type)); + } + addiCodeToeBBlock (ebp, newic, ip); + newic->filename = filename; + newic->lineno = lineno; } + else + { - /* make the call */ - newic = newiCode(CALL,operandFromSymbol(func),NULL); - IC_RESULT(newic) = IC_RESULT(ic); - addiCodeToeBBlock(ebp,newic,ip); - newic->lineno = lineno; + /* push the left */ + if (IS_REGPARM (FUNC_ARGS(func->type)->etype)) { + newic = newiCode (SEND, IC_RIGHT (ic), NULL); + newic->argreg = SPEC_ARGREG(FUNC_ARGS(func->type)->etype); + } + else + { + newic = newiCode (IPUSH, IC_RIGHT (ic), NULL); + newic->parmPush = 1; + bytesPushed += getSize(operandType(IC_RIGHT(ic))); + } + addiCodeToeBBlock (ebp, newic, ip); + newic->filename = filename; + newic->lineno = lineno; + } + + /* make the call */ + newic = newiCode (CALL, operandFromSymbol (func), NULL); + IC_RESULT (newic) = IC_RESULT (ic); + newic->parmBytes+=bytesPushed; + ebp->hasFcall = 1; + if (currFunc) + FUNC_HASFCALL (currFunc->type) = 1; + + if(TARGET_IS_PIC16 || TARGET_IS_PIC) { + /* normally these functions aren't marked external, so we can use their + * _extern field to marked as already added to symbol table */ + + if(!SPEC_EXTR(func->etype)) { + memmap *seg = SPEC_OCLS(OP_SYMBOL(IC_LEFT(newic))->etype); + SPEC_EXTR(func->etype) = 1; + seg = SPEC_OCLS( func->etype ); + addSet(&seg->syms, func); + } + } + + addiCodeToeBBlock (ebp, newic, ip); + newic->filename = filename; + newic->lineno = lineno; } +extern operand *geniCodeRValue (operand *, bool); + /*-----------------------------------------------------------------*/ /* convilong - converts int or long mults or divs to fcalls */ /*-----------------------------------------------------------------*/ -static void convilong (iCode *ic, eBBlock *ebp, sym_link *type, int op) -{ - symbol *func = NULL; - iCode *ip = ic->next; - iCode *newic ; - int lineno = ic->lineno; - int bwd; - int su; - remiCodeFromeBBlock (ebp,ic); - - /* depending on the type */ - for (bwd = 0; bwd < 3; bwd++) { - for (su = 0; su < 2; su++) { - if (checkType(type, __multypes[bwd][su]) == 1) { - if (op == '*') - func = __muldiv[0][bwd][su]; - else if (op == '/') - func = __muldiv[1][bwd][su]; - else if (op == '%') - func = __muldiv[2][bwd][su]; - else - assert(0); - goto found; - } - } +static void +convilong (iCode * ic, eBBlock * ebp) +{ + int op = ic->op; + symbol *func = NULL; + iCode *ip = ic->next; + iCode *newic; + char *filename = ic->filename; + int lineno = ic->lineno; + int bwd; + int su; + int bytesPushed=0; + sym_link *leftType = operandType (IC_LEFT (ic)); + sym_link *rightType = operandType (IC_RIGHT (ic)); + + remiCodeFromeBBlock (ebp, ic); + + if (getSize (leftType) == 1 && getSize (rightType) == 1) + { + int muldivmod; + + if (op == '*') + muldivmod = 0; + else if (op == '/') + muldivmod = 1; + else if (op == '%') + muldivmod = 2; + else + muldivmod = -1; + + for (su = 0; su < 4 && muldivmod >= 0; su++) + { + if ((compareType (leftType, __multypes[0][su%2]) == 1) && + (compareType (rightType, __multypes[0][su/2]) == 1)) + { + func = __muldiv[muldivmod][0][su]; + goto found; + } + } } - assert(0); - found: - /* if int & long support routines NOT compiled as reentrant */ - if (! options.intlong_rent) { - /* first one */ - if (IS_REGPARM(func->args->etype)) - newic = newiCode(SEND,IC_LEFT(ic),NULL); - else { - newic = newiCode('=',NULL,IC_LEFT(ic)); - IC_RESULT(newic) = operandFromValue(func->args); - } - addiCodeToeBBlock(ebp,newic,ip); - newic->lineno = lineno; - - /* second one */ - if (IS_REGPARM(func->args->next->etype)) - newic = newiCode(SEND,IC_RIGHT(ic),NULL); - else { - newic = newiCode('=',NULL,IC_RIGHT(ic)); - IC_RESULT(newic) = operandFromValue(func->args->next); - } - addiCodeToeBBlock(ebp,newic,ip); - newic->lineno = lineno; - - - } else { - - /* compiled as reentrant then push */ - /* push right */ - if (IS_REGPARM(func->args->next->etype)) - newic = newiCode(SEND,IC_RIGHT(ic),NULL); - else { - newic = newiCode(IPUSH,IC_RIGHT(ic),NULL); - newic->parmPush = 1; - } - addiCodeToeBBlock (ebp,newic,ip); - newic->lineno = lineno; - - /* insert push left */ - if (IS_REGPARM(func->args->etype)) - newic = newiCode(SEND,IC_LEFT(ic),NULL); - else { - newic = newiCode(IPUSH,IC_LEFT(ic),NULL); - newic->parmPush = 1; - } - addiCodeToeBBlock (ebp,newic,ip); - newic->lineno = lineno; + /* depending on the type */ + for (bwd = 0; bwd < 3; bwd++) + { + for (su = 0; su < 2; su++) + { + if (compareType (leftType, __multypes[bwd][su]) == 1) + { + if ((op=='*' || op=='/' || op=='%') && + compareType (rightType, __multypes[bwd][su]) != 1) + { + assert(0); + } + + if (op == '*') + func = __muldiv[0][bwd][su]; + else if (op == '/') + func = __muldiv[1][bwd][su]; + else if (op == '%') + func = __muldiv[2][bwd][su]; + else if (op == RRC) + func = __rlrr[1][bwd][su]; + else if (op == RLC) + func = __rlrr[0][bwd][su]; + else if (op == RIGHT_OP) + func = __rlrr[1][bwd][su]; + else if (op == LEFT_OP) + func = __rlrr[0][bwd][su]; + else + assert (0); + goto found; + } + } } + assert (0); +found: + /* if int & long support routines NOT compiled as reentrant */ + if (!options.intlong_rent) + { + /* first one */ + if (IS_REGPARM (FUNC_ARGS(func->type)->etype)) { + newic = newiCode (SEND, IC_LEFT (ic), NULL); + newic->argreg = SPEC_ARGREG(FUNC_ARGS(func->type)->etype); + } + else + { + newic = newiCode ('=', NULL, IC_LEFT (ic)); + IC_RESULT (newic) = operandFromValue (FUNC_ARGS(func->type)); + } + addiCodeToeBBlock (ebp, newic, ip); + newic->filename = filename; + newic->lineno = lineno; + + /* second one */ + if (IS_REGPARM (FUNC_ARGS(func->type)->next->etype)) { + newic = newiCode (SEND, IC_RIGHT (ic), NULL); + newic->argreg = SPEC_ARGREG(FUNC_ARGS(func->type)->next->etype); + } + else + { + newic = newiCode ('=', NULL, IC_RIGHT (ic)); + IC_RESULT (newic) = operandFromValue (FUNC_ARGS(func->type)->next); + } + addiCodeToeBBlock (ebp, newic, ip); + newic->filename = filename; + newic->lineno = lineno; - /* for the result */ - newic = newiCode(CALL,operandFromSymbol(func),NULL); - IC_RESULT(newic) = IC_RESULT(ic); - addiCodeToeBBlock(ebp,newic,ip); - newic->lineno = lineno; + } + else + { + /* compiled as reentrant then push */ + /* push right */ + if (IS_REGPARM (FUNC_ARGS(func->type)->next->etype)) + { + newic = newiCode (SEND, IC_RIGHT (ic), NULL); + newic->argreg = SPEC_ARGREG(FUNC_ARGS(func->type)->next->etype); + } + else + { + newic = newiCode (IPUSH, IC_RIGHT (ic), NULL); + newic->parmPush = 1; + + bytesPushed += getSize(operandType(IC_RIGHT(ic))); + } + addiCodeToeBBlock (ebp, newic, ip); + newic->filename = filename; + newic->lineno = lineno; + + /* insert push left */ + if (IS_REGPARM (FUNC_ARGS(func->type)->etype)) + { + newic = newiCode (SEND, IC_LEFT (ic), NULL); + newic->argreg = SPEC_ARGREG(FUNC_ARGS(func->type)->etype); + } + else + { + newic = newiCode (IPUSH, IC_LEFT (ic), NULL); + newic->parmPush = 1; + + bytesPushed += getSize(operandType(IC_LEFT(ic))); + } + addiCodeToeBBlock (ebp, newic, ip); + newic->filename = filename; + newic->lineno = lineno; + } + + /* for the result */ + newic = newiCode (CALL, operandFromSymbol (func), NULL); + IC_RESULT (newic) = IC_RESULT (ic); + newic->filename = filename; + newic->lineno = lineno; + newic->parmBytes+=bytesPushed; // to clear the stack after the call + ebp->hasFcall = 1; + if (currFunc) + FUNC_HASFCALL (currFunc->type) = 1; + + if(TARGET_IS_PIC || TARGET_IS_PIC16) { + /* normally these functions aren't marked external, so we can use their + * _extern field to marked as already added to symbol table */ + + if(!SPEC_EXTR(func->etype)) { + memmap *seg = SPEC_OCLS(OP_SYMBOL(IC_LEFT(newic))->etype); + + SPEC_EXTR(func->etype) = 1; + seg = SPEC_OCLS( func->etype ); + addSet(&seg->syms, func); + } + } + + addiCodeToeBBlock (ebp, newic, ip); } /*-----------------------------------------------------------------*/ /* convertToFcall - converts some operations to fcalls */ /*-----------------------------------------------------------------*/ -static void convertToFcall (eBBlock **ebbs, int count) +static void +convertToFcall (eBBlock ** ebbs, int count) { - int i ; - - /* for all blocks do */ - for (i = 0 ; i < count ; i++ ) { - iCode *ic ; - - /* for all instructions in the block do */ - for (ic = ebbs[i]->sch ; ic ; ic = ic->next ) { - - /* floating point operations are - converted to function calls */ - if ((IS_CONDITIONAL(ic) || - IS_ARITHMETIC_OP(ic) ) && - (IS_FLOAT(operandType(IC_RIGHT(ic))))) { - - cnvToFcall(ic,ebbs[i]); - } - - /* casting is a little different */ - if (ic->op == CAST ) { - if (IS_FLOAT(operandType(IC_RIGHT(ic)))) - cnvFromFloatCast (ic,ebbs[i]); - else - if (IS_FLOAT(operandType(IC_LEFT(ic)))) - cnvToFloatCast (ic,ebbs[i]); - } - - /* if long / int mult or divide or mod */ - if (ic->op == '*' || ic->op == '/' || ic->op == '%' ) { - - sym_link *type = operandType(IC_LEFT(ic)); - if (IS_INTEGRAL(type) && getSize(type) > port->muldiv.native_below) - convilong (ic,ebbs[i],type,ic->op); - } - } + int i; + + /* for all blocks do */ + for (i = 0; i < count; i++) + { + iCode *ic; + + /* for all instructions in the block do */ + for (ic = ebbs[i]->sch; ic; ic = ic->next) + { + + /* floating point operations are + converted to function calls */ + if ((IS_CONDITIONAL (ic) || + IS_ARITHMETIC_OP (ic)) && + (IS_FLOAT (operandType (IC_RIGHT (ic))) || + IS_FIXED( operandType (IC_RIGHT (ic))))) + { + cnvToFcall (ic, ebbs[i]); + } + + /* casting is a little different */ + if (ic->op == CAST) + { + if (IS_FLOAT (operandType (IC_RIGHT (ic)))) + cnvFromFloatCast (ic, ebbs[i]); + else if (IS_FLOAT (operandType (IC_LEFT (ic)))) + cnvToFloatCast (ic, ebbs[i]); + if (IS_FIXED16X16 (operandType (IC_RIGHT (ic)))) + cnvFromFixed16x16Cast (ic, ebbs[i]); + else if (IS_FIXED16X16 (operandType (IC_LEFT (ic)))) + cnvToFixed16x16Cast (ic, ebbs[i]); + } + + // Easy special case which avoids function call: modulo by a literal power + // of two can be replaced by a bitwise AND. + if (ic->op == '%' && isOperandLiteral(IC_RIGHT(ic)) && + IS_UNSIGNED(operandType(IC_LEFT(ic)))) + { + unsigned litVal = abs((unsigned) double2ul (operandLitValue(IC_RIGHT(ic)))); + + /* modulo by 1: no remainder */ + if (litVal == 1) + { + ic->op = '='; + IC_RIGHT (ic) = operandFromLit(0); + IC_LEFT (ic) = NULL; + continue; + } + // See if literal value is a power of 2. + while (litVal && !