X-Git-Url: https://git.gag.com/?a=blobdiff_plain;f=src%2FSDCCopt.c;h=c799bed2de0d887594170d6d07572d85bd821638;hb=HEAD;hp=345f8484bbe3afd793d5d4a7c325a0f6ceb128e6;hpb=ed70c6e0de82527c2ee28c9c52a5eaf1b8f51650;p=fw%2Fsdcc diff --git a/src/SDCCopt.c b/src/SDCCopt.c index 345f8484..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) @@ -11,21 +11,22 @@ 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" /*-----------------------------------------------------------------*/ @@ -38,7 +39,7 @@ char flowChanged = 0; /*-----------------------------------------------------------------*/ /* printSymName - prints the symbol names */ /*-----------------------------------------------------------------*/ -int +int printSymName (void *vsym) { symbol *sym = vsym; @@ -49,7 +50,7 @@ printSymName (void *vsym) /*-----------------------------------------------------------------*/ /* cnvToFcall - does the actual conversion to function call */ /*-----------------------------------------------------------------*/ -static void +static void cnvToFcall (iCode * ic, eBBlock * ebp) { iCode *ip; @@ -57,49 +58,93 @@ cnvToFcall (iCode * ic, eBBlock * ebp) operand *left; operand *right; symbol *func = NULL; + char *filename = ic->filename; int lineno = ic->lineno; int bytesPushed=0; - ip = ic->next; /* insertion point */ + 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; - } + 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) @@ -107,32 +152,38 @@ cnvToFcall (iCode * ic, eBBlock * ebp) /* 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); - } + { + newic = newiCode (SEND, left, 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)); - } + { + 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, IC_RIGHT (ic), NULL); - newic->argreg = SPEC_ARGREG(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, IC_RIGHT (ic)); - IC_RESULT (newic) = operandFromValue (FUNC_ARGS(func->type)->next); - } + { + 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 @@ -140,49 +191,74 @@ cnvToFcall (iCode * ic, eBBlock * ebp) /* 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); - } + { + 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+=4; - bytesPushed += getSize(operandType(right)); - } + { + 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); - } + { + newic = newiCode (SEND, left, NULL); + newic->argreg = SPEC_ARGREG(FUNC_ARGS(func->type)->etype); + } else - { - newic = newiCode (IPUSH, left, NULL); - newic->parmPush = 1; - //bytesPushed+=4; - bytesPushed += getSize(operandType(left)); - } + { + 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); + } /* 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; + 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 +static void cnvToFloatCast (iCode * ic, eBBlock * ebp) { iCode *ip, *newic; @@ -199,14 +275,20 @@ cnvToFloatCast (iCode * ic, eBBlock * ebp) 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; - } - } + { + if (compareType (type, __multypes[bwd][su]) == 1) + { + func = __conv[0][bwd][su]; + goto found; + } + } } + + if(compareType (type, fixed16x16Type) == 1) { + func = __fp16x16conv[0][3][0]; + goto found; + } + assert (0); found: @@ -214,56 +296,169 @@ found: 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); - } + 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)); - } + { + 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); - } + 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))); - } + { + 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; +} + +/*----------------------------------------------------------------------*/ +/* 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 +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; @@ -276,13 +471,13 @@ cnvFromFloatCast (iCode * ic, eBBlock * ebp) 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; - } - } + { + if (compareType (type, __multypes[bwd][su]) == 1) + { + func = __conv[1][bwd][su]; + goto