5 // ; Peephole 1 removed pop %1 push %1 (not push pop)
13 // ; Peephole 2 removed pop %1 push %1 (not push pop)
18 // added by Jean Louis VERN for
24 ; Peephole 2.a removed redundant xch xch
32 ; Peephole 3.a changed mov to clr
42 ; Peephole 3.b changed mov to clr
48 // saving 1 byte, loosing 1 cycle but maybe allowing peephole 3.b to start
53 ; Peephole 3.c changed mov to clr
69 ; Peephole 3.d removed redundant clr
83 ; Peephole 3.e removed redundant clr
99 ; Peephole 3.f removed redundant clr
117 ; Peephole 3.g removed redundant clr
129 ; Peephole 3.h changed mov %3,#0x00 to ...,a
144 ; Peephole 3.i changed mov %4,#0x00 to ...,a
161 ; Peephole 3.j changed mov %5,#0x00 to ...,a
180 ; Peephole 3.k changed mov %6,#0x00 to ...,a
192 ; Peephole 100 removed redundant mov
196 // applies to f.e. lib/src/time.c (--model-large)
213 ; Peephole 101.a removed redundant moves
221 // applies to f.e. support/regression/tests/literalop.c (--model-large)
235 ; Peephole 101.b removed redundant moves
241 // applies to f.e. support/regression/tests/onebyte.c (--model-large)
252 ; Peephole 101.c removed redundant mov
267 ; Peephole 102 removed redundant mov to %1
276 } if notVolatile(%1), labelRefCount(%3 1)
289 ; Peephole 103 removed redundant mov to %1
298 } if labelRefCount(%3 1)
300 // Does not seem to be triggered anymore
307 // ; Peephole 104 optimized increment (acc not set to r%1, flags undefined)
317 ; Peephole 105 removed redundant mov
327 ; Peephole 106 removed redundant mov
334 ; Peephole 107 removed redundant ljmp
336 } if labelRefCountChange(%1 -1)
343 ; Peephole 108.a removed ljmp by inverse jump logic
346 } if labelInRange(), labelRefCountChange(%1 -1)
353 ; Peephole 108.b removed ljmp by inverse jump logic
356 } if labelInRange(), labelRefCountChange(%1 -1)
363 ; Peephole 108.c removed ljmp by inverse jump logic
366 } if labelInRange(), labelRefCountChange(%1 -1)
373 ; Peephole 108.d removed ljmp by inverse jump logic
376 } if labelInRange(), labelRefCountChange(%2 -1)
383 ; Peephole 108.e removed ljmp by inverse jump logic
386 } if labelInRange(), labelRefCountChange(%2 -1)
392 ; Peephole 112.b changed ljmp to sjmp
405 ; Peephole 113.a optimized misc sequence
410 } if labelRefCount %3 1
421 ; Peephole 113.b optimized misc sequence
427 } if labelRefCount %3 2
436 ; Peephole 115.a jump optimization (acc not set)
440 } if labelRefCount %3 1
449 ; Peephole 115.b jump optimization
452 } if labelRefCountChange(%2 -1)
462 ; Peephole 115.c jump optimization (acc not set)
467 } if labelRefCount %3 2
478 ; Peephole 115.d jump optimization (acc not set)
484 } if labelRefCount %3 3
496 ; Peephole 115.e jump optimization (acc not set)
503 } if labelRefCount %3 4
512 ; Peephole 115.f jump optimization (acc not set)
515 } if labelRefCount(%3 1), labelRefCountChange(%3 -1)
525 ; Peephole 115.g jump optimization (acc not set)
529 } if labelRefCount(%3 2), labelRefCountChange(%3 -2), labelRefCountChange(%4 1)
540 ; Peephole 115.h jump optimization (acc not set)
545 } if labelRefCount(%3 3), labelRefCountChange(%3 -3), labelRefCountChange(%4 2)
557 ; Peephole 115.i jump optimization (acc not set)
563 } if labelRefCount(%3 4), labelRefCountChange(%3 -4), labelRefCountChange(%4 3)
572 ; Peephole 115.j jump optimization (acc not set)
576 } if labelRefCount %3 1
586 ; Peephole 115.k jump optimization (acc not set)
591 } if labelRefCount %3 2
602 ; Peephole 115.l jump optimization (acc not set)
608 } if labelRefCount %3 3
