1 // added by Jean Louis VERN for
7 ; Peephole 2.a removed redundant xch xch
15 ; Peephole 3.a changed mov to clr
25 ; Peephole 3.b changed mov to clr
31 // saving 1 byte, loosing 1 cycle but maybe allowing peephole 3.b to start
36 ; Peephole 3.c changed mov to clr
52 ; Peephole 3.d removed redundant clr
66 ; Peephole 3.e removed redundant clr
82 ; Peephole 3.f removed redundant clr
100 ; Peephole 3.g removed redundant clr
112 ; Peephole 3.h changed mov %3,#0x00 to ...,a
127 ; Peephole 3.i changed mov %4,#0x00 to ...,a
144 ; Peephole 3.j changed mov %5,#0x00 to ...,a
163 ; Peephole 3.k changed mov %6,#0x00 to ...,a
175 ; Peephole 100 removed redundant mov
179 // applies to f.e. lib/src/time.c (--model-large)
196 ; Peephole 101.a removed redundant moves
204 // applies to f.e. support/regression/tests/literalop.c (--model-large)
218 ; Peephole 101.b removed redundant moves
224 // applies to f.e. support/regression/tests/onebyte.c (--model-large)
235 ; Peephole 101.c removed redundant mov
250 ; Peephole 102 removed redundant mov to %1
259 } if notVolatile(%1), labelRefCount(%3 1)
272 ; Peephole 103 removed redundant mov to %1
281 } if labelRefCount(%3 1)
283 // Does not seem to be triggered anymore
290 // ; Peephole 104 optimized increment (acc not set to r%1, flags undefined)
300 ; Peephole 105 removed redundant mov
310 ; Peephole 106 removed redundant mov
317 ; Peephole 107 removed redundant ljmp
319 } if labelRefCountChange(%1 -1)
326 ; Peephole 108.a removed ljmp by inverse jump logic
329 } if labelInRange(), labelRefCountChange(%1 -1)
336 ; Peephole 108.b removed ljmp by inverse jump logic
339 } if labelInRange(), labelRefCountChange(%1 -1)
346 ; Peephole 108.c removed ljmp by inverse jump logic
349 } if labelInRange(), labelRefCountChange(%1 -1)
356 ; Peephole 108.d removed ljmp by inverse jump logic
359 } if labelInRange(), labelRefCountChange(%2 -1)
366 ; Peephole 108.e removed ljmp by inverse jump logic
369 } if labelInRange(), labelRefCountChange(%2 -1)
375 ; Peephole 112.b changed ljmp to sjmp
388 ; Peephole 113.a optimized misc sequence
393 } if labelRefCount %3 1
404 ; Peephole 113.b optimized misc sequence
410 } if labelRefCount %3 2
419 ; Peephole 115.a jump optimization (acc not set)
423 } if labelRefCount %3 1
432 ; Peephole 115.b jump optimization
435 } if labelRefCountChange(%2 -1)
445 ; Peephole 115.c jump optimization (acc not set)
450 } if labelRefCount %3 2
461 ; Peephole 115.d jump optimization (acc not set)
467 } if labelRefCount %3 3
479 ; Peephole 115.e jump optimization (acc not set)
486 } if labelRefCount %3 4
495 ; Peephole 115.f jump optimization (acc not set)
498 } if labelRefCount(%3 1), labelRefCountChange(%3 -1)
508 ; Peephole 115.g jump optimization (acc not set)
512 } if labelRefCount(%3 2), labelRefCountChange(%3 -2), labelRefCountChange(%4 1)
523 ; Peephole 115.h jump optimization (acc not