found; + } + } } assert (0); found: @@ -291,16 +486,17 @@ found: 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); - } + 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)); - } + { + newic = newiCode ('=', NULL, IC_RIGHT (ic)); + IC_RESULT (newic) = operandFromValue (FUNC_ARGS(func->type)); + } addiCodeToeBBlock (ebp, newic, ip); + newic->filename = filename; newic->lineno = lineno; } @@ -308,17 +504,18 @@ found: { /* 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); - } + 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))); - } + { + 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; } @@ -327,9 +524,128 @@ found: 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 = 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(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; } extern operand *geniCodeRValue (operand *, bool); @@ -337,71 +653,79 @@ 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) +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; + } + } + } - // Easy special case which avoids function call: modulo by a literal power - // of two can be replaced by a bitwise AND. - if (op == '%' && isOperandLiteral(IC_RIGHT(ic))) - { - unsigned litVal = (unsigned)(operandLitValue(IC_RIGHT(ic))); - - // See if literal value is a power of 2. - while (litVal && !(litVal & 1)) - { - litVal >>= 1; - } - if (litVal) - { - // discard first high bit set. - litVal >>= 1; - } - - if (!litVal) - { - ic->op = BITWISEAND; - IC_RIGHT(ic) = operandFromLit(operandLitValue(IC_RIGHT(ic)) - 1); - return; - } - } - - 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) - { - if (op == '*') - func = __muldiv[0][bwd][su]; - else if (op == '/') - func = __muldiv[1][bwd][su]; - else if (op == '%') - func = __muldiv[2][bwd][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]; + func = __rlrr[1][bwd][su]; else if (op == RLC) - func = __rlrr[0][bwd][su]; + func = __rlrr[0][bwd][su]; else if (op == RIGHT_OP) - func = __rlrr[1][bwd][su]; + func = __rlrr[1][bwd][su]; else if (op == LEFT_OP) - func = __rlrr[0][bwd][su]; - else - assert (0); - goto found; - } - } + func = __rlrr[0][bwd][su]; + else + assert (0); + goto found; + } + } } assert (0); found: @@ -409,29 +733,31 @@ found: 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); - } + 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)); - } + { + 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); + 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); - } + { + 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; } @@ -442,32 +768,34 @@ found: 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); + newic->argreg = SPEC_ARGREG(FUNC_ARGS(func->type)->next->etype); } else - { - newic = newiCode (IPUSH, IC_RIGHT (ic), NULL); - newic->parmPush = 1; + { + newic = newiCode (IPUSH, IC_RIGHT (ic), NULL); + newic->parmPush = 1; - bytesPushed += getSize(operandType(IC_RIGHT(ic))); - } + 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); + newic->argreg = SPEC_ARGREG(FUNC_ARGS(func->type)->etype); } else - { - newic = newiCode (IPUSH, IC_LEFT (ic), NULL); - newic->parmPush = 1; + { + newic = newiCode (IPUSH, IC_LEFT (ic), NULL); + newic->parmPush = 1; - bytesPushed += getSize(operandType(IC_LEFT(ic))); - } + bytesPushed += getSize(operandType(IC_LEFT(ic))); + } addiCodeToeBBlock (ebp, newic, ip); + newic->filename = filename; newic->lineno = lineno; } @@ -475,15 +803,33 @@ found: /* 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 +static void convertToFcall (eBBlock ** ebbs, int count) { int i; @@ -495,33 +841,71 @@ convertToFcall (eBBlock ** ebbs, int count) /* 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 *leftType = operandType (IC_LEFT (ic)); - - if (IS_INTEGRAL (leftType) && getSize (leftType) > port->support.muldiv) + { + + /* 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)); @@ -532,118 +916,242 @@ convertToFcall (eBBlock ** ebbs, int count) } else { - convilong (ic, ebbs[i], leftType, ic->op); + 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)); + sym_link *type = operandType (IC_LEFT (ic)); - if (IS_INTEGRAL (type) && getSize (type) > port->support.shift && port->support.shift >= 0) + if (IS_INTEGRAL (type) && getSize (type) > port->support.shift && port->support.shift >= 0) { - convilong (ic, ebbs[i], type, ic->op); + 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 (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; - } - } + { + + 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; + 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) { + eBBlock ** ebbs = ebbi->dfOrder; + int count = ebbi->count; int change = 1; int gchange = 0; int i = 0; @@ -668,103 +1176,182 @@ killDeadCode (eBBlock ** ebbs, int count) 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) - 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 (POINTER_GET (ic) && IS_VOLATILE (operandType (IC_LEFT (ic))->next)) + { + 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; + /* 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); + 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; + } - /* now delete from defUseSet */ - deleteItemIf (&ebbs[i]->outExprs, ifDiCodeIsX, ic); - bitVectUnSetBit (ebbs[i]->outDefs, ic->key); + change = 1; + gchange++; - /* and defset of the block */ - bitVectUnSetBit (ebbs[i]->defSet, ic->key); + /* 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); + /* 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); - } + if (IS_SYMOP (IC_RIGHT (ic))) + bitVectUnSetBit (OP_USES (IC_RIGHT (ic)), ic->key); + } + } - } /* end of all instructions */ + } /* end of all instructions */ - if (!ebbs[i]->sch && !ebbs[i]->noPath) - disconBBlock (ebbs[i], ebbs, count); + if (!ebbs[i]->sch && !ebbs[i]->noPath) + disconBBlock (ebbs[i], ebbi); - } /* end of for all blocks */ + } /* end of for all blocks */ if (!change) - break; - } /* end of while(1) */ + break; + } /* end of while(1) */ return gchange; } @@ -772,7 +1359,7 @@ killDeadCode (eBBlock ** ebbs, int count) /*-----------------------------------------------------------------*/ /* printCyclomatic - prints the cyclomatic information */ /*-----------------------------------------------------------------*/ -static void +static void printCyclomatic (eBBlock ** ebbs, int count) { int nEdges = elementsInSet (graphEdges); @@ -789,7 +1376,7 @@ printCyclomatic (eBBlock ** ebbs, int count) /* discardDeadParamReceives - remove any RECEIVE opcodes which */ /* refer to dead variables. */ /*-----------------------------------------------------------------*/ -static void +static void discardDeadParamReceives (eBBlock ** ebbs, int count) { int i; @@ -799,22 +1386,92 @@ discardDeadParamReceives (eBBlock ** ebbs, int count) 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 (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); + 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; - } - } - } + 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) + { + + if (ic->op == CAST && IC_RESULT (ic) && IS_ITEMP (IC_RESULT (ic))) + { + 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); + } + } } } @@ -825,9 +1482,7 @@ discardDeadParamReceives (eBBlock ** ebbs, int count) eBBlock ** eBBlockFromiCode (iCode * ic) { - eBBlock **ebbs = NULL; - int count = 0; - int saveCount = 0; + ebbIndex *ebbi = NULL; int change = 1; int lchange = 0; int kchange = 0; @@ -837,76 +1492,82 @@ eBBlockFromiCode (iCode * ic) if (!ic) return NULL; - count = 0; eBBNum = 0; - /* optimize the chain for labels & gotos + /* 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; + 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 (ebbs, count, 0); + computeControlFlow (ebbi); /* dumpraw if asked for */ if (options.dump_raw) - dumpEbbsToFileExt (DUMP_RAW0, ebbs, count); + 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 (ebbs, count); + replaceRegEqv (ebbi); /* create