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
206 ; Peephole 101 removed redundant mov
221 ; Peephole 102 removed redundant mov
243 ; Peephole 103 removed redundant mov
260 ; Peephole 104 optimized increment (acc not set to r%1, flags undefined)
270 ; Peephole 105 removed redundant mov
280 ; Peephole 106 removed redundant mov
287 ; Peephole 107 removed redundant ljmp
289 } if labelRefCountChange(%1 -1)
296 ; Peephole 108.a removed ljmp by inverse jump logic
299 } if labelInRange(), labelRefCountChange(%1 -1)
306 ; Peephole 108.b removed ljmp by inverse jump logic
309 } if labelInRange(), labelRefCountChange(%1 -1)
316 ; Peephole 108.c removed ljmp by inverse jump logic
319 } if labelInRange(), labelRefCountChange(%1 -1)
326 ; Peephole 108.d removed ljmp by inverse jump logic
329 } if labelInRange(), labelRefCountChange(%2 -1)
336 ; Peephole 108.e removed ljmp by inverse jump logic
339 } if labelInRange(), labelRefCountChange(%2 -1)
345 ; Peephole 112.b changed ljmp to sjmp
358 ; Peephole 113.a optimized misc sequence
363 } if labelRefCount %3 1
374 ; Peephole 113.b optimized misc sequence
380 } if labelRefCount %3 2
389 ; Peephole 115.a jump optimization (acc not set)
393 } if labelRefCount %3 1
402 ; Peephole 115.b jump optimization
405 } if labelRefCountChange(%2 -1)
415 ; Peephole 115.c jump optimization (acc not set)
420 } if labelRefCount %3 2
431 ; Peephole 115.d jump optimization (acc not set)
437 } if labelRefCount %3 3
449 ; Peephole 115.e jump optimization (acc not set)
456 } if labelRefCount %3 4
465 ; Peephole 115.f jump optimization (acc not set)
468 } if labelRefCount(%3 1), labelRefCountChange(%3 -1)
478 ; Peephole 115.g jump optimization (acc not set)
482 } if labelRefCount(%3 2), labelRefCountChange(%3 -2), labelRefCountChange(%4 1)
493 ; Peephole 115.h jump optimization (acc not set)
498 } if labelRefCount(%3 3), labelRefCountChange(%3 -3), labelRefCountChange(%4 2)
510 ; Peephole 115.i jump optimization (acc not set)
516 } if labelRefCount(%3 4), labelRefCountChange(%3 -4), labelRefCountChange(%4 3)
525 ; Peephole 115.j jump optimization (acc not set)
529 } if labelRefCount %3 1
539 ; Peephole 115.k jump optimization (acc not set)
544 } if labelRefCount %3 2
555 ; Peephole 115.l jump optimization (acc not set)
561 } if labelRefCount %3 3
573 ; Peephole 115.m jump optimization (acc not set)
580 } if labelRefCount %3 4
593 ; Peephole 127 removed misc sequence
595 } if labelRefCount %3 0
602 ; Peephole 128 jump optimization
606 // applies to: bug-524691.c --model-large: while (uRight - uLeft > 1)
612 ; Peephole 129.a jump optimization
616 // applies to: _fsdiv.c --xstack: if (mant1 < mant2)
623 ; Peephole 129.b optimized condition
628 // applies to: time.c --xstack: while((days += (LEAP_YEAR(year) ? 366 : 365)) <= epoch)
636 ; Peephole 129.c optimized condition
640 } if notVolatile %1 %2
642 // applies to: _memmove.c --xstack: if (((int)src < (int)dst) && ((((int)src)+acount) > (int)dst))
651 ; Peephole 129.d optimized condition
656 } if notVolatile %1 %2 %3
661 ; Peephole 130 changed target address mode r%1 to ar%1
671 ; Peephole 131 optimized decrement (not caring for c)
676 // ideally the optimizations of rules 132.x should be done in genCmpXX
683 ; Peephole 132.a optimized genCmpGt by inverse logic (acc differs)
687 } if operandsLiteral(%1)
695 ; Peephole 132.b optimized genCmpGt by inverse logic (acc differs)
699 } if operandsLiteral(%1)
707 ; Peephole 132.c optimized genCmpGt by inverse logic (acc differs)
711 } if operandsLiteral(%1)
719 ; Peephole 132.d optimized genCmpGt by inverse logic
723 } if operandsNotRelated('0x00' %2), operandsLiteral(%2)
731 ; Peephole 132.e optimized genCmpLt by inverse logic (carry differs)
735 } if operandsNotRelated('0x00' %2), operandsLiteral(%2)
743 ; Peephole 132.f optimized genCmpLt by inverse logic (carry differs)
747 } if operandsNotRelated('0x00' %2), operandsLiteral(%2)
758 ; Peephole 133 removed redundant moves
771 ; Peephole 134 removed redundant moves
782 ; Peephole 135 removed redundant mov
795 ; Peephole 136 removed redundant move
798 // WTF? Doesn't look sensible to me...