620 ; Peephole 115.m jump optimization (acc not set)
627 } if labelRefCount %3 4
640 ; Peephole 127 removed misc sequence
642 } if labelRefCount %3 0
649 ; Peephole 128 jump optimization
653 // applies to: bug-524691.c --model-large: while (uRight - uLeft > 1)
659 ; Peephole 129.a jump optimization
663 // applies to: _fsdiv.c --xstack: if (mant1 < mant2)
670 ; Peephole 129.b optimized condition
675 // applies to: time.c --xstack: while((days += (LEAP_YEAR(year) ? 366 : 365)) <= epoch)
683 ; Peephole 129.c optimized condition
687 } if notVolatile %1 %2
689 // applies to: _memmove.c --xstack: if (((int)src < (int)dst) && ((((int)src)+acount) > (int)dst))
698 ; Peephole 129.d optimized condition
703 } if notVolatile %1 %2 %3
708 ; Peephole 130 changed target address mode r%1 to ar%1
718 ; Peephole 131 optimized decrement (not caring for c)
723 // ideally the optimizations of rules 132.x should be done in genCmpXX
730 ; Peephole 132.a optimized genCmpGt by inverse logic (acc differs)
734 } if operandsLiteral(%1)
742 ; Peephole 132.b optimized genCmpGt by inverse logic (acc differs)
746 } if operandsLiteral(%1)
754 ; Peephole 132.c optimized genCmpGt by inverse logic (acc differs)
758 } if operandsLiteral(%1)
766 ; Peephole 132.d optimized genCmpGt by inverse logic
770 } if operandsNotRelated('0x00' %2), operandsLiteral(%2)
778 ; Peephole 132.e optimized genCmpLt by inverse logic (carry differs)
782 } if operandsNotRelated('0x00' %2), operandsLiteral(%2)
790 ; Peephole 132.f optimized genCmpLt by inverse logic (carry differs)
794 } if operandsNotRelated('0x00' %2), operandsLiteral(%2)
805 ; Peephole 133 removed redundant moves
818 ; Peephole 134 removed redundant moves
829 ; Peephole 135 removed redundant mov
842 ; Peephole 136 removed redundant mov
845 // WTF? Doesn't look sensible to me...
855 // ; Peephole 137 optimized misc jump sequence
859 //} if labelRefCount %4 1
870 // ; Peephole 138 optimized misc jump sequence
875 //} if labelRefCount %4 1
882 ; Peephole 139.a removed redundant mov
892 ; Peephole 139.b removed redundant mov
902 ; Peephole 139.c removed redundant mov
907 // applies to genlshOne
914 ; Peephole 140 removed redundant mov
925 ; Peephole 142 removed redundant mov
934 ; Peephole 143.a converted rlc to rl
942 ; Peephole 143.b converted rrc to rc
950 ; Peephole 145.a changed to add without carry
959 ; Peephole 145.b changed to add without carry
964 // 147: Fix compiler output to comply with 8051 instruction set.
968 ; Peephole 147.a changed target address mode r%1 to ar%1
975 ; Peephole 147.b changed target address mode r%1 to ar%1
982 ; Peephole 147.c changed target address mode r%1 to ar%1
992 ; Peephole 150.a removed misc moves via dpl before return
1005 ; Peephole 150.b removed misc moves via dph, dpl before return
1017 ; Peephole 150.c removed misc moves via dph, dpl before return
1032 ; Peephole 150.d removed misc moves via dph, dpl, b before return
1045 ; Peephole 150.e removed misc moves via dph, dpl, b before return
1059 ; Peephole 150.f removed misc moves via dph, dpl, b before return
1076 ; Peephole 150.g removed misc moves via dph, dpl, b, a before return
1091 ; Peephole 150.h removed misc moves via dph, dpl, b, a before return
1105 ; Peephole 150.i removed misc moves via dph, dpl, b, a before return
1110 // peephole 213.a might revert this
1115 ; Peephole 159 avoided xrl during execution
1124 ; Peephole 160.a removed sjmp by inverse jump logic
1127 } if labelRefCountChange(%1 -1)