(litVal & 1)) + { + litVal >>= 1; + } + if (litVal) + { + // discard lowest set bit. + litVal >>= 1; + } + + if (!litVal) + { + ic->op = BITWISEAND; + IC_RIGHT(ic) = operandFromLit(operandLitValue(IC_RIGHT(ic)) - 1); + continue; + } + } + + /* if long / int mult or divide or mod */ + if (ic->op == '*' || ic->op == '/' || ic->op == '%') + { + sym_link *leftType = operandType (IC_LEFT (ic)); + + if (IS_INTEGRAL (leftType) && getSize (leftType) > port->support.muldiv) + { + sym_link *rightType = operandType (IC_RIGHT (ic)); + + if (port->hasNativeMulFor != NULL && + port->hasNativeMulFor (ic, leftType, rightType)) + { + /* Leave as native */ + } + else + { + convilong (ic, ebbs[i]); + } + } + } + + if (ic->op == RRC || ic->op == RLC || ic->op == LEFT_OP || ic->op == RIGHT_OP) + { + sym_link *type = operandType (IC_LEFT (ic)); + + if (IS_INTEGRAL (type) && getSize (type) > port->support.shift && port->support.shift >= 0) + { + convilong (ic, ebbs[i]); + } + } + } } } +/*-----------------------------------------------------------------*/ +/* isLocalWithoutDef - return 1 if sym might be used without a */ +/* defining iCode */ +/*-----------------------------------------------------------------*/ +static int +isLocalWithoutDef (symbol * sym) +{ + if (!IS_AUTO (sym)) + return 0; + + if (IS_VOLATILE (sym->type)) + return 0; + + if (sym->_isparm) + return 0; + + if (IS_AGGREGATE (sym->type)) + return 0; + + if (sym->addrtaken) + return 0; + + return !sym->defs; +} + /*-----------------------------------------------------------------*/ /* replaceRegEqv - replace all local variables with their reqv */ /*-----------------------------------------------------------------*/ -static void replaceRegEqv ( eBBlock **ebbs, int count) +static void +replaceRegEqv (ebbIndex * ebbi) +{ + eBBlock ** ebbs = ebbi->bbOrder; + int count = ebbi->count; + int i; + + /* Update the symbols' def bitvector so we know if there is */ + /* a defining iCode or not. Only replace a local variable */ + /* with its register equivalent if there is a defining iCode; */ + /* otherwise, the port's register allocater may choke. */ + cseAllBlocks (ebbi, TRUE); + + for (i = 0; i < count; i++) + { + + iCode *ic; + + for (ic = ebbs[i]->sch; ic; ic = ic->next) + { + + if (SKIP_IC2 (ic)) + continue; + + if (ic->op == IFX) + { + if (IC_COND (ic) && + IS_TRUE_SYMOP (IC_COND (ic)) && + isLocalWithoutDef (OP_SYMBOL (IC_COND (ic)))) + { + werrorfl (ic->filename, ic->lineno, + W_LOCAL_NOINIT, + OP_SYMBOL (IC_COND (ic))->name); + OP_REQV (IC_COND (ic)) = NULL; + OP_SYMBOL (IC_COND (ic))->allocreq = 1; + } + + if (IS_TRUE_SYMOP (IC_COND (ic)) && + OP_REQV (IC_COND (ic))) + IC_COND (ic) = opFromOpWithDU (OP_REQV (IC_COND (ic)), + OP_SYMBOL (IC_COND (ic))->defs, + OP_SYMBOL (IC_COND (ic))->uses); + + continue; + } + + + if (ic->op == JUMPTABLE) + { + if (IC_JTCOND (ic) && + IS_TRUE_SYMOP (IC_JTCOND (ic)) && + isLocalWithoutDef (OP_SYMBOL (IC_JTCOND (ic)))) + { + werrorfl (ic->filename, ic->lineno, + W_LOCAL_NOINIT, + OP_SYMBOL (IC_JTCOND (ic))->name); + OP_REQV (IC_JTCOND (ic)) = NULL; + OP_SYMBOL (IC_JTCOND (ic))->allocreq = 1; + } + + if (IS_TRUE_SYMOP (IC_JTCOND (ic)) && + OP_REQV (IC_JTCOND (ic))) + IC_JTCOND (ic) = opFromOpWithDU (OP_REQV (IC_JTCOND (ic)), + OP_SYMBOL (IC_JTCOND (ic))->defs, + OP_SYMBOL (IC_JTCOND (ic))->uses); + continue; + } + + if (ic->op == RECEIVE) + { + if (OP_SYMBOL (IC_RESULT (ic))->addrtaken) + OP_SYMBOL (IC_RESULT (ic))->isspilt = 1; + } + + /* general case */ + if (IC_RESULT (ic) && + IS_TRUE_SYMOP (IC_RESULT (ic)) && + OP_REQV (IC_RESULT (ic))) + { + if (POINTER_SET (ic)) + { + IC_RESULT (ic) = opFromOpWithDU (OP_REQV (IC_RESULT (ic)), + OP_SYMBOL (IC_RESULT (ic))->defs, + OP_SYMBOL (IC_RESULT (ic))->uses); + IC_RESULT (ic)->isaddr = 1; + } + else + IC_RESULT (ic) = opFromOpWithDU (OP_REQV (IC_RESULT (ic)), + OP_SYMBOL (IC_RESULT (ic))->defs, + OP_SYMBOL (IC_RESULT (ic))->uses); + } + + if (IC_RIGHT (ic) && + IS_TRUE_SYMOP (IC_RIGHT (ic)) && + isLocalWithoutDef (OP_SYMBOL (IC_RIGHT (ic)))) + { + werrorfl (ic->filename, ic->lineno, + W_LOCAL_NOINIT, + OP_SYMBOL (IC_RIGHT (ic))->name); + OP_REQV (IC_RIGHT (ic)) = NULL; + OP_SYMBOL (IC_RIGHT (ic))->allocreq = 1; + } + + if (IC_RIGHT (ic) && + IS_TRUE_SYMOP (IC_RIGHT (ic)) && + OP_REQV (IC_RIGHT (ic))) + { + IC_RIGHT (ic) = opFromOpWithDU (OP_REQV (IC_RIGHT (ic)), + OP_SYMBOL (IC_RIGHT (ic))->defs, + OP_SYMBOL (IC_RIGHT (ic))->uses); + IC_RIGHT (ic)->isaddr = 0; + } + + if (IC_LEFT (ic) && + IS_TRUE_SYMOP (IC_LEFT (ic)) && + isLocalWithoutDef (OP_SYMBOL (IC_LEFT (ic)))) + { + werrorfl (ic->filename, ic->lineno, + W_LOCAL_NOINIT, + OP_SYMBOL (IC_LEFT (ic))->name); + OP_REQV (IC_LEFT (ic)) = NULL; + OP_SYMBOL (IC_LEFT (ic))->allocreq = 1; + } + + if (IC_LEFT (ic) && + IS_TRUE_SYMOP (IC_LEFT (ic)) && + OP_REQV (IC_LEFT (ic))) + { + IC_LEFT (ic) = opFromOpWithDU (OP_REQV (IC_LEFT (ic)), + OP_SYMBOL (IC_LEFT (ic))->defs, + OP_SYMBOL (IC_LEFT (ic))->uses); + IC_LEFT (ic)->isaddr = 0; + } + } + } +} + +/*-----------------------------------------------------------------*/ +/* findReqv - search for a register equivalent */ +/*-----------------------------------------------------------------*/ +operand * +findReqv (symbol * prereqv, eBBlock ** ebbs, int count) { - int i; - - for (i = 0 ; i < count ; i++ ) { - - iCode *ic ; - - for (ic = ebbs[i]->sch ; ic ; ic = ic->next) { - - if (SKIP_IC2(ic)) - continue ; - - if (ic->op == IFX) { - - if (IS_TRUE_SYMOP(IC_COND(ic)) && - OP_REQV(IC_COND(ic))) - IC_COND(ic) = opFromOpWithDU(OP_REQV(IC_COND(ic)), - OP_SYMBOL(IC_COND(ic))->defs, - OP_SYMBOL(IC_COND(ic))->uses); - - continue ; - } - - if (ic->op == JUMPTABLE) { - if (IS_TRUE_SYMOP(IC_JTCOND(ic)) && - OP_REQV(IC_JTCOND(ic))) - IC_JTCOND(ic) = opFromOpWithDU(OP_REQV(IC_JTCOND(ic)), - OP_SYMBOL(IC_JTCOND(ic))->defs, - OP_SYMBOL(IC_JTCOND(ic))->uses); - continue ; - } - - if (ic->op == RECEIVE) { - if (OP_SYMBOL(IC_RESULT(ic))->addrtaken) - OP_SYMBOL(IC_RESULT(ic))->isspilt = 1; - } - - /* general case */ - if (IC_RESULT(ic) && - IS_TRUE_SYMOP(IC_RESULT(ic)) && - OP_REQV(IC_RESULT(ic)) ) { - if (POINTER_SET(ic)) { - IC_RESULT(ic) = opFromOpWithDU(OP_REQV(IC_RESULT(ic)), - OP_SYMBOL(IC_RESULT(ic))->defs, - OP_SYMBOL(IC_RESULT(ic))->uses); - IC_RESULT(ic)->isaddr = 1; - } else - IC_RESULT(ic) = opFromOpWithDU(OP_REQV(IC_RESULT(ic)), - OP_SYMBOL(IC_RESULT(ic))->defs, - OP_SYMBOL(IC_RESULT(ic))->uses); - } - - if (IC_RIGHT(ic) && - IS_TRUE_SYMOP(IC_RIGHT(ic)) && - OP_REQV(IC_RIGHT(ic)) ) { - IC_RIGHT(ic) = opFromOpWithDU(OP_REQV(IC_RIGHT(ic)), - OP_SYMBOL(IC_RIGHT(ic))->defs, - OP_SYMBOL(IC_RIGHT(ic))->uses); - IC_RIGHT(ic)->isaddr = 0; - } - - if (IC_LEFT(ic) && - IS_TRUE_SYMOP(IC_LEFT(ic)) && - OP_REQV(IC_LEFT(ic)) ) { - IC_LEFT(ic) = opFromOpWithDU(OP_REQV(IC_LEFT(ic)), - OP_SYMBOL(IC_LEFT(ic))->defs, - OP_SYMBOL(IC_LEFT(ic))->uses); - IC_LEFT(ic)->isaddr = 0; - } - } + int i; + iCode * ic; + + /* for all blocks do */ + for (i=0; isch; ic; ic = ic->next) + { + if (ic->op == IFX) + { + if (IS_ITEMP (IC_COND (ic)) + && OP_SYMBOL (IC_COND (ic))->prereqv == prereqv) + return IC_COND (ic); + } + else if (ic->op == JUMPTABLE) + { + if (IS_ITEMP (IC_JTCOND (ic)) + && OP_SYMBOL (IC_JTCOND (ic))->prereqv == prereqv) + return IC_JTCOND (ic); + } + else + { + if (IS_ITEMP (IC_LEFT (ic)) + && OP_SYMBOL (IC_LEFT (ic))->prereqv == prereqv) + return IC_LEFT (ic); + if (IS_ITEMP (IC_RIGHT (ic)) + && OP_SYMBOL (IC_RIGHT (ic))->prereqv == prereqv) + return IC_RIGHT (ic); + if (IS_ITEMP (IC_RESULT (ic)) + && OP_SYMBOL (IC_RESULT (ic))->prereqv == prereqv) + return IC_RESULT (ic); + } + } } + + return NULL; } /*-----------------------------------------------------------------*/ /* killDeadCode - eliminates dead assignments */ /*-----------------------------------------------------------------*/ -int killDeadCode ( eBBlock **ebbs, int count) +int +killDeadCode (ebbIndex * ebbi) { - int change = 1; - int gchange = 0 ; - int i = 0 ; - - - /* basic algorithm :- */ - /* first the exclusion rules :- */ - /* 1. if result is a global or volatile then skip */ - /* 2. if assignment and result is a temp & isaddr then skip */ - /* since this means array & pointer access, will be taken */ - /* care of by alias analysis. */ - /* 3. if the result is used in the remainder of the block skip*/ - /* 4. if this definition does not reach the end of the block */ - /* i.e. the result is not present in the outExprs then KILL*/ - /* 5. if it reaches the end of block & is used by some success*/ - /* or then skip */ - /* else KILL */ - /* this whole process is carried on iteratively till no change */ - while (1) { - - change = 0 ; - /* for all blocks do */ - for ( i = 0 ; i < count ; i++ ) { - iCode *ic ; - - /* for all instructions in the block do */ - for ( ic = ebbs[i]->sch ; ic ; ic = ic->next ) { - int kill, j ; - kill = 0 ; - - if (SKIP_IC(ic) || - ic->op == IFX || - ic->op == RETURN ) - continue ; - - /* if the result is volatile then continue */ - if (IC_RESULT(ic) && isOperandVolatile(IC_RESULT(ic),FALSE)) - continue ; - - /* if the result is a temp & isaddr then skip */ - if (IC_RESULT(ic) && POINTER_SET(ic)) - continue ; - - /* if