* src/SDCC.y: added tokens GETABIT, GETBYTE, GETWORD
* src/SDCCast.c (optimizeGetHbit): updated to also accept bool=expr&(1<<n),
(optimizeGetAbit): new, to get any bit, not only the high bit,
(optimizeGetByte): new, to get a byte from a (long) int: expr>>(8*n),
(optimizeGetWord): new, to get a word from a long int: expr>>(8*n),
(isConformingBody): also check GETABIT, GETBYTE, GETWORD,
(decorateType): '&': also try GETABIT, GETBYTE, GETWORD optimization,
RIGHT_OP: also try GETBYTE, GETWORD optimization,
GETABIT, GETBYTE, GETWORD: decorate them,
(isShiftRightLitVal, isBitAndPowOf2): new helper functions,
(ast_print): added GETABIT, GETBYTE, GETWORD
* src/SDCCcse.c (isSignedOp): added GETABIT, GETBYTE, GETWORD
* src/SDCCicode.c (codeTable): added GETABIT, GETBYTE, GETWORD,
(geniCodeBinary): new generic binary icode,
(ast2iCode): added GETABIT, GETBYTE, GETWORD
* src/port.h: updated comment for PORT.hasExtBitOp
* src/mcs51/gen.c (genGetAbit): new, to get any single bit,
(genGetByte): new, to get a single byte,
(genGetWord): new, to get a word from a long,
(gen51Code): added GETABIT, GETBYTE, GETWORD
* src/mcs51/main.c (hasExtBitOp): added GETABIT, GETBYTE, GETWORD
* configure.in, configure: have device/lib/pic configured
* device/lib/Makefile.in: added model-pic14
* device/lib/clean.mk: added pic/ to clean rule
* device/lib/pic: added rudimentary pic14 library providing support
functions for multiplication/division/generic pointer access
* src/SDCCopt.c (convilong): mark support functions as extern
for pic14 port as well
* src/pic/gen.c (genMult): added assertions,
(genpic14Code): emit warning on unhandled iCodes
* src/pic/main.c (_hasNativeMulFor): return true only for 8x8 bit
* src/pic/pcode.c (pCodeOpCopy),
* src/pic16/pcodepeep.c (pic16_pCodeOpCopy): fixed handling of various
pCodeOpReg-subtypes (PO_{STATUS,INTCON,PCL,PCLATH,PCLATU,BSR,
SFR_REGISTER}), made safe for future extensions
* src/pic16/pcode.c (pic16_safepCodeUnlink): allow for removal of
instructions even if preceeded by SKIP instructions (also remove
them); removed unused code
* src/pic16/pcode.h: added arg2 to pCodeOpLit to match pCodeOpLit2,
prevents leaving parts of the structure uninitialized after copying
* device/include/pic16/pic18f1220.h,
device/lib/pic16/libdev/pic18f1220.c: added ECCPAS sfr and bitfield
* device/lib/pic16/Makefile.rules: added missing opening paren
* src/pic16/gen.c (pic16_genNot,pic16_genCpl): removed as these
are provided in genutils.c,
(genUminusFloat,genUminus,genCmpEq): added asserts on different
operand/result sizes,
(genCmp): assert on NULL pointers first, then check deref'ed values
* src/pic16/genutils.c (pic16_genCpl): fixed for different operand/
result size
* src/pic16/gen.c (genFarPointerGet,genFarPointerSet): removed
as these are now unused,
(genPointerGet,genPointerSet): handle FPOINTERs like POINTERs
* src/pic16/pcode.c (pic16_symIsSpecial): assume REG_TMPs to be
local, avoids uninitialized pointer dereference on r->name
* src/pic16/ralloc.c (newReg): fixed indentation
* .version: changed to version 2.5.3
* doc/sdccman.lyx: changed version to 2.5.3,
documented --codeseg and --constseg and pragma codeseg and constseg,
documented bit parameters (reentrant) and bit returning
* src/SDCCicode.c (geniCodeReceive): fixed (possible) bug generating
currFunc->recvSize, but is this ok for all ports?