1134 ; Peephole 160.b removed sjmp by inverse jump logic
1137 } if labelRefCountChange(%1 -1)
1144 ; Peephole 160.c removed sjmp by inverse jump logic
1147 } if labelRefCountChange(%1 -1)
1154 ; Peephole 160.d removed sjmp by inverse jump logic
1157 } if labelRefCountChange(%1 -1)
1164 ; Peephole 160.e removed sjmp by inverse jump logic
1167 } if labelRefCountChange(%1 -1)
1174 ; Peephole 160.f removed sjmp by inverse jump logic
1177 } if labelRefCountChange(%1 -1)
1186 ; Peephole 166 removed redundant mov
1187 } if notVolatile %1 %2
1194 ; Peephole 167 removed redundant bit moves (c not set to %1)
1203 ; Peephole 168 jump optimization
1206 } if labelRefCountChange(%2 -1)
1213 ; Peephole 169 jump optimization
1216 } if labelRefCountChange(%2 -1)
1225 ; Peephole 170 jump optimization
1228 } if labelRefCount(%3 1), labelRefCountChange(%3 -1)
1238 ; Peephole 171 jump optimization
1242 } if labelRefCount(%3 2), labelRefCountChange(%3 -2), labelRefCountChange(%4 1)
1253 ; Peephole 172 jump optimization
1258 } if labelRefCount(%3 3), labelRefCountChange(%3 -3), labelRefCountChange(%4 2)
1270 ; Peephole 173 jump optimization
1276 } if labelRefCount(%3 4), labelRefCountChange(%3 -4), labelRefCountChange(%4 3)
1286 ; Peephole 174.a optimized decrement (acc not set to %2, flags undefined)
1297 ; Peephole 174.b optimized increment (acc not set to %2, flags undefined)
1306 ; Peephole 174.c optimized increment, removed redundant mov
1311 // this one will screw assignes to volatile/sfr's
1317 ; Peephole 177.a removed redundant mov
1318 } if notVolatile %1 %2
1320 // applies to f.e. scott-add.asm (--model-large)
1326 ; Peephole 177.b removed redundant mov
1329 // applies to f.e. bug-408972.c
1334 ; Peephole 177.c removed redundant mov
1336 } if notVolatile %1 %2
1338 // applies to f.e. bug-408972.c
1339 // not before peephole 177.c
1347 ; Peephole 177.d removed redundant mov
1348 } if notVolatile(%1 %2),operandsNotRelated(%1 %2 %3)
1350 // applies to f.e. bug-607243.c
1351 // also check notVolatile %3, as it will return FALSE if it's @r%1
1356 ; peephole 177.e removed redundant mov
1358 } if notVolatile %2 %3
1364 ; peephole 177.f removed redundant mov
1372 ; peephole 177.g optimized mov sequence
1381 ; peephole 177.h optimized mov sequence
1391 ; Peephole 178 removed redundant mov
1396 // rules 179-182 provided by : Frieder <fe@lake.iup.uni-heidelberg.de>
1397 // saving 2 byte, 1 cycle
1402 ; Peephole 179 changed mov to clr
1408 // volatile xdata char t; t=0x01; t=0x03;
1418 ; Peephole 180.a removed redundant mov to dptr
1421 // volatile xdata char t; t=0x01; t=0x03; t=0x01;
1435 ; Peephole 180.b removed redundant mov to dptr
1438 // saving 1 byte, 0 cycles
1442 ; Peephole 181 changed mov to clr
1446 // saving 3 bytes, 2 cycles
1447 // provided by Bernhard Held <bernhard.held@de.westinghouse.com>
1452 ; Peephole 182.a used 16 bit load of DPTR
1456 // saving 3 byte, 2 cycles, return(NULL) profits here
1461 ; Peephole 182.b used 16 bit load of dptr
1465 // saving 3 byte, 2 cycles. Probably obsoleted by 182.b
1470 ; Peephole 182.c used 16 bit load of dptr
1471 mov dptr,#(((%2)<<8) + %1)
1474 // applies to return 0.0; in f.e. sincosf.c
1480 ; Peephole 182.d used 16 bit load of dptr
1481 mov dptr,#(%1&0x00ff)
1489 ; Peephole 183 avoided anl during execution
1498 ; Peephole 184 removed redundant mov
1504 // acc being incremented might cause problems
1508 ; Peephole 185 changed order of increment (acc incremented also!)