the result is used in the remainder of the */ - /* block then skip */ - if (usedInRemaining (IC_RESULT(ic),ic->next)) - continue ; - - /* does this definition reach the end of the block - or the usage is zero then we can kill */ - if (! bitVectBitValue(ebbs[i]->outDefs,ic->key)) - kill = 1; /* if not we can kill it */ - else { - /* if this is a global variable or function parameter */ - /* we cannot kill anyway */ - if (isOperandGlobal(IC_RESULT(ic)) || - (OP_SYMBOL(IC_RESULT(ic))->_isparm && - !OP_SYMBOL(IC_RESULT(ic))->ismyparm)) - continue ; - - /* if we are sure there are no usages */ - if (bitVectIsZero(OP_USES(IC_RESULT(ic)))) { - kill = 1 ; - goto kill ; - } - - /* reset visited flag */ - for(j=0; j < count ; ebbs[j++]->visited = 0); - - /* find out if this definition is alive */ - if ( applyToSet (ebbs[i]->succList, - isDefAlive, - ic)) - continue ; - - kill = 1; - } - - kill : - /* kill this one if required */ - if (kill) { - change = 1; - gchange++ ; - /* eliminate this */ - remiCodeFromeBBlock(ebbs[i],ic); - - /* now delete from defUseSet */ - deleteItemIf (&ebbs[i]->outExprs,ifDiCodeIsX,ic); - bitVectUnSetBit (ebbs[i]->outDefs,ic->key); - - /* and defset of the block */ - bitVectUnSetBit (ebbs[i]->defSet,ic->key); - - /* for the left & right remove the usage */ - if (IS_SYMOP(IC_LEFT(ic))) - bitVectUnSetBit(OP_USES(IC_LEFT(ic)),ic->key); - - if (IS_SYMOP(IC_RIGHT(ic))) - bitVectUnSetBit(OP_USES(IC_RIGHT(ic)),ic->key); - } - - } /* end of all instructions */ - - if (!ebbs[i]->sch && !ebbs[i]->noPath) - disconBBlock(ebbs[i],ebbs,count); - - } /* end of for all blocks */ - - if (!change) - break; - } /* end of while(1) */ - - return gchange ; + eBBlock ** ebbs = ebbi->dfOrder; + int count = ebbi->count; + int change = 1; + int gchange = 0; + int i = 0; + + + /* basic algorithm :- */ + /* first the exclusion rules :- */ + /* 1. if result is a global or volatile then skip */ + /* 2. if assignment and result is a temp & isaddr then skip */ + /* since this means array & pointer access, will be taken */ + /* care of by alias analysis. */ + /* 3. if the result is used in the remainder of the block skip */ + /* 4. if this definition does not reach the end of the block */ + /* i.e. the result is not present in the outExprs then KILL */ + /* 5. if it reaches the end of block & is used by some success */ + /* or then skip */ + /* else KILL */ + /* this whole process is carried on iteratively till no change */ + while (1) + { + + change = 0; + /* for all blocks do */ + for (i = 0; i < count; i++) + { + iCode *ic; + + /* for all instructions in the block do */ + for (ic = ebbs[i]->sch; ic; ic = ic->next) + { + int kill, j; + kill = 0; + + if (SKIP_IC (ic) || + ic->op == IFX || + ic->op == RETURN || + ic->op == DUMMY_READ_VOLATILE || + ic->op == CRITICAL || + ic->op == ENDCRITICAL) + continue; + + /* Since both IFX & JUMPTABLE (in SKIP_IC) have been tested for */ + /* it is now safe to assume IC_LEFT, IC_RIGHT, & IC_RESULT are */ + /* valid. */ + + /* if the result is volatile then continue */ + if (IC_RESULT (ic) && isOperandVolatile (IC_RESULT (ic), FALSE)) + continue; + + /* if the result is a temp & isaddr then skip */ + if (IC_RESULT (ic) && POINTER_SET (ic)) + continue; + + if (POINTER_GET (ic) && IS_VOLATILE (operandType (IC_LEFT (ic))->next) + && !SPIL_LOC (IC_RESULT (ic))) + continue; + + /* if the result is used in the remainder of the */ + /* block then skip */ + if (usedInRemaining (IC_RESULT (ic), ic->next)) + continue; + + /* does this definition reach the end of the block + or the usage is zero then we can kill */ + if (!bitVectBitValue (ebbs[i]->outDefs, ic->key)) + kill = 1; /* if not we can kill it */ + else + { + /* if this is a global variable or function parameter */ + /* we cannot kill anyway */ + if (isOperandGlobal (IC_RESULT (ic)) || + (OP_SYMBOL (IC_RESULT (ic))->_isparm && + !OP_SYMBOL (IC_RESULT (ic))->ismyparm)) + continue; + + /* if we are sure there are no usages */ + if (bitVectIsZero (OP_USES (IC_RESULT (ic)))) + { + kill = 1; + goto kill; + } + + /* reset visited flag */ + for (j = 0; j < count; ebbs[j++]->visited = 0); + + /* find out if this definition is alive */ + if (applyToSet (ebbs[i]->succList, + isDefAlive, + ic)) + continue; + + kill = 1; + } + + kill: + /* kill this one if required */ + if (kill) + { + bool volLeft = IS_SYMOP (IC_LEFT (ic)) + && isOperandVolatile (IC_LEFT (ic), FALSE); + bool volRight = IS_SYMOP (IC_RIGHT (ic)) + && isOperandVolatile (IC_RIGHT (ic), FALSE); + + /* a dead address-of operation should die, even if volatile */ + if (ic->op == ADDRESS_OF) + volLeft = FALSE; + + if (ic->next && ic->seqPoint == ic->next->seqPoint + && (ic->next->op == '+' || ic->next->op == '-')) + { + if (isOperandEqual (IC_LEFT(ic), IC_LEFT(ic->next)) + || isOperandEqual (IC_LEFT(ic), IC_RIGHT(ic->next))) + volLeft = FALSE; + if (isOperandEqual (IC_RIGHT(ic), IC_LEFT(ic->next)) + || isOperandEqual (IC_RIGHT(ic), IC_RIGHT(ic->next))) + volRight = FALSE; + } + + if (POINTER_GET (ic) && IS_VOLATILE (operandType (IC_LEFT (ic))->next)) + { + if (SPIL_LOC (IC_RESULT (ic))) + { + IC_RESULT (ic) = newiTempFromOp (IC_RESULT (ic)); + SPIL_LOC (IC_RESULT (ic)) = NULL; + } + continue; + } + + change = 1; + gchange++; + + /* now delete from defUseSet */ + deleteItemIf (&ebbs[i]->outExprs, ifDiCodeIsX, ic); + bitVectUnSetBit (ebbs[i]->outDefs, ic->key); + + /* and defset of the block */ + bitVectUnSetBit (ebbs[i]->defSet, ic->key); + + /* If this is the last of a register equivalent, */ + /* look for a successor register equivalent. */ + bitVectUnSetBit (OP_DEFS (IC_RESULT (ic)), ic->key); + if (IS_ITEMP (IC_RESULT (ic)) + && OP_SYMBOL (IC_RESULT (ic))->isreqv + && bitVectIsZero (OP_DEFS (IC_RESULT (ic)))) + { + symbol * resultsym = OP_SYMBOL (IC_RESULT (ic)); + symbol * prereqv = resultsym->prereqv; + + if (prereqv && prereqv->reqv && (OP_SYMBOL (prereqv->reqv) == resultsym)) + { + operand * newreqv; + + IC_RESULT (ic) = NULL; + newreqv = findReqv (prereqv, ebbs, count); + if (newreqv) + { + prereqv->reqv = newreqv; + } + } + } + + /* delete the result */ + IC_RESULT (ic) = NULL; + + if (volLeft || volRight) + { + /* something is volatile, so keep the iCode */ + /* and change the operator instead */ + ic->op = DUMMY_READ_VOLATILE; + + /* keep only the volatile operands */ + if (!volLeft) + IC_LEFT (ic) = NULL; + if (!volRight) + IC_RIGHT (ic) = NULL; + } + else + { + /* nothing is volatile, eliminate the iCode */ + remiCodeFromeBBlock (ebbs[i], ic); + + /* for the left & right remove the usage */ + if (IS_SYMOP (IC_LEFT (ic))) + bitVectUnSetBit (OP_USES (IC_LEFT (ic)), ic->key); + + if (IS_SYMOP (IC_RIGHT (ic))) + bitVectUnSetBit (OP_USES (IC_RIGHT (ic)), ic->key); + } + } + + } /* end of all instructions */ + + if (!ebbs[i]->sch && !ebbs[i]->noPath) + disconBBlock (ebbs[i], ebbi); + + } /* end of for all blocks */ + + if (!change) + break; + } /* end of while(1) */ + + return gchange; } /*-----------------------------------------------------------------*/ /* printCyclomatic - prints the cyclomatic information */ /*-----------------------------------------------------------------*/ -static void printCyclomatic (eBBlock **ebbs, int count) +static void +printCyclomatic (eBBlock ** ebbs, int count) { - int nEdges = elementsInSet(graphEdges); - int i, nNodes =0; + int nEdges = elementsInSet (graphEdges); + int i, nNodes = 0; - for (i = 0 ; i < count ; i++) - nNodes += (! ebbs[i]->noPath); + for (i = 0; i < count; i++) + nNodes += (!ebbs[i]->noPath); - /* print the information */ - werror(I_CYCLOMATIC,currFunc->name,nEdges,nNodes, nEdges - nNodes + 2); + /* print the information */ + werror (I_CYCLOMATIC, currFunc->name, nEdges, nNodes, nEdges - nNodes + 2); } /*-----------------------------------------------------------------*/ /* discardDeadParamReceives - remove any RECEIVE opcodes which */ -/* refer to dead variables. */ +/* refer to dead variables. */ /*-----------------------------------------------------------------*/ -static void discardDeadParamReceives(eBBlock **ebbs, int count) +static void +discardDeadParamReceives (eBBlock ** ebbs, int count) { - int i; - iCode *ic; - iCode dummyIcode; + int i; + iCode *ic; + iCode dummyIcode; - for (i = 0 ; i < count ; i++) + for (i = 0; i < count; i++) + { + for (ic = ebbs[i]->sch; ic; ic = ic->next) + { + if (ic->op == RECEIVE) + { + if (IC_RESULT (ic) && OP_SYMBOL (IC_RESULT (ic)) + && !OP_SYMBOL (IC_RESULT (ic))->used) + { +#if 0 + fprintf (stderr, "discarding dead receive for %s\n", + OP_SYMBOL (IC_RESULT (ic))->name); +#endif + dummyIcode.next = ic->next; + remiCodeFromeBBlock (ebbs[i], ic); + ic = &dummyIcode; + } + } + } + } +} + +/*-----------------------------------------------------------------*/ +/* optimizeCastCast - remove unneeded intermediate casts. */ +/* Integer promotion may cast (un)signed char to int and then */ +/* recast the int to (un)signed long. If the signedness of the */ +/* char and long are the same, the cast can be safely performed in */ +/* a single step. */ +/*-----------------------------------------------------------------*/ +static void +optimizeCastCast (eBBlock ** ebbs, int count) +{ + int i; + iCode *ic; + iCode *uic; + sym_link * type1; + sym_link * type2; + sym_link * type3; + symbol * sym; + + for (i = 0; i < count; i++) { - for ( ic = ebbs[i]->sch ; ic ; ic = ic->next ) + for (ic = ebbs[i]->sch; ic; ic = ic->next) { - if (ic->op == RECEIVE) + + if (ic->op == CAST && IC_RESULT (ic) && IS_ITEMP (IC_RESULT (ic))) { - if (IC_RESULT(ic) && OP_SYMBOL(IC_RESULT(ic)) - && !OP_SYMBOL(IC_RESULT(ic))->used) - { -#if 0 - fprintf(stderr, "discarding dead receive for %s\n", - OP_SYMBOL(IC_RESULT(ic))->name); -#endif - dummyIcode.next = ic->next; - remiCodeFromeBBlock(ebbs[i], ic); - ic = &dummyIcode; - } + type1 = operandType (IC_RIGHT (ic)); + type2 = operandType (IC_RESULT (ic)); + + /* Look only for a cast from an integer type to an */ + /* integer type that has no loss of bits */ + if (!IS_INTEGRAL (type1) || !IS_INTEGRAL (type2)) + continue; + if (getSize (type2) < getSize (type1)) + continue; + + /* There must be only one use of this first result */ + if (bitVectnBitsOn (OP_USES (IC_RESULT (ic))) != 1) + continue; + + /* This use must be a second cast */ + uic = hTabItemWithKey (iCodehTab, + bitVectFirstBit (OP_USES (IC_RESULT (ic)))); + if (!uic || uic->op != CAST) + continue; + + /* It must be a cast to another integer type that */ + /* has no loss of bits */ + type3 = operandType (IC_RESULT (uic)); + if (!IS_INTEGRAL (type3)) + continue; + if (getSize (type3) < getSize (type2)) + continue; + + /* The signedness between the first and last types */ + /* must match */ + if (SPEC_USIGN (type3) != SPEC_USIGN (type1)) + continue; + + /* Change the first cast to a simple assignment and */ + /* let the second cast do all the work */ + ic->op = '='; + IC_LEFT (ic) = NULL; + sym = OP_SYMBOL (IC_RESULT (ic)); + sym->type = copyLinkChain (type1); + sym->etype = getSpec (sym->type); } } } @@ -649,144 +1479,170 @@ static void discardDeadParamReceives(eBBlock **ebbs, int count) /* eBBlockFromiCode - creates extended basic blocks from iCode */ /* will return an array of eBBlock pointers */ /*-----------------------------------------------------------------*/ -eBBlock **eBBlockFromiCode (iCode *ic) -{ - eBBlock **ebbs = NULL ; - int count = 0; - int saveCount = 0 ; - int change = 1; - int lchange = 0 ; - int kchange = 0; - hTab *loops ; - - /* if nothing passed then return nothing */ - if (!ic) - return NULL ; - - count = 0; - eBBNum = 0; - - /* optimize the chain for labels & gotos - this will eliminate redundant labels and - will change jump to jumps by jumps */ - ic = iCodeLabelOptimize (ic); - - /* break it down into basic blocks */ - ebbs = iCodeBreakDown (ic,&count); - saveCount = count ; - - /* compute the control flow */ - computeControlFlow (ebbs,count,0); - - /* dumpraw if asked for */ - if (options.dump_raw) - dumpEbbsToFileExt(".dumpraw0",ebbs,count); - - /* replace the local variables with their - register equivalents : the liveRange computation - along with the register allocation will determine - if it finally stays in the registers */ - replaceRegEqv (ebbs,count); - - /* create loop regions */ - loops = createLoopRegions (ebbs,count); - - /* dumpraw if asked for */ - if (options.dump_raw) - dumpEbbsToFileExt(".dumpraw1",ebbs,count); - - /* do common subexpression elimination for each block */ - change = cseAllBlocks(ebbs,saveCount); - - /* dumpraw if asked for */ - if (options.dump_raw) - dumpEbbsToFileExt(".dumpcse",ebbs,count); - - /* compute the data flow */ - computeDataFlow (ebbs,saveCount); - - /* dumpraw if asked for */ - if (options.dump_raw) - dumpEbbsToFileExt(".dumpdflow",ebbs,count); - - /* global common subexpression elimination */ - if ( optimize.global_cse ) { - change += cseAllBlocks(ebbs,saveCount); - if (options.dump_gcse) - dumpEbbsToFileExt(".dumpgcse",ebbs,saveCount); +eBBlock ** +eBBlockFromiCode (iCode * ic) +{ + ebbIndex *ebbi = NULL; + int change = 1; + int lchange = 0; + int kchange = 0; + hTab *loops; + + /* if nothing passed then return nothing */ + if (!ic) + return NULL; + + eBBNum = 0; + + /* optimize the chain for labels & gotos + this will eliminate redundant labels and + will change jump to jumps by jumps */ + ic = iCodeLabelOptimize (ic); + + /* break it down into basic blocks */ + ebbi = iCodeBreakDown (ic); + + /* hash the iCode keys so that we can quickly index */ + /* them in the rest of the optimization steps */ + setToNull ((void *) &iCodehTab); + iCodehTab = newHashTable (iCodeKey); + hashiCodeKeys (ebbi->bbOrder, ebbi->count); + + /* compute the control flow */ + computeControlFlow (ebbi); + + /* dumpraw if asked for */ + if (options.dump_raw) + dumpEbbsToFileExt (DUMP_RAW0, ebbi); + + /* replace the local variables with their + register equivalents : the liveRange computation + along with the register allocation will determine + if it finally stays in the registers */ + replaceRegEqv (ebbi); + + /* create loop regions */ + loops = createLoopRegions (ebbi); + + /* dumpraw if asked for */ + if (options.dump_raw) + dumpEbbsToFileExt (DUMP_RAW1, ebbi); + + optimizeCastCast (ebbi->bbOrder, ebbi->count); + + /* do common subexpression elimination for each block */ + change = cseAllBlocks (ebbi, FALSE); + + /* dumpraw if asked for */ + if (options.dump_raw) + dumpEbbsToFileExt (DUMP_CSE, ebbi); + + /* compute the data flow */ + computeDataFlow (ebbi); + + /* dumpraw if asked for */ + if (options.dump_raw) + dumpEbbsToFileExt (DUMP_DFLOW, ebbi); + + /* global common subexpression elimination */ + if (optimize.global_cse) + { + change += cseAllBlocks (ebbi, FALSE); + if (options.dump_gcse) + dumpEbbsToFileExt (DUMP_GCSE, ebbi); } - /* kill dead code */ - kchange = killDeadCode (ebbs, saveCount); - - if (options.dump_kill) - dumpEbbsToFileExt(".dumpdeadcode",ebbs,count); - - /* do loop optimizations */ - change += (lchange = loopOptimizations (loops,ebbs,count)); - if (options.dump_loop) - dumpEbbsToFileExt(".dumploop",ebbs,count); - - /* recompute the data flow and apply global cse again - if loops optimizations or dead code caused a change: - loops will brings out of the loop which then may be - available for use in the later blocks: dead code - elimination could potentially disconnect some blocks - conditional flow may be efected so we need to apply - subexpression once more */ - if ( lchange || kchange ) { - - computeDataFlow (ebbs,saveCount); - change += cseAllBlocks(ebbs,saveCount); - if (options.dump_loop) - dumpEbbsToFileExt(".dumploopg",ebbs,count); - - /* if loop optimizations caused a change then do - dead code elimination once more : this will - get rid of the extra assignments to the induction - variables created during loop optimizations */ - killDeadCode (ebbs, saveCount); - - if (options.dump_loop) - dumpEbbsToFileExt(".dumploopd",ebbs,count); - - } - - - /* sort it back by block number */ - qsort (ebbs,saveCount,sizeof(eBBlock *),bbNumCompare); - - /* if cyclomatic info requested then print it */ - if (options.cyclomatic) - printCyclomatic(ebbs,saveCount); - - - /* convert operations with support routines - written in C to function calls : Iam doing - this at this point since I want all the - operations to be as they are for optimzations */ - convertToFcall (ebbs,count); - - - /* compute the live ranges */ - computeLiveRanges (ebbs,count); - - if (options.dump_range) - dumpEbbsToFileExt(".dumprange",ebbs,count); - - /* Now that we have the live ranges, discard parameter - * receives for unused parameters. - */ - discardDeadParamReceives(ebbs,count); - - /* allocate registers & generate code */ - port->assignRegisters(ebbs,count); - - /* throw away blocks */ - setToNull ((void **)&graphEdges); - ebbs = NULL ; + else + { + // compute the dataflow only + assert(cseAllBlocks (ebbi, TRUE)==0); + } + /* kill dead code */ + kchange = killDeadCode (ebbi); + + if (options.dump_kill) + dumpEbbsToFileExt (DUMP_DEADCODE, ebbi); + + /* do loop optimizations */ + change += (lchange = loopOptimizations (loops, ebbi)); + if (options.dump_loop) + dumpEbbsToFileExt (DUMP_LOOP, ebbi); + + /* recompute the data flow and apply global cse again + if loops optimizations or dead code caused a change: + loops will brings out of the loop which then may be + available for use in the later blocks: dead code + elimination could potentially disconnect some blocks + conditional flow may be efected so we need to apply + subexpression once more */ + if (lchange || kchange) + { + computeDataFlow (ebbi); + change += cseAllBlocks (ebbi, FALSE); + if (options.dump_loop) + dumpEbbsToFileExt (DUMP_LOOPG, ebbi); + /* if loop optimizations caused a change then do + dead code elimination once more : this will + get rid of the extra assignments to the induction + variables created during loop optimizations */ + killDeadCode (ebbi); - return NULL; + if (options.dump_loop) + dumpEbbsToFileExt (DUMP_LOOPD, ebbi); + + } + + /* sort it back by block number */ + //qsort (ebbs, saveCount, sizeof (eBBlock *), bbNumCompare); + + if (!options.lessPedantic) { + // this is a good place to check missing return values + if (currFunc) { + // the user is on his own with naked functions... + if (!IS_VOID(currFunc->etype) + && !FUNC_ISNAKED(currFunc->type)) { + eBBlock *bp; + // make sure all predecessors of the last block end in a return + for (bp=setFirstItem(ebbi->bbOrder[ebbi->count-1]->predList); + bp; + bp=setNextItem(ebbi->bbOrder[ebbi->count-1]->predList)) { + if (bp->ech->op != RETURN) { + werrorfl (bp->ech->filename, bp->ech->lineno, + W_VOID_FUNC, currFunc->name); + } + } + } + } + } + + /* if cyclomatic info requested then print it */ + if (options.cyclomatic) + printCyclomatic (ebbi->bbOrder, ebbi->count); + + /* convert operations with support routines + written in C to function calls : I am doing + this at this point since I want all the + operations to be as they are for optimizations */ + convertToFcall (ebbi->bbOrder, ebbi->count); + + /* compute the live ranges */ + computeLiveRanges (ebbi->bbOrder, ebbi->count, TRUE); + + if (options.dump_range) + dumpEbbsToFileExt (DUMP_RANGE, ebbi); + + /* Now that we have the live ranges, discard parameter + * receives for unused parameters. + */ + discardDeadParamReceives (ebbi->bbOrder, ebbi->count); + + /* allocate registers & generate code */ + port->assignRegisters (ebbi); + + /* throw away blocks */ + setToNull ((void *) &graphEdges); + + return NULL; }