(ast2iCode): result of ~ on unsigned char must be cast to int for
bool to work
* src/SDCCmem.c (allocGlobal, allocLocal): don't put bit returning
function pointers in bit space
* src/SDCCsymt.c (checkSClass): allow bit returning function pointers,
(processFuncArgs): call port.reg_parm() with reentrancy info
* src/port.h,
* src/avr/main.c,
* src/ds390/main.c,
* src/hc08/main.c,
* src/pic/main.c,
* src/pic16/main.c,
* src/xa51/main.c,
* src/z80/main.c: port.reg_parm prototype extended with
"bool reentrant" parameter
* src/mcs51/main.c (_mcs51_regparm): use parameter reentrant instead of
options.stackAuto for allocating bit register parameters
* src/mcs51/gen.c (genNot): optimized complementing direct bit,
(genSend): set BitBankUsed if it is,
(selectRegBank): factored out of genCall for use in genPcall,
(genCall): removed redundant dtype assignmen, use selectRegBank,
(genPcall): handle returning in Carry properly, save in F0 if needed,
(genReceive): handle bit register parameters
* src/mcs51/ralloc.c (updateRegUsage): update BitBankUsed along the way,
(mcs51_assignRegisters): enable bit registers for all reentrant
functions and don't set BitBankUsed unconditionally
* src/mcs51/peeph.def (177.d): fixed bug if %2==%3
* support/regression/tests/bitvars.c: enable tests for SDCC_STACK_AUTO
* support/regression/tests/funptrs.c: added tests for BOOL and for return
borutr [Sat, 27 Aug 2005 08:10:02 +0000 (08:10 +0000)]
* device/lib/Makefile.in: cp on sparc-solaris (SunOS) and on ppc-osx (Darwin) does not support -u option. It seems that it is supported only on Linux - GNU cp
sdcc-builder [Thu, 25 Aug 2005 19:25:47 +0000 (19:25 +0000)]
* sim/ucsim/gui.src/serio.src/Makefile.in, sim/ucsim/s51.src/Makefile.in, sim/ucsim/avr.src/Makefile.in, sim/ucsim/z80.src/Makefile.in, sim/ucsim/hc08.src/Makefile.in, sim/ucsim/xa.src/Makefile.in: install -s changed to 2 steps: install and strip, since the strip at /usr/ccs/bin should be used on solaris
maartenbrock [Tue, 23 Aug 2005 18:59:52 +0000 (18:59 +0000)]
* as/mcs51/aslink.h: completed lkrloc.c prototypes
* as/mcs51/lkmain.c (link_main): fixed warning
* device/include/stdbool.h: ds390 has no advanced bit support yet
* src/SDCC.y: use SPEC_SHORT and renamed _signed to b_signed
* src/SDCCsymt.c: use SPEC_SHORT and renamed _signed to b_signed
* src/SDCCsymt.h (struct specifier): renamed _xxx bitfields to b_xxx
and updated their macros
* src/SDCCval.c (constVal): updated comment for renamed b_long
maartenbrock [Mon, 22 Aug 2005 21:00:12 +0000 (21:00 +0000)]
* as/mcs51/asdata.c: changed ctype['['] to BINOP
* as/mcs51/asexpr.c (expr): added case '[' for bit access in bdata,
(term): abused bit 15 of s_addr to indicate bit-addressable bytes,
(oprio): set priority for '['
* as/mcs51/aslink.h: added define R_BIT, and prototypes for adb_bit
and adb_24_bit
* as/mcs51/asm.h: added defines R_BIT and S_BIT
* as/mcs51/lkarea.c (lnksect2): use T for seg BIT_BANK and overlay it
* as/mcs51/lkdata.c: changed ctype['['] to BINOP
* as/mcs51/lkmain.c (Areas51): rel2 contains 12 (=C) areas now,
added overlayable BIT_BANK area
* as/mcs51/lkmem.c (summary): add BIT_BANK to BSEG_BYTES in the report,
(summary2): explain 'T' in legenda
* as/mcs51/lkrloc.c: replaced old K&R style,
(relr): added R_BIT processing,
(errmsg): added "Bit-addressable relocation error",
(adb_bit): added for converting from byte- to bit-addressable space,
(adb_24_bit): added for converting from byte- to bit-addressable space
* device/include/stdbool.h: changed BOOL to __bit for mcs51 as it can be
used in reentrant functions now even as return value
* device/lib/_gptrput.c (_gptrput): removed obsolete code
* src/SDCCast.c (resultTypePropagate): also propagate AND_OP and OR_OP,
(decorateType): case '!', GETHBIT, AND_OP, OR_OP: result in bool or char
* src/SDCCglobl.h: added indicator BitBankUsed
* src/SDCCglue.c (glue): emit area BIT_BANK with byte 'bits' and equ's for
the bit registers b0-b7
* src/SDCCicode.c (operandFromSymbol): removed IS_BITVAR check,
(geniCodeCast): fixed bug 1263853,
(geniCodeLogicAndOr): put result in bool or char,