1513 // char indexed access to: long code table[] = {4,3,2,1};
1535 ; Peephole 186.a optimized movc sequence
1553 // char indexed access to: void* code table[] = {4,3,2,1};
1571 ; Peephole 186.b optimized movc sequence
1585 // char indexed access to: int code table[] = {4,3,2,1};
1599 ; Peephole 186.c optimized movc sequence
1608 // char indexed access to: char code table[] = {4,3,2,1};
1618 ; Peephole 186.d optimized movc sequence
1623 // char indexed access to: int code table[] = {4,3,2,1};
1638 ; Peephole 186.e optimized movc sequence (b, dptr differ)
1656 ; Peephole 187 used a instead of ar%1 for anl
1668 ; Peephole 188 removed redundant mov
1682 ; Peephole 189 removed redundant mov and anl
1685 // rules 190 & 191 need to be in order
1693 ; Peephole 190 removed redundant mov
1707 ; Peephole 191 removed redundant mov
1715 ; Peephole 192 used a instead of ar%1 as source
1731 ; Peephole 193.a optimized misc jump sequence
1741 } if labelRefCount(%3 4), labelRefCountChange(%3 -4), labelRefCountChange(%8 3)
1755 ; Peephole 193.b optimized misc jump sequence
1765 } if labelRefCount(%3 4), labelRefCountChange(%3 -4), labelRefCountChange(%8 3)
1779 ; Peephole 193.c optimized misc jump sequence
1789 } if labelRefCount(%3 4), labelRefCountChange(%3 -4), labelRefCountChange(%8 3)
1800 ; Peephole 194 optimized misc jump sequence
1807 } if labelRefCount(%3 4), labelRefCountChange(%3 -4), labelRefCountChange(%8 3)
1819 ; Peephole 195.a optimized misc jump sequence
1827 } if labelRefCount(%3 3), labelRefCountChange(%3 -3), labelRefCountChange(%8 2)
1839 ; Peephole 195.b optimized misc jump sequence
1847 } if labelRefCount(%3 3), labelRefCountChange(%3 -3), labelRefCountChange(%8 2)
1859 ; Peephole 195.c optimized misc jump sequence
1867 } if labelRefCount(%3 3), labelRefCountChange(%3 -3), labelRefCountChange(%8 2)
1877 ; Peephole 196 optimized misc jump sequence
1883 } if labelRefCount(%3 3), labelRefCountChange(%3 -3), labelRefCountChange(%8 2)
1893 ; Peephole 197.a optimized misc jump sequence
1899 } if labelRefCount(%3 2), labelRefCountChange(%3 -2), labelRefCountChange(%8 1)
1909 ; Peephole 197.b optimized misc jump sequence
1915 } if labelRefCount(%3 2), labelRefCountChange(%3 -2), labelRefCountChange(%8 1)
1925 ; Peephole 197.c optimized misc jump sequence
1931 } if labelRefCount(%3 2), labelRefCountChange(%3 -2), labelRefCountChange(%8 1)
1940 ; Peephole 198.a optimized misc jump sequence
1945 } if labelRefCount(%3 2), labelRefCountChange(%3 -2), labelRefCountChange(%8 1)
1953 ; Peephole 198.b optimized misc jump sequence
1957 } if labelRefCount(%3 1), labelRefCountChange(%3 -1)
1963 ; Peephole 200.a removed redundant sjmp
1965 } if labelRefCountChange(%1 -1)
1972 ; Peephole 200.b removed redundant sjmp
1975 } if labelRefCountChange(%1 -1)
1982 ; Peephole 202 removed redundant push pop
1991 ; Peephole 203 removed mov r%1,_spx
2000 ; Peephole 204 removed redundant mov
2012 ; Peephole 205 optimized misc jump sequence
2016 } if labelRefCount(%2 1), labelRefCountChange(%2 -1), labelRefCountChange(%3 -1)
2021 ; Peephole 206 removed redundant mov %1,%1
2024 // Does not seem to be triggered anymore
2030 // ; Peephole 207 removed zero add (acc not set to %1, flags undefined)
2039 ; Peephole 208 removed redundant push pop
2043 // Does not seem to be triggered anymore
2050 // ; Peephole 209 optimized increment (acc not set to %1, flags undefined)
2056 mov dptr,#((((%1 >> 8)) <<8) + %1)
2058 ; Peephole 210 simplified expression
2066 ; Peephole 211 removed redundant push %1 pop %1
2069 // Does not seem to be triggered anymore
2075 // ; Peephole 212 reduced add sequence to inc
2080 // reverts peephole 159? asx8051 cannot handle, too complex?