808 // ; Peephole 137 optimized misc jump sequence
812 //} if labelRefCount %4 1
823 // ; Peephole 138 optimized misc jump sequence
828 //} if labelRefCount %4 1
835 ; Peephole 139.a removed redundant mov
845 ; Peephole 139.b removed redundant mov
854 ; Peephole 139.c removed redundant mov
859 // applies to genlshOne
866 ; Peephole 140 removed redundant mov
877 ; Peephole 142 removed redundant moves
886 ; Peephole 143.a converted rlc to rl
894 ; Peephole 143.b converted rrc to rc
902 ; Peephole 145.a changed to add without carry
911 ; Peephole 145.b changed to add without carry
916 // 147: Fix compiler output to comply with 8051 instruction set.
920 ; Peephole 147.a changed target address mode r%1 to ar%1
927 ; Peephole 147.b changed target address mode r%1 to ar%1
934 ; Peephole 147.c changed target address mode r%1 to ar%1
944 ; Peephole 150.a removed misc moves via dpl before return
957 ; Peephole 150.b removed misc moves via dph, dpl before return
969 ; Peephole 150.c removed misc moves via dph, dpl before return
984 ; Peephole 150.d removed misc moves via dph, dpl, b before return
997 ; Peephole 150.e removed misc moves via dph, dpl, b before return
1011 ; Peephole 150.f removed misc moves via dph, dpl, b before return
1028 ; Peephole 150.g removed misc moves via dph, dpl, b, a before return
1043 ; Peephole 150.h removed misc moves via dph, dpl, b, a before return
1057 ; Peephole 150.i removed misc moves via dph, dpl, b, a before return
1062 // peephole 213.a might revert this
1067 ; Peephole 159 avoided xrl during execution
1076 ; Peephole 160.a removed sjmp by inverse jump logic
1079 } if labelRefCountChange(%1 -1)
1086 ; Peephole 160.b removed sjmp by inverse jump logic
1089 } if labelRefCountChange(%1 -1)
1096 ; Peephole 160.c removed sjmp by inverse jump logic
1099 } if labelRefCountChange(%1 -1)
1106 ; Peephole 160.d removed sjmp by inverse jump logic
1109 } if labelRefCountChange(%1 -1)
1116 ; Peephole 160.e removed sjmp by inverse jump logic
1119 } if labelRefCountChange(%1 -1)
1126 ; Peephole 160.f removed sjmp by inverse jump logic
1129 } if labelRefCountChange(%1 -1)
1138 ; Peephole 166 removed redundant mov
1139 } if notVolatile %1 %2
1146 ; Peephole 167 removed redundant bit moves (c not set to %1)
1155 ; Peephole 168 jump optimization
1158 } if labelRefCountChange(%2 -1)
1165 ; Peephole 169 jump optimization
1168 } if labelRefCountChange(%2 -1)
1177 ; Peephole 170 jump optimization
1180 } if labelRefCount(%3 1), labelRefCountChange(%3 -1)
1190 ; Peephole 171 jump optimization
1194 } if labelRefCount(%3 2), labelRefCountChange(%3 -2), labelRefCountChange(%4 1)
1205 ; Peephole 172 jump optimization
1210 } if labelRefCount(%3 3), labelRefCountChange(%3 -3), labelRefCountChange(%4 2)
1222 ; Peephole 173 jump optimization
1228 } if labelRefCount(%3 4), labelRefCountChange(%3 -4), labelRefCountChange(%4 3)