(geniCodeReceive): added parameter func for accessing the return type,
(geniCodeFunctionBody): pass func to geniCodeReceive
* src/SDCCmain.c: added indicator BitBankUsed
* src/SDCCmem.c (allocLocal): explicitly set sclass for V_BIT
* src/SDCCsymt.c (newBoolLink): added for creating a bool/bit,
(checkSClass): don't put automatic bool/bit on stack,
(checkFunction): removed check on function cannot return bit
* src/SDCCsymt.h: added newBoolLink prototype
* src/mcs51/gen.c (rb1regs): added bit registers,
(movc): created for assigning to carry,
(pushReg, popReg): created for pushing registers,
(sameRegs): check both AOP_REG and AOP_CRY types,
(aopOp): handle bit registers,
(aopPut): optimization no self-assign,
(saveRegisters): push reg->base (bits) only once for bit registers,
and use pushReg,
(unsaveRegisters): pop reg->base only once and use popReg,
(assignResultValue): added parameter func and return in carry for bits,
(genIpush): optimization no reload in A if not changed,
(genSend): bit parameters in reentrant functions are passed in bit
registers by first assigning to bits in B, then save registers and
copy B to bits,
(genCall): handle returning in Carry properly, save it in F0 if needed,
(genPcall): updated assignResultValue call, this is not safe yet for bit
returning function !!!
(genFunction): don't generate equ's for bit registers and use pushReg,
(genEndFunction): take care of bit returning functions and use popReg,
(genRet): return bit in Carry,
(genIfx): optimize bit registers and other directly addressable bits,
(genReceive): updated assignResultValue call
* src/mcs51/main.c (_mcs51_reset_regparm): added regBitParmFlg,
(_mcs51_regparm): allow passing of upto 8 bit parameters in bit
registers when using stack-auto
* src/mcs51/ralloc.c (_G): added allBitregs,
(regs8051): added the bit registers,
(createStackSpil): use macro IS_BIT,
(getRegBit): added to allocate a bit register, else spill,
(getRegBitNoSpil): added to allocate a bit register, else a gpr,
(updateRegUsage): factored out to ease stepping while debugging,
(serialRegAssign): use updateRegUsage, only spill bits if necessary,
also allocate bit registers,
(fillGaps): handle bit registers,
(findAllBitregs): added to create bit vector with all bit registers,
(mcs51_allBitregs): returns this bit vector,
(mcs51_assignRegisters): when using stack-auto use bit registers for
passing parameters and creating local variables
* src/mcs51/ralloc.h: added B0_IDX..B7_IDX and prototype mcs51_allBitregs
borutr [Sat, 20 Aug 2005 18:51:10 +0000 (18:51 +0000)]
* device/lib/Makefile.in: cp on sparc-solaris (SunOS) does not support -u option
* as/Makefile: find on sparc-solaris does not support -maxdepth option
borutr [Sat, 20 Aug 2005 13:00:26 +0000 (13:00 +0000)]
* configure, configure.in: added tests for libsocket and libnsl libraries,
requred by sdcdb on sparc-solaris
* device/lib/pic16/Makefile.common.in: force make to use bash shell
* sim/ucsim/libtool: regenerated on sparc-solaris
* sim/ucsim/avr.src/Makefile.in, sim/ucsim/hc08.src/Makefile.in,
sim/ucsim/s51.src/Makefile.in, sim/ucsim/xa.src/Makefile.in,
sim/ucsim/z80.src/Makefile.in: removed GNU ld specific linker options
-Wl,--start-group and -Wl,--end-group to enable ucsim compilation on
sparc-solaris, which doesn't use GNU ld linker
frief [Tue, 16 Aug 2005 20:59:28 +0000 (20:59 +0000)]
device/lib/_gptrget.c,
device/lib/_gptrput.c: slightly shorter
doc/sdccman.lyx: incremented version
src/mcs51/peeph.def: moved peephole comments to the line of first
change to better keep line correlation, reanimated 186.e src/mcs51/peeph.def: renamed similar peepholes by using suffixes
tecodev [Fri, 12 Aug 2005 11:21:04 +0000 (11:21 +0000)]
* src/pic16/glue.c (pic16_print(G)PointerType): do not flush
db-statements in order to allow for arrays of pointers in code
sections to be placed without interspersed 0-padding, fixes
bug #1256215
* (emitStatistics): fixed division by zero for pic18f1220
* src/pic16/pcode.c: buffer (up to) 12 DB directives to allow for
unpadded writing of 8-bit, 16-bit, 24-bit and 32-bit values
* (pic16_emitDS): respect DB_ITEMS_PER_LINE