2082 mov %1,#(( %2 >> 8 ) ^ 0x80)
2084 ; Peephole 213.a inserted fix
2090 mov %1,#(( %2 + %3 >> 8 ) ^ 0x80)
2092 ; Peephole 213.b inserted fix
2093 mov %1,#((%2 + %3) >> 8)
2104 ; Peephole 214.a removed redundant mov
2106 } if operandsNotSame
2113 ; Peephole 214.b removed redundant mov
2116 } if operandsNotSame
2128 ; Peephole 216.a simplified clear (2 bytes)
2147 ; Peephole 216.b simplified clear (3 bytes)
2171 ; Peephole 216.c simplified clear (4 bytes)
2188 ; Peephole 219.a removed redundant clear
2209 ; Peephole 219.b removed redundant clear
2217 ; Peephole 220.a removed bogus DPS set
2225 ; Peephole 220.b removed bogus DPS set
2230 mov %1 + %2,(%2 + %1)
2232 ; Peephole 221.a remove redundant mov
2236 mov (%1 + %2 + %3),((%2 + %1) + %3)
2238 ; Peephole 221.b remove redundant mov
2245 ; Peephole 222 removed dec/inc pair
2256 ; Peephole 223.a removed redundant dph/dpl moves
2257 } if notVolatile %1 %2
2267 ; Peephole 223.b removed redundant dph/dpl moves
2283 ; Peephole 225 removed redundant move to acc
2295 ; Peephole 226.a removed unnecessary clr
2311 ; Peephole 226.b removed unnecessary clr
2330 ; Peephole 227.a replaced inefficient 32 bit clear
2357 ; Peephole 227.b replaced inefficient 32 constant
2380 ; Peephole 227.c replaced inefficient 16 bit clear
2397 ; Peephole 227.d replaced inefficient 16 bit constant
2406 // this last peephole often removes the last mov from 227.a - 227.d
2411 ; Peephole 227.e removed redundant mov to dptr
2418 ; Peephole 232 using movc to read xdata (--xram-movc)
2426 ; Peephole 233 using _gptrgetc instead of _gptrget (--xram-movc)
2436 ; Peephole 234.a loading dpl directly from a(ccumulator), r%1 not set
2449 ; Peephole 234.b loading dph directly from a(ccumulator), r%1 not set
2456 // 14 rules by Fiorenzo D. Ramaglia <fd.ramaglia@tin.it>
2461 ; Peephole 236.a used r%1 instead of ar%1
2468 ; Peephole 236.b used r%1 instead of ar%1
2475 ; Peephole 236.c used r%1 instead of ar%1
2482 ; Peephole 236.d used r%1 instead of ar%1
2489 ; Peephole 236.e used r%1 instead of ar%1
2496 ; Peephole 236.f used r%1 instead of ar%1
2503 ; Peephole 236.g used r%1 instead of ar%1
2510 ; Peephole 236.h used r%1 instead of ar%1
2517 ; Peephole 236.i used r%1 instead of ar%1
2524 ; Peephole 236.j used r%1 instead of ar%1
2531 ; Peephole 236.k used r%1 instead of ar%1
2538 ; Peephole 236.l used r%1 instead of ar%1
2545 ; Peephole 236.m used r%1 instead of ar%1
2552 ; Peephole 236.n used r%1 instead of ar%1
2563 ; Peephole 237.a removed sjmp to ret
2569 } if labelRefCountChange(%1 -1)
2580 ; Peephole 237.b removed sjmp to ret
2588 } if labelRefCountChange(%1 -1)
2590 // applies to f.e. device/lib/log10f.c
2616 ; Peephole 238.a removed 4 redundant moves
2617 } if operandsNotSame8(%1 %2 %3 %4 %5 %6 %7 %8), notVolatile(%1 %2 %3 %4 %9 %10 %11 %12)
2619 // applies to device/lib/log10f.c
2634 ; Peephole 238.b removed 3 redundant moves
2635 } if operandsNotSame7(%1 %2 %3 %4 %5 %6 %7), notVolatile(%1 %2 %3 %5 %6 %7)
2637 // applies to f.e. device/lib/time.c
2653 ; Peephole 238.c removed 2 redundant moves
2654 } if operandsNotSame4(%1 %2 %3 %4), notVolatile(%1 %2 %5 %6)
2656 // applies to f.e. support/regression/tests/bug-524209.c
2669 ; Peephole 238.d removed 3 redundant moves
2670 } if operandsNotSame6(%1 %2 %3 %4 %5 %6), notVolatile(%1 %2 %3 %4 %5 %6)
2672 // applies to f.e. ser_ir.asm
2676 ; Peephole 239 used a instead of acc
2684 ; Peephole 240 use clr instead of addc a,#0
2689 // peepholes 241.a to 241.d and 241.e to 241.h need to be in order
2701 ; Peephole 241.a optimized compare