1238 ; Peephole 174.a optimized decrement (acc not set to %2, flags undefined)
1249 ; Peephole 174.b optimized increment (acc not set to %2, flags undefined)
1258 ; Peephole 174.c optimized increment, removed redundant mov
1263 // this one will screw assignes to volatile/sfr's
1269 ; Peephole 177.a removed redundant mov
1270 } if notVolatile %1 %2
1272 // applies to f.e. scott-add.asm (--model-large)
1278 ; Peephole 177.b removed redundant mov
1281 // applies to f.e. bug-408972.c
1286 ; Peephole 177.c removed redundant move
1288 } if notVolatile %1 %2
1290 // applies to f.e. bug-408972.c
1291 // not before peephole 177.c
1299 ; Peephole 177.d removed redundant move
1300 } if notVolatile(%1 %2),operandsNotRelated(%1 %2 %3)
1302 // applies to f.e. bug-607243.c
1303 // also check notVolatile %3, as it will return FALSE if it's @r%1
1308 ; peephole 177.e removed redundant move
1310 } if notVolatile %2 %3
1316 ; peephole 177.f removed redundant move
1324 ; peephole 177.g optimized mov sequence
1333 ; peephole 177.h optimized mov sequence
1343 ; Peephole 178 removed redundant mov
1348 // rules 179-182 provided by : Frieder <fe@lake.iup.uni-heidelberg.de>
1349 // saving 2 byte, 1 cycle
1354 ; Peephole 179 changed mov to clr
1360 // volatile xdata char t; t=0x01; t=0x03;
1370 ; Peephole 180.a removed redundant mov to dptr
1373 // volatile xdata char t; t=0x01; t=0x03; t=0x01;
1387 ; Peephole 180.b removed redundant mov to dptr
1390 // saving 1 byte, 0 cycles
1394 ; Peephole 181 changed mov to clr
1398 // saving 3 bytes, 2 cycles
1399 // provided by Bernhard Held <bernhard.held@de.westinghouse.com>
1404 ; Peephole 182.a used 16 bit load of DPTR
1408 // saving 3 byte, 2 cycles, return(NULL) profits here
1413 ; Peephole 182.b used 16 bit load of dptr
1417 // saving 3 byte, 2 cycles. Probably obsoleted by 182.b
1422 ; Peephole 182.c used 16 bit load of dptr
1423 mov dptr,#(((%2)<<8) + %1)
1426 // applies to return 0.0; in f.e. sincosf.c
1432 ; Peephole 182.d used 16 bit load of dptr
1433 mov dptr,#(%1&0x00ff)
1441 ; Peephole 183 avoided anl during execution
1450 ; Peephole 184 removed redundant mov
1456 // acc being incremented might cause problems
1460 ; Peephole 185 changed order of increment (acc incremented also!)
1465 // char indexed access to: long code table[] = {4,3,2,1};
1487 ; Peephole 186.a optimized movc sequence
1505 // char indexed access to: void* code table[] = {4,3,2,1};
1523 ; Peephole 186.b optimized movc sequence
1537 // char indexed access to: int code table[] = {4,3,2,1};
1551 ; Peephole 186.c optimized movc sequence
1560 // char indexed access to: char code table[] = {4,3,2,1};
1570 ; Peephole 186.d optimized movc sequence
1575 // char indexed access to: int code table[] = {4,3,2,1};
1590 ; Peephole 186.e optimized movc sequence (b, dptr differ)
1608 ; Peephole 187 used a instead of ar%1 for anl
1620 ; Peephole 188 removed redundant mov