* (pic16_pCodeConstString): keep track of already emitted string
literals to prevent "duplicate definitions of symbol _str_NR"
* src/pic16/ralloc.c (pic16_allocRegByName): removed not so helpful
debug message
* device/lib/Makefile.in: ignore failing PIC16 library builds
* device/lib/pic16/Makefile: do not build if gputils are missing
* device/lib/pic16/Makefile.common.in: do not enforce MAKEFLAGS=-s
tecodev [Wed, 10 Aug 2005 10:53:34 +0000 (10:53 +0000)]
* src/*.c, src/pic16/{gen.c,glue.c,main.c}: applied Vangelis
Rokas' patch to add the new fixed point type "__fixed16x16"
* device/lib/pic16/libsdcc/fixed16x16: added Vangelis' support
functions for __fixed16x16 arithmetics
* device/lib/pic16: reimplemented the build system to support
a separate build directory, better handling of libio (create
the library in a separate subdir for each architecture) and
easier configuration (centralized in Makefile.common)
tecodev [Sun, 7 Aug 2005 20:09:11 +0000 (20:09 +0000)]
* src/pic16/gen.c (genrshTwo): fixed sign extension
* src/pic16/device.c: added pic18f2320, 4220 and 4320
* device/include/pic16/pic18f2220.h: changed some bit definitions,
added T0CONbits
* device/include/pic16/pic18f4220.h: NEW, header for
pic18f4220 and pic18f4320
* device/include/pic16/pic18fregs.h: added new devices,
embraced Nop(), ClrWdt(), Sleep() and Reset() with do {} while(0)
* device/include/pic16/signal.h: resolved name clashes
on bit definitions, added DEF_HANDLER2(sig1,sig2,handler)
to also allow testing for interrupt enable bits, added
comments on how to use the macros
* device/lib/pic16/libdev/pic18f2220.c: added T0CONbits
* device/lib/pic16/libdev/pic18f{2320,4220,4320}.c: NEW,
register definitions for the devices
* device/lib/pic16/pics.all: added new devices
* device/lib/pic16/libc/stdlib/calloc.c: fixed zeroing
allocated memory
* device/lib/pic16/libc/stdlib/memfree: do not count
the block header as free memory
* device/lib/pic16/libc/stdlib/memmisc.c (_initHeap):
simplified and added missing end-of-blocklist-marker
(reported by Peter Onion, fixes #1252814)
* (_mergeHeapBlock): fixed loop condition
* device/lib/pic16/libc/stdlib/realloc.c: return NULL for
len==0, restructured code
* device/lib/pic16/libc/stdlib/{malloc,memfreemax}.c: cleaned
up a bit, reduced bitfield accesses, prevent endless loops
in case of heap corruption
* device/lib/pic16/libc/stdlib/x_ftoa.c: disabled
"unreferenced arguments/must return a value" warnings
* device/lib/pic16/libio/usart/ubaud.c (usart_baud):
replaced BAUDREG with SPBRG
* device/lib/pic16/libsdcc/lregs/{lrrest.c,lrst.c},
device/lib/pic16/debug/gstack/gstack.c: replaced
_naked, _asm, _endasm with __naked, __asm, __endasm
tecodev [Wed, 3 Aug 2005 12:00:24 +0000 (12:00 +0000)]
* src/pic16/gen.c (pic16_derefPtr): NEW, single place
to get/set values via pointers
* (genUnpackBits,genPackBits): changed detection of
ptr->bitfield vs. sym.bitfield, fixed access via generic
pointers, removed dead (wrong) code for multibyte bitfields
* (genNearPointerGet, genGenPointerGet): removed useless code,
fixed bitfield detection, fixes #1250594
* (genNearPointerSet): removed useless code
* src/pic16/gen.h: renamed pic16_emitpcode to pic16_emitpcode_real
and introduced macro pic16_emitpcode that conditionally emits
the origin of the following pCode (useful for debugging SDCC)
* src/pic16/pcode.c: changed (and disabled) some debug outputs
* (createDefmap): fixed handling of LFSR for --optimize-df
* src/pic/gen.h: added emitpcode macro for debugging
* src/pic/gen.c (emitpcode): renamed to emitpcode_real
and replace by macro adding debug information on demand
* (genNot): fixed to C semantics (!0 = 1; !x = 0 iff x != 0)
* (gencjne): tried to fix; replaced with correct (slower) code
* (gen{Unp,P}ackBits): fixed single bit access
* src/pic/pcode.c (AnalyzepCode): fixed DFPRINTF argument
* src/pic/pcodepeep.c (pCodeSearchCondition): fixed finding
previous instruction
* src/pic/pcoderegs.c (regIsSpecial): NEW, check whether a
register has to be handled with care (forbidding movement
of assignments/uses, removing assignments completely, ...)