2710 } if labelRefCountChange(%1 -1)
2712 // applies to generic pointer compare
2723 ; Peephole 241.b optimized compare
2731 } if labelRefCountChange(%1 -1)
2733 // applies to f.e. time.c
2743 ; Peephole 241.c optimized compare
2750 } if labelRefCountChange(%1 -1)
2752 // applies to f.e. malloc.c
2761 ; Peephole 241.d optimized compare
2767 } if labelRefCountChange(%1 -1)
2769 // applies to f.e. j = (k!=0x1000);
2770 // with volatile idata long k;
2785 ; Peephole 241.e optimized compare
2797 } if labelRefCountChange(%2 -1)
2799 // applies to f.e. j = (p!=NULL);
2800 // with volatile idata char *p;
2813 ; Peephole 241.f optimized compare
2823 } if labelRefCountChange(%2 -1)
2825 // applies to f.e. j = (k!=0x1000);
2826 // with volatile idata int k;
2837 ; Peephole 241.g optimized compare
2845 } if labelRefCountChange(%2 -1)
2847 // applies to f.e. vprintf.asm (--stack-auto)
2856 ; Peephole 241.h optimized compare
2862 } if labelRefCountChange(%2 -1)
2864 // applies to f.e. scott-bool1.c
2873 ; Peephole 242.a avoided branch jnz to jz
2876 } if labelRefCount %1 1
2878 // applies to f.e. scott-bool1.c
2889 ; Peephole 242.b avoided branch jnz to jz
2892 } if labelRefCount %1 1
2894 // applies to f.e. logic.c
2909 ; Peephole 242.c avoided branch jnz to jz
2912 } if labelRefCount %1 1
2914 // applies to f.e. vprintf.c
2915 // this is a rare case, usually the "tail increment" is noticed earlier
2922 ; Peephole 243 avoided branch to sjmp
2927 } if labelInRange(), labelRefCountChange(%3 -1), labelRefCountChange(%5 1)
2929 // applies to f.e. simplefloat.c (saving 1 cycle)
2934 ; Peephole 244.a moving first to a instead of r%1
2939 // applies to f.e. _itoa.c (saving 1 cycle)
2944 ; Peephole 244.b moving first to a instead of r%1
2950 // applies to f.e. bug-460010.c (saving 1 cycle)
2956 ; Peephole 244.c loading dpl from a instead of r%1
2965 ; Peephole 244.d loading dph from a instead of r%1
2969 // this one is safe but disables 245.a 245.b
2970 // please remove 245 if 245.a 245.b are found to be safe
2971 // applies to f.e. scott-compare.c
2982 ; Peephole 245 optimized complement (r%1 and acc set needed?)
2987 } if labelRefCount(%2 1), labelRefCountChange(%2 -1)
2989 // this one will not be triggered if 245 is present
2990 // please remove 245 if 245.a 245.b are found to be safe
2991 // applies to f.e. vprintf.c
3003 ; Peephole 245.a optimized conditional jump (r%1 and acc not set!)
3005 } if labelRefCount(%2 1), labelRefCountChange(%2 -1)
3007 // this one will not be triggered if 245 is present
3008 // please remove 245 if 245.a 245.b are found to be safe
3009 // applies to f.e. scott-compare.c
3021 ; Peephole 245.b optimized conditional jump (r%1 and acc not set!)
3023 } if labelRefCount(%2 1), labelRefCountChange(%2 -1)
3026 // rules 246.x apply to f.e. bitfields.c
3039 ; Peephole 246.a combined clr/clr
3056 ; Peephole 246.b combined set/set
3074 ; Peephole 246.c combined set/clr
3092 ; Peephole 246.d combined clr/set
3111 ; Peephole 246.e combined set/clr/clr
3131 ; Peephole 246.f combined set/clr/set
3151 ; Peephole 246.g combined clr/set/clr
3170 ; Peephole 246.h combined clr/set/set
3176 // rules 247.x apply to f.e. bitfields.c
3189 ; Peephole 247.a combined clr/clr
3206 ; Peephole 247.b combined set/set
3224 ; Peephole 247.c combined set/clr
3242 ; Peephole 247.d combined clr/set
3261 ; Peephole 247.e combined set/clr/clr
3281 ; Peephole 247.f combined set/clr/set
3301 ; Peephole 247.g combined clr/set/clr
3320 ; Peephole 247.h combined clr/set/set
3326 // Peepholes 248.x have to be compatible with the keyword volatile.