1634 ; Peephole 189 removed redundant mov and anl
1637 // rules 190 & 191 need to be in order
1645 ; Peephole 190 removed redundant mov
1659 ; Peephole 191 removed redundant mov
1667 ; Peephole 192 used a instead of ar%1 as source
1683 ; Peephole 193.a optimized misc jump sequence
1693 } if labelRefCount(%3 4), labelRefCountChange(%3 -4), labelRefCountChange(%8 3)
1707 ; Peephole 193.b optimized misc jump sequence
1717 } if labelRefCount(%3 4), labelRefCountChange(%3 -4), labelRefCountChange(%8 3)
1731 ; Peephole 193.c optimized misc jump sequence
1741 } if labelRefCount(%3 4), labelRefCountChange(%3 -4), labelRefCountChange(%8 3)
1752 ; Peephole 194 optimized misc jump sequence
1759 } if labelRefCount(%3 4), labelRefCountChange(%3 -4), labelRefCountChange(%8 3)
1771 ; Peephole 195.a optimized misc jump sequence
1779 } if labelRefCount(%3 3), labelRefCountChange(%3 -3), labelRefCountChange(%8 2)
1791 ; Peephole 195.b optimized misc jump sequence
1799 } if labelRefCount(%3 3), labelRefCountChange(%3 -3), labelRefCountChange(%8 2)
1811 ; Peephole 195.c optimized misc jump sequence
1819 } if labelRefCount(%3 3), labelRefCountChange(%3 -3), labelRefCountChange(%8 2)
1829 ; Peephole 196 optimized misc jump sequence
1835 } if labelRefCount(%3 3), labelRefCountChange(%3 -3), labelRefCountChange(%8 2)
1845 ; Peephole 197.a optimized misc jump sequence
1851 } if labelRefCount(%3 2), labelRefCountChange(%3 -2), labelRefCountChange(%8 1)
1861 ; Peephole 197.b optimized misc jump sequence
1867 } if labelRefCount(%3 2), labelRefCountChange(%3 -2), labelRefCountChange(%8 1)
1877 ; Peephole 197.c optimized misc jump sequence
1883 } if labelRefCount(%3 2), labelRefCountChange(%3 -2), labelRefCountChange(%8 1)
1892 ; Peephole 198.a optimized misc jump sequence
1897 } if labelRefCount(%3 2), labelRefCountChange(%3 -2), labelRefCountChange(%8 1)
1905 ; Peephole 198.b optimized misc jump sequence
1909 } if labelRefCount(%3 1), labelRefCountChange(%3 -1)
1915 ; Peephole 200.a removed redundant sjmp
1917 } if labelRefCountChange(%1 -1)
1924 ; Peephole 200.b removed redundant sjmp
1927 } if labelRefCountChange(%1 -1)
1934 ; Peephole 202 removed redundant push pop
1943 ; Peephole 203 removed mov r%1,_spx
1952 ; Peephole 204 removed redundant mov
1964 ; Peephole 205 optimized misc jump sequence
1968 } if labelRefCount(%2 1), labelRefCountChange(%2 -1), labelRefCountChange(%3 -1)
1973 ; Peephole 206 removed redundant mov %1,%1
1981 ; Peephole 207 removed zero add (acc not set to %1, flags undefined)
1990 ; Peephole 208 removed redundant push pop
2000 ; Peephole 209 optimized increment (acc not set to %1, flags undefined)
2006 mov dptr,#((((%1 >> 8)) <<8) + %1)
2008 ; Peephole 210 simplified expression
2016 ; Peephole 211 removed redundant push %1 pop %1
2024 ; Peephole 212 reduced add sequence to inc
2029 // reverts peephole 159? asx8051 cannot handle, too complex?
2031 mov %1,#(( %2 >> 8 ) ^ 0x80)
2033 ; Peephole 213.a inserted fix
2039 mov %1,#(( %2 + %3 >> 8 ) ^ 0x80)
2041 ; Peephole 213.b inserted fix
2042 mov %1,#((%2 + %3) >> 8)
2053 ; Peephole 214 reduced some extra moves
2055 } if operandsNotSame
2062 ; Peephole 215 removed some moves
2065 } if operandsNotSame
2077 ; Peephole 216.a simplified clear (2 bytes)
2096 ; Peephole 216.b simplified clear (3 bytes)
2120 ; Peephole 216.c simplified clear (4 bytes)
2137 ; Peephole 219.a removed redundant clear
2158 ; Peephole 219.b removed redundant clear
2166 ; Peephole 220.a removed bogus DPS set
2174 ; Peephole 220.b removed bogus DPS set
2179 mov %1 + %2,(%2 + %1)
2181 ; Peephole 221.a remove redundant move
2185 mov (%1 + %2 + %3),((%2 + %1) + %3)
2187 ; Peephole 221.b remove redundant move
2194 ; Peephole 222 removed dec/inc pair
2205 ; Peephole 223.a removed redundant dph/dpl moves
2206 } if notVolatile %1 %2
2216 ; Peephole 223.b removed redundant dph/dpl moves
2232 ; Peephole 225 removed redundant move to acc
2244 ; Peephole 226.a removed unnecessary clr
2260 ; Peephole 226.b removed unnecessary clr
2279 ; Peephole 227.a replaced inefficient 32 bit clear
2306 ; Peephole 227.b replaced inefficient 32 constant
2329 ; Peephole 227.c replaced inefficient 16 bit clear
2346 ; Peephole 227.d replaced inefficient 16 bit constant
2355 // this last peephole often removes the last mov from 227.a - 227.d
2360 ; Peephole 227.e removed redundant mov to dptr
2367 ; Peephole 232 using movc to read xdata (--xram-movc)
2375 ; Peephole 233 using _gptrgetc instead of _gptrget (--xram-movc)
2385 ; Peephole 234.a loading dpl directly from a(ccumulator), r%1 not set
2398 ; Peephole 234.b loading dph directly from a(ccumulator), r%1 not set
2405 // 14 rules by Fiorenzo D. Ramaglia <fd.ramaglia@tin.it>
2410 ; Peephole 236.a used r%1 instead of ar%1
2417 ; Peephole 236.b used r%1 instead of ar%1
2424 ; Peephole 236.c used r%1 instead of ar%1
2431 ; Peephole 236.d used r%1 instead of ar%1
2438 ; Peephole 236.e used r%1 instead of ar%1
2445 ; Peephole 236.f used r%1 instead of ar%1
2452 ; Peephole 236.g used r%1 instead of ar%1
2459 ; Peephole 236.h used r%1 instead of ar%1
2466 ; Peephole 236.i used r%1 instead of ar%1
2473 ; Peephole 236.j used r%1 instead of ar%1
2480 ; Peephole 236.k used r%1 instead of ar%1
2487 ; Peephole 236.l used r%1 instead of ar%1
2494 ; Peephole 236.m used r%1 instead of ar%1
2501 ; Peephole 236.n used r%1 instead of ar%1
2512 ; Peephole 237.a removed sjmp to ret
2518 } if labelRefCountChange(%1 -1)
2529 ; Peephole 237.b removed sjmp to ret
2537 } if labelRefCountChange(%1 -1)
2539 // applies to f.e. device/lib/log10f.c
2565 ; Peephole 238.a removed 4 redundant moves
2566 } if operandsNotSame8 %1 %2 %3 %4 %5 %6 %7 %8
2568 // applies to device/lib/log10f.c
2583 ; Peephole 238.b removed 3 redundant moves
2584 } if operandsNotSame7 %1 %2 %3 %4 %5 %6 %7
2586 // applies to f.e. device/lib/time.c
2602 ; Peephole 238.c removed 2 redundant moves
2603 } if operandsNotSame4 %1 %2 %3 %4
2605 // applies to f.e. support/regression/tests/bug-524209.c
2618 ; Peephole 238.d removed 3 redundant moves
2619 } if operandsNotSame6 %1 %2 %3 %4 %5 %6
2621 // applies to f.e. ser_ir.asm
2625 ; Peephole 239 used a instead of acc
2633 ; Peephole 240 use clr instead of addc a,#0
2638 // peepholes 241.a to 241.d and 241.e to 241.h need to be in order
2650 ; Peephole 241.a optimized compare
2659 } if labelRefCountChange(%1 -1)
2661 // applies to generic pointer compare
2672 ; Peephole 241.b optimized compare
2680 } if labelRefCountChange(%1 -1)
2682 // applies to f.e. time.c
2692 ; Peephole 241.c optimized compare
2699 } if labelRefCountChange(%1 -1)
2701 // applies to f.e. malloc.c
2710 ; Peephole 241.d optimized compare
2716 } if labelRefCountChange(%1 -1)
2718 // applies to f.e. j = (k!=0x1000);
2719 // with volatile idata long k;
2734 ; Peephole 241.e optimized compare
2746 } if labelRefCountChange(%2 -1)
2748 // applies to f.e. j = (p!=NULL);
2749 // with volatile idata char *p;
2762 ; Peephole 241.f optimized compare
2772 } if labelRefCountChange(%2 -1)
2774 // applies to f.e. j = (k!=0x1000);
2775 // with volatile idata int k;
2786 ; Peephole 241.g optimized compare
2794 } if labelRefCountChange(%2 -1)
2796 // applies to f.e. vprintf.asm (--stack-auto)
2805 ; Peephole 241.h optimized compare
2811 } if labelRefCountChange(%2 -1)
2813 // applies to f.e. scott-bool1.c
2822 ; Peephole 242.a avoided branch jnz to jz
2825 } if labelRefCount %1 1
2827 // applies to f.e. scott-bool1.c
2838 ; Peephole 242.b avoided branch jnz to jz
2841 } if labelRefCount %1 1
2843 // applies to f.e. logic.c
2858 ; Peephole 242.c avoided branch jnz to jz
2861 } if labelRefCount %1 1
2863 // applies to f.e. vprintf.c
2864 // this is a rare case, usually the "tail increment" is noticed earlier
2871 ; Peephole 243 avoided branch to sjmp
2876 } if labelInRange(), labelRefCountChange(%3 -1), labelRefCountChange(%5 1)
2878 // applies to f.e. simplefloat.c (saving 1 cycle)
2883 ; Peephole 244.a moving first to a instead of r%1
2888 // applies to f.e. _itoa.c (saving 1 cycle)
2893 ; Peephole 244.b moving first to a instead of r%1
2899 // applies to f.e. bug-460010.c (saving 1 cycle)
2905 ; Peephole 244.c loading dpl from a instead of r%1
2914 ; Peephole 244.d loading dph from a instead of r%1
2918 // this one is safe but disables 245.a 245.b
2919 // please remove 245 if 245.a 245.b are found to be safe
2920 // applies to f.e. scott-compare.c
2931 ; Peephole 245 optimized complement (r%1 and acc set needed?)
2936 } if labelRefCount(%2 1), labelRefCountChange(%2 -1)
2938 // this one will not be triggered if 245 is present
2939 // please remove 245 if 245.a 245.b are found to be safe
2940 // applies to f.e. vprintf.c
2952 ; Peephole 245.a optimized conditional jump (r%1 and acc not set!)
2954 } if labelRefCount(%2 1), labelRefCountChange(%2 -1)
2956 // this one will not be triggered if 245 is present
2957 // please remove 245 if 245.a 245.b are found to be safe
2958 // applies to f.e. scott-compare.c
2970 ; Peephole 245.b optimized conditional jump (r%1 and acc not set!)
2972 } if labelRefCount(%2 1), labelRefCountChange(%2 -1)
2975 // rules 246.x apply to f.e. bitfields.c
2988 ; Peephole 246.a combined clr/clr
3005 ; Peephole 246.b combined set/set
3023 ; Peephole 246.c combined set/clr
3041 ; Peephole 246.d combined clr/set
3060 ; Peephole 246.e combined set/clr/clr
3080 ; Peephole 246.f combined set/clr/set
3100 ; Peephole 246.g combined clr/set/clr
3119 ; Peephole 246.h combined clr/set/set
3125 // rules 247.x apply to f.e. bitfields.c
3138 ; Peephole 247.a combined clr/clr
3155 ; Peephole 247.b combined set/set
3173 ; Peephole 247.c combined set/clr
3191 ; Peephole 247.d combined clr/set
3210 ; Peephole 247.e combined set/clr/clr
3230 ; Peephole 247.f combined set/clr/set
3250 ; Peephole 247.g combined clr/set/clr
3269 ; Peephole 247.h combined clr/set/set
3275 // Peepholes 248.x have to be compatible with the keyword volatile.
3276 // They optimize typical accesses to memory mapped I/O devices:
3277 // volatile xdata char t; t|=0x01;
3290 ; Peephole 248.a optimized or to xdata
3295 // volatile xdata char t; t&=0x01;
3308 ; Peephole 248.b optimized and to xdata
3313 // volatile xdata char t; t^=0x01;
3326 ; Peephole 248.c optimized xor to xdata
3331 // volatile xdata char t; t|=0x01; t&=~0x01; t|=0x01;
3353 ; Peephole 248.d optimized or/and/or to volatile xdata
3365 // volatile xdata char t; t&=~0x01; t|=0x01; t&=~0x01;
3387 ; Peephole 248.e optimized and/or/and to volatile xdata
3399 // volatile xdata char t; t|=0x01; t&=~0x01;
3415 ; Peephole 248.f optimized or/and to volatile xdata
3424 // volatile xdata char t; t&=~0x01; t|=0x01;
3440 ; Peephole 248.g optimized and/or to volatile xdata
3449 // volatile xdata char t; t^=0x01; t^=0x01;
3465 ; Peephole 248.h optimized xor/xor to volatile xdata
3474 // Peeepholes 248.i to 248.m are like 248.d to 248.h except they apply to bitfields:
3475 // xdata struct { unsigned b0:1; unsigned b1:1; unsigned b2:1; } xport;
3476 // xport.b0=1; xport.b0=0; xport.b0=1;
3497 ; Peephole 248.i optimized or/and/or to xdata bitfield
3526 ; Peephole 248.j optimized and/or/and to xdata bitfield
3550 ; Peephole 248.k optimized or/and to xdata bitfield
3571 ; Peephole 248.l optimized and/or to xdata bitfield
3592 ; Peephole 248.m optimized xor/xor to xdata bitfield
3603 ; Peephole 249.a jump optimization
3604 } if labelRefCount(%1 1), labelRefCountChange(%1 -1)
3610 ; Peephole 249.b jump optimization
3611 } if labelRefCount(%1 1), labelRefCountChange(%1 -1)
3614 // This allows non-interrupt and interrupt code to safely compete
3615 // for a resource without the non-interrupt code having to disable
3617 // volatile bit resource_is_free;
3618 // if( resource_is_free ) {
3619 // resource_is_free=0; do_something; resource_is_free=1;
3626 ; Peephole 250.a using atomic test and clear
3630 } if labelRefCount(%3 0), labelRefCountChange(%3 1)
3638 ; Peephole 250.b using atomic test and clear
3642 } if labelRefCount %2 1
3645 // not before peephole 250.b
3649 ; Peephole 251.a replaced ljmp to ret with ret
3651 } if labelIsReturnOnly(), labelRefCountChange(%5 -1)
3653 // not before peephole 250.b
3657 ; Peephole 251.b replaced sjmp to ret with ret
3659 } if labelIsReturnOnly(), labelRefCountChange(%5 -1)
3661 // applies to shifts.c and when accessing arrays with an unsigned integer index
3662 // saving 1 byte, 2 cycles
3672 ; Peephole 252 optimized left shift
3681 // applies to: void test( char c ) { if( c ) func1(); else func2(); }
3686 ; Peephole 253.a replaced lcall/ret with ljmp
3690 // applies to: void test( char c ) { if( c ) func1(); else func2(); }
3696 ; Peephole 253.b replaced lcall/ret with ljmp
3699 } if labelRefCount %2 0
3701 // applies to f.e. scott-bool1.c
3707 ; Peephole 253.c replaced lcall with ljmp
3714 // applies to f.e. funptrs.c
3715 // saves one byte if %1 is a register or @register
3721 ; Peephole 254 optimized left shift
3725 // applies to f.e. switch.c
3738 ; Peephole 255 optimized jump table index calculation
3740 cjne a,#(%1+0x01),.+1
3749 // applies to f.e. jump tables and scott-bool1.c.
3750 // similar peepholes can be constructed for other instructions
3751 // after which a flag or a register is known (like: djnz, cjne, jnc)
3759 ; Peephole 256.a removed redundant clr c
3760 } if labelRefCount %2 0
3762 // applies to f.e. logf.c
3770 ; Peephole 256.b removed redundant clr a
3771 } if labelRefCount %2 0
3773 // applies to f.e. bug-905492.c
3781 ; Peephole 256.c loading %3 with zero from a
3783 } if labelRefCount %2 0
3785 // applies to f.e. malloc.c
3795 ; Peephole 256.d loading %3 with zero from a
3797 } if labelRefCount(%2 0),operandsNotRelated('a' %4)
3810 ; Peephole 256.e loading %3 with zero from a
3812 } if labelRefCount(%2 0),operandsNotRelated('a' %4 %6)
3827 ; Peephole 256.f loading %2 with zero from a
3829 } if labelRefCount(%2 0),operandsNotRelated('a' %4 %6 %8)
3832 // unsigned char i=8; do{ } while(--i != 0);
3833 // this currently only applies if i is kept in a register
3838 ; Peephole 257 optimized decrement with compare
3843 // in_byte<<=1; if(in_bit) in_byte|=1;
3844 // helps f.e. reading data on a 3-wire (SPI) bus
3855 ; Peephole 258.a optimized bitbanging
3861 } if notVolatile(%1), labelRefCountChange(%3 -1)
3863 // in_byte<<=1; if(in_bit) in_byte|=1;
3874 ; Peephole 258.b optimized bitbanging
3880 } if labelRefCountChange(%3 -1)
3882 // in_byte>>=1; if(in_bit) in_byte|=0x80;
3894 ; Peephole 258.c optimized bitbanging
3900 } if notVolatile(%1), labelRefCountChange(%3 -1)
3902 // in_byte>>=1; if(in_bit) in_byte|=0x80;
3914 ; Peephole 258.d optimized bitbanging
3920 } if labelRefCountChange(%3 -1)
3922 // out_bit=out_byte&0x80; out_byte<<=1;
3923 // helps f.e. writing data on a 3-wire (SPI) bus
3933 ; Peephole 258.e optimized bitbanging
3939 // out_bit=out_byte&0x01; out_byte>>=1;
3950 ; Peephole 258.f optimized bitbanging
3957 // Peepholes 259.x rely on the correct labelRefCount. Otherwise they are
3958 // not compatible with peepholes 250.x
3959 // Peepholes 250.x add jumps to a previously unused label. If the
3960 // labelRefCount is not increased, peepholes 259.x are (mistakenly) applied.
3961 // (Mail on sdcc-devel 2004-10-25)
3963 // applies to f.e. vprintf.c
3970 ; Peephole 259.a removed redundant label %2 and ret
3972 } if labelRefCount %2 0
3974 // applies to f.e. gets.c
3981 ; Peephole 259.b removed redundant label %2 and ret
3983 } if labelRefCount %2 0
3985 // optimizing jumptables
3986 // Please note: to enable peephole 260.x you currently have to set
3987 // the environment variable SDCC_SJMP_JUMPTABLE
3999 ; Peephole 260.a used sjmp in jumptable
4010 // optimizing jumptables
4023 ; Peephole 260.b used sjmp in jumptable
4035 // optimizing jumptables
4049 ; Peephole 260.c used sjmp in jumptable
4062 // optimizing jumptables
4077 ; Peephole 260.d used sjmp in jumptable
4091 // optimizing jumptables
4107 ; Peephole 260.e used sjmp in jumptable
4122 // optimizing jumptables
4140 ; Peephole 260.f used sjmp in jumptable
4157 // optimizing jumptables
4176 ; Peephole 260.g used sjmp in jumptable
4194 // optimizing jumptables
4214 ; Peephole 260.h used sjmp in jumptable
4233 // optimizing jumptables
4254 ; Peephole 260.i used sjmp in jumptable
4274 // optimizing jumptables
4296 ; Peephole 260.j used sjmp in jumptable
4317 // optimizing jumptables
4340 ; Peephole 260.k used sjmp in jumptable
4362 // optimizing jumptables
4386 ; Peephole 260.l used sjmp in jumptable
4409 // optimizing jumptables
4434 ; Peephole 260.m used sjmp in jumptable
4458 // applies to: a = (a << 1) | (a >> 15);
4472 ; Peephole 261.a optimized left rol
4480 // applies to: a = (a << 15) | (a >> 1);
4494 ; Peephole 261.b optimized right rol
4506 ; Peephole 262 removed redundant cpl c
4515 ; Peephole 263.a optimized loading const
4524 ; Peephole 263.b optimized loading const
4532 ; Peephole 263.c optimized loading const
4544 ; Peephole 264 jump optimization (acc not set)
4547 } if labelRefCount(%3 1), labelRefCountChange(%3 -1)
4549 // should be one of the last peepholes
4553 ; Peephole 300 removed redundant label %1
4554 } if labelRefCount(%1 0)