* (pCodeOptime2pCodes): make use of regIsSpecial
* added lots of debugging output (commented out)
* src/pic/rallloc.c (deassignLRs): prevent operand registers
from being reused as result UNLESS it is known to work
* src/SDCCmain.c (linkEdit): initialized linkerScriptFileName,
have PIC14 handled like PIC16, fixes broken pic14 linker calls
* src/pic/gen.c (resolveIfx): do not "invent" labels
* (genSkipc): changed to positive logic
* (genSkipCond): removed as no longer needed
* (pic14_mov2w_regOrLit,genCmp): NEW, replacement for buggy version,
backport from PIC16
* (genLeftShift): check operands are in different registers
* src/pic/genarith.c (genPlus): replaced INCF with ADDLW as
INCF does not update CARRY...
* src/pic/main.c: fixed _linkCmd
* src/pic/pcode.c (unlinkpCode): added inactive code
* src/pic/ralloc.c (deassignLRs): keep arguments to shift operations
alive (do not assign result and operand overlapping registers)
* src/pic/device.c (dump_sfr): replaced register declaration with
call to emitSymbolToFile() to avoid duplicate symbols
* (assignRelocatableRegisters): do not declare external symbols
* src/pic/ralloc.c (allocNewDirReg): fixed to get size of arrays
right (take size of type, not etype)
* (allocDirReg): fixed call to allocNewDirReg() to pass OP_SYM_TYPE
* (writeUsedRegs): also dump dynDirectRegs (e.g. local variables)
* (packRegsForAccUse): disabled assignment of WREG as
the result reg to prevent occurence of just fixed #1235003,
fixes #1242954
* src/pic/glue.c (emitSymbolToFile): NEW, central place to declare
symbols (avoids duplicate symbols in .asm file)
* (pic14emitRegularMap): use emitSymbolToFile()
* src/pic/gen.c (aopOp): fixed spillLocation handling
* (gen{Unp,P}ackBits): fixed acquiring bit-operands
* (genDataPointerSet): removed unneccessary variables/output
* src/pic/gen.c (aopOp): do not generate AOP_ACC operands as pic14
architecture cannot handle them efficiently, fixes bug #1235003
* src/pic16/device.c (pic16_dump_{u,i}section,pic16_dump_int_registers):
check for empty sets before using them (fixes bug #1232190)
* as/mcs51/lkarea.c (lnkarea, lnkarea2): improved BSEG size calculation,
(lnksect2): generate warnings for memory overlap
* src/SDCC.lex (doPragma, process_pragma): added pragma's codeseg and
constseg to set the name of these segments so you can instruct the linker
to place them in banks
* src/SDCCast.c (decorateType): use new macro IS_FUNCPTR()
* src/SDCCglobl.h: added MODEL_HUGE to enum,
added code_seg and const_seg to options
* src/SDCCglue.c (emitMaps): use options.const_seg,
(createInterruptVect): put interrupt vectors in segment HOME,
(glue): put HOME before static segment and put the main glue in HOME,
(glue): use options.code_seg
* src/SDCCicode.c (geniCodeCall): use new macro IS_FUNCPTR()
* src/SDCCmain.c: added option --codeseg and --constseg to set the name of
these segments so you can instruct the linker to place them in banks
(linkEdit): use code_loc for HOME segment which should be the first
segment in code memory now
* src/SDCCmem.c: fixed more stuff like bug 1238386
* src/SDCCsymt.c (getSize): use generic pointer size for banked functions,
(changePointer): don't change function pointers to code pointers for
banked functions,
(compareType): added exceptional check for banked function pointers
* src/SDCCsymt.h: changed IFFUNC_ISBANKEDCALL, added IS_FUNCPTR
* src/hc08/main.c (_hc08_genAssemblerPreamble): put HOME first, put CSEG
after static in code memory
* src/mcs51/gen.c: added aopLiteralLong prototype,
(aopForSym): use getSize for functions,
(genCall): generate banked calls over one trampoline __sdcc_banked_call
in HOME with lsb of address in r0, msb in r1 and bank in r2, use
-Wl-bBANKSEG=0xbbaaaa option to set the address (aaaa) and bank (bb) of
the segment,
(genPcall): use call for literal function pointers and generate banked
calls over the one trampoline so there's only one place for the user to
modify according to his/hers hardware,
(genEndFunction): jump to __sdcc_banked_ret in HOME for banked functions,
(genPlusIncr): moved check icount>4 beyond inc dptr optimization
* src/mcs51/main.c: added keyword banked,
(_mcs51_genExtraAreas): put HOME first followed by GSINIT, STATIC and CSEG
* support/Util/SDCCerr.c,
* support/Util/SDCCerr.h: added E_BANKED_WITH_CALLEESAVES, registers are
needed for passing the bank and address to the trampoline
* device/lib/mcs51/crtbank.asm: added for bankswitching
* device/lib/mcs51/Makefile: added crtbank
* src/SDCCcse.c (algebraicOpts): fixed loss of volatility
for fields at offset 0 of a struct or union as reported
on 2005-07-07 in the developer mailing list.
* src/pic/gen.c (popGet): changed assert to allow for
bit operands
* (popGetAddr): changed signature to provide
an additional index, patched all call sites
* (genCmpEq): handle literal-like operands correctly
* (genAddrOf): added sanity checks on __code/__data pointers
* (genAssign): added handling of symbols from __code section
* (gencjne): do not generate code for comparisons whose result
is neither stored nor used, fixes bug #1171114
* (AccLsh, AccRsh): operate on operand instead of WREG
* (shift{Left,Right}_Left2ResultLit): NEW, size independant
replacement for Shift{LR}{12}Left2Result; shift (byte/int/long)
by known count
* rewrote complete shift-by-literal logic, commented unused
functions out
* (genConstPointerGet): get multiple bytes (if result size > 1),
fixed handling of non-immediate addresses
* (genPointerGet): handle CODE pointers like CONST pointers
* (genpic14Code): insert C-SRC lines as Cource-pCodes
* ({aop,op}_isLitLike): NEW, single place to decide whether an
operand is to be treated as a literal or not
* (mov2w,genPcall,genCmpEq),
src/pic/genarith.c: use aop_isLitLike() to decide between
literal/register contents
* (addSign): added missing offset
* src/pic/gen.h: remove newline after FENTRY/FEXIT comments,
only emit comment in debug-mode,
use {aop,op}_isLitLike throughout the file
* src/pic/glue.c: fix initializers for pointers (work in progress)
* src/pic/pcode.c (get_op): honor index on _const symbols
* ({reset,dump}pCodeStatistics): NEW, estimate code size
* (dumppBlock): added pCode size estimation
* src/pic/ralloc.c (deassignLRs,serialRegAssign,packRegisters):
check for IS_SYMOP before OP_SYMBOL'ing
* fixed indentation, compacted switch-statements
* (allocReg): find free register and allocate it instead of
allocating new registers all the time
* (deassignLRs): prevent POINTER_GET's from being assigned the same
registers as its operands (necessary only for multibyte GETs)
maartenbrock [Thu, 30 Jun 2005 18:03:33 +0000 (18:03 +0000)]
* doc/sdccman.lyx: documented sfr16/sfr32,
added example for using storage class with function pointers
* src/mcs51/gen.c (genPlusIncr): optimized small offsets from dptr