3327 // They optimize typical accesses to memory mapped I/O devices:
3328 // volatile xdata char t; t|=0x01;
3341 ; Peephole 248.a optimized or to xdata
3346 // volatile xdata char t; t&=0x01;
3359 ; Peephole 248.b optimized and to xdata
3364 // volatile xdata char t; t^=0x01;
3377 ; Peephole 248.c optimized xor to xdata
3382 // volatile xdata char t; t|=0x01; t&=~0x01; t|=0x01;
3404 ; Peephole 248.d optimized or/and/or to volatile xdata
3416 // volatile xdata char t; t&=~0x01; t|=0x01; t&=~0x01;
3438 ; Peephole 248.e optimized and/or/and to volatile xdata
3450 // volatile xdata char t; t|=0x01; t&=~0x01;
3466 ; Peephole 248.f optimized or/and to volatile xdata
3475 // volatile xdata char t; t&=~0x01; t|=0x01;
3491 ; Peephole 248.g optimized and/or to volatile xdata
3500 // volatile xdata char t; t^=0x01; t^=0x01;
3516 ; Peephole 248.h optimized xor/xor to volatile xdata
3525 // Peeepholes 248.i to 248.m are like 248.d to 248.h except they apply to bitfields:
3526 // xdata struct { unsigned b0:1; unsigned b1:1; unsigned b2:1; } xport;
3527 // xport.b0=1; xport.b0=0; xport.b0=1;
3548 ; Peephole 248.i optimized or/and/or to xdata bitfield
3577 ; Peephole 248.j optimized and/or/and to xdata bitfield
3601 ; Peephole 248.k optimized or/and to xdata bitfield
3622 ; Peephole 248.l optimized and/or to xdata bitfield
3643 ; Peephole 248.m optimized xor/xor to xdata bitfield
3654 ; Peephole 249.a jump optimization
3655 } if labelRefCount(%1 1), labelRefCountChange(%1 -1)
3661 ; Peephole 249.b jump optimization
3662 } if labelRefCount(%1 1), labelRefCountChange(%1 -1)
3665 // This allows non-interrupt and interrupt code to safely compete
3666 // for a resource without the non-interrupt code having to disable
3668 // volatile bit resource_is_free;
3669 // if( resource_is_free ) {
3670 // resource_is_free=0; do_something; resource_is_free=1;
3677 ; Peephole 250.a using atomic test and clear
3681 } if labelRefCount(%3 0), labelRefCountChange(%3 1)
3689 ; Peephole 250.b using atomic test and clear
3693 } if labelRefCount %2 1
3696 // not before peephole 250.b
3700 ; Peephole 251.a replaced ljmp to ret with ret
3702 } if labelIsReturnOnly(), labelRefCountChange(%5 -1)
3704 // not before peephole 250.b
3708 ; Peephole 251.b replaced sjmp to ret with ret
3710 } if labelIsReturnOnly(), labelRefCountChange(%5 -1)
3712 // applies to shifts.c and when accessing arrays with an unsigned integer index
3713 // saving 1 byte, 2 cycles
3723 ; Peephole 252 optimized left shift
3732 // applies to: void test( char c ) { if( c ) func1(); else func2(); }
3737 ; Peephole 253.a replaced lcall/ret with ljmp
3741 // applies to: void test( char c ) { if( c ) func1(); else func2(); }
3747 ; Peephole 253.b replaced lcall/ret with ljmp
3750 } if labelRefCount %2 0
3752 // applies to f.e. scott-bool1.c
3758 ; Peephole 253.c replaced lcall with ljmp
3765 // applies to f.e. funptrs.c
3766 // saves one byte if %1 is a register or @register
3772 ; Peephole 254 optimized left shift
3776 // applies to f.e. switch.c
3789 ; Peephole 255 optimized jump table index calculation
3791 cjne a,#(%1+0x01),.+1
3800 // applies to f.e. jump tables and scott-bool1.c.