loop regions */ - loops = createLoopRegions (ebbs, count); + loops = createLoopRegions (ebbi); /* dumpraw if asked for */ if (options.dump_raw) - dumpEbbsToFileExt (DUMP_RAW1, ebbs, count); + dumpEbbsToFileExt (DUMP_RAW1, ebbi); + + optimizeCastCast (ebbi->bbOrder, ebbi->count); /* do common subexpression elimination for each block */ - change = cseAllBlocks (ebbs, saveCount, FALSE); + change = cseAllBlocks (ebbi, FALSE); /* dumpraw if asked for */ if (options.dump_raw) - dumpEbbsToFileExt (DUMP_CSE, ebbs, count); + dumpEbbsToFileExt (DUMP_CSE, ebbi); /* compute the data flow */ - computeDataFlow (ebbs, saveCount); + computeDataFlow (ebbi); /* dumpraw if asked for */ if (options.dump_raw) - dumpEbbsToFileExt (DUMP_DFLOW, ebbs, count); + dumpEbbsToFileExt (DUMP_DFLOW, ebbi); /* global common subexpression elimination */ if (optimize.global_cse) { - change += cseAllBlocks (ebbs, saveCount, FALSE); + change += cseAllBlocks (ebbi, FALSE); if (options.dump_gcse) - dumpEbbsToFileExt (DUMP_GCSE, ebbs, saveCount); + dumpEbbsToFileExt (DUMP_GCSE, ebbi); } else { // compute the dataflow only - assert(cseAllBlocks (ebbs, saveCount, TRUE)==0); + assert(cseAllBlocks (ebbi, TRUE)==0); } /* kill dead code */ - kchange = killDeadCode (ebbs, saveCount); + kchange = killDeadCode (ebbi); if (options.dump_kill) - dumpEbbsToFileExt (DUMP_DEADCODE, ebbs, count); + dumpEbbsToFileExt (DUMP_DEADCODE, ebbi); /* do loop optimizations */ - change += (lchange = loopOptimizations (loops, ebbs, count)); + change += (lchange = loopOptimizations (loops, ebbi)); if (options.dump_loop) - dumpEbbsToFileExt (DUMP_LOOP, ebbs, count); + dumpEbbsToFileExt (DUMP_LOOP, ebbi); - /* recompute the data flow and apply global cse again + /* 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 @@ -915,24 +1576,24 @@ eBBlockFromiCode (iCode * ic) subexpression once more */ if (lchange || kchange) { - computeDataFlow (ebbs, saveCount); - change += cseAllBlocks (ebbs, saveCount, FALSE); + computeDataFlow (ebbi); + change += cseAllBlocks (ebbi, FALSE); if (options.dump_loop) - dumpEbbsToFileExt (DUMP_LOOPG, ebbs, count); + 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 (ebbs, saveCount); + killDeadCode (ebbi); if (options.dump_loop) - dumpEbbsToFileExt (DUMP_LOOPD, ebbs, count); + dumpEbbsToFileExt (DUMP_LOOPD, ebbi); } /* sort it back by block number */ - qsort (ebbs, saveCount, sizeof (eBBlock *), bbNumCompare); + //qsort (ebbs, saveCount, sizeof (eBBlock *), bbNumCompare); if (!options.lessPedantic) { // this is a good place to check missing return values @@ -940,47 +1601,47 @@ eBBlockFromiCode (iCode * ic) // 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(ebbs[saveCount-1]->predList); - bp; - bp=setNextItem(ebbs[saveCount-1]->predList)) { - if (bp->ech->op != RETURN) { - werror (W_VOID_FUNC, currFunc->name); - } - } + 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 (ebbs, saveCount); + printCyclomatic (ebbi->bbOrder, ebbi->count); /* convert operations with support routines - written in C to function calls : Iam doing + 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 optimzations */ - convertToFcall (ebbs, count); + operations to be as they are for optimizations */ + convertToFcall (ebbi->bbOrder, ebbi->count); /* compute the live ranges */ - computeLiveRanges (ebbs, count); + computeLiveRanges (ebbi->bbOrder, ebbi->count, TRUE); if (options.dump_range) - dumpEbbsToFileExt (DUMP_RANGE, ebbs, count); + dumpEbbsToFileExt (DUMP_RANGE, ebbi); /* Now that we have the live ranges, discard parameter * receives for unused parameters. */ - discardDeadParamReceives (ebbs, count); + discardDeadParamReceives (ebbi->bbOrder, ebbi->count); /* allocate registers & generate code */ - port->assignRegisters (ebbs, count); + port->assignRegisters (ebbi); /* throw away blocks */ - setToNull ((void **) &graphEdges); - ebbs = NULL; - + setToNull ((void *) &graphEdges); + return NULL; }