3801 // similar peepholes can be constructed for other instructions
3802 // after which a flag or a register is known (like: djnz, cjne, jnc)
3810 ; Peephole 256.a removed redundant clr c
3811 } if labelRefCount %2 0
3813 // applies to f.e. logf.c
3821 ; Peephole 256.b removed redundant clr a
3822 } if labelRefCount %2 0
3824 // applies to f.e. bug-905492.c
3832 ; Peephole 256.c loading %3 with zero from a
3834 } if labelRefCount %2 0
3836 // applies to f.e. malloc.c
3846 ; Peephole 256.d loading %3 with zero from a
3848 } if labelRefCount(%2 0),operandsNotRelated('a' %4)
3861 ; Peephole 256.e loading %3 with zero from a
3863 } if labelRefCount(%2 0),operandsNotRelated('a' %4 %6)
3878 ; Peephole 256.f loading %2 with zero from a
3880 } if labelRefCount(%2 0),operandsNotRelated('a' %4 %6 %8)
3883 // unsigned char i=8; do{ } while(--i != 0);
3884 // this applies if i is kept in a register
3889 ; Peephole 257.a optimized decrement with compare
3891 } if notVolatile(%1)
3893 // unsigned char i=8; do{ } while(--i != 0);
3894 // this applies if i is kept in data memory
3900 ; Peephole 257.b optimized decrement with compare
3902 } if notVolatile(%1), operandsNotRelated(%1 '@r0' '@r1')
3905 // in_byte<<=1; if(in_bit) in_byte|=1;
3906 // helps f.e. reading data on a 3-wire (SPI) bus
3917 ; Peephole 258.a optimized bitbanging
3923 } if notVolatile(%1), labelRefCountChange(%3 -1)
3925 // in_byte<<=1; if(in_bit) in_byte|=1;
3936 ; Peephole 258.b optimized bitbanging
3942 } if labelRefCountChange(%3 -1)
3944 // in_byte>>=1; if(in_bit) in_byte|=0x80;
3956 ; Peephole 258.c optimized bitbanging
3962 } if notVolatile(%1), labelRefCountChange(%3 -1)
3964 // in_byte>>=1; if(in_bit) in_byte|=0x80;
3976 ; Peephole 258.d optimized bitbanging
3982 } if labelRefCountChange(%3 -1)
3984 // out_bit=out_byte&0x80; out_byte<<=1;
3985 // helps f.e. writing data on a 3-wire (SPI) bus
3995 ; Peephole 258.e optimized bitbanging
4001 // out_bit=out_byte&0x01; out_byte>>=1;
4012 ; Peephole 258.f optimized bitbanging
4019 // Peepholes 259.x rely on the correct labelRefCount. Otherwise they are
4020 // not compatible with peepholes 250.x
4021 // Peepholes 250.x add jumps to a previously unused label. If the
4022 // labelRefCount is not increased, peepholes 259.x are (mistakenly) applied.
4023 // (Mail on sdcc-devel 2004-10-25)
4025 // applies to f.e. vprintf.c
4032 ; Peephole 259.a removed redundant label %2 and ret
4034 } if labelRefCount %2 0
4036 // applies to f.e. gets.c
4043 ; Peephole 259.b removed redundant label %2 and ret
4045 } if labelRefCount %2 0
4047 // optimizing jumptables
4048 // Please note: to enable peephole 260.x you currently have to set
4049 // the environment variable SDCC_SJMP_JUMPTABLE
4061 ; Peephole 260.a used sjmp in jumptable
4072 // optimizing jumptables
4085 ; Peephole 260.b used sjmp in jumptable
4097 // optimizing jumptables
4111 ; Peephole 260.c used sjmp in jumptable
4124 // optimizing jumptables
4139 ; Peephole 260.d used sjmp in jumptable
4153 // optimizing jumptables
4169 ; Peephole 260.e used sjmp in jumptable
4184 // optimizing jumptables
4202 ; Peephole 260.f used sjmp in jumptable
4219 // optimizing jumptables
4238 ; Peephole 260.g used sjmp in jumptable
4256 // optimizing jumptables
4276 ; Peephole 260.h used sjmp in jumptable
4295 // optimizing jumptables
4316 ; Peephole 260.i used sjmp in jumptable
4336 // optimizing jumptables
4358 ; Peephole 260.j used sjmp in jumptable
4379 // optimizing jumptables
4402 ; Peephole 260.k used sjmp in jumptable
4424 // optimizing jumptables
4448 ; Peephole 260.l used sjmp in jumptable
4471 // optimizing jumptables
4496 ; Peephole 260.m used sjmp in jumptable
4520 // applies to: a = (a << 1) | (a >> 15);
4534 ; Peephole 261.a optimized left rol
4542 // applies to: a = (a << 15) | (a >> 1);
4556 ; Peephole 261.b optimized right rol
4568 ; Peephole 262 removed redundant cpl c
4577 ; Peephole 263.a optimized loading const
4586 ; Peephole 263.b optimized loading const
4594 ; Peephole 263.c optimized loading const
4606 ; Peephole 264 jump optimization (acc not set)
4609 } if labelRefCount(%3 1), labelRefCountChange(%3 -1)
4612 // should be one of the last peepholes
4616 ; Peephole 300 removed redundant label %1
4617 } if labelRefCount(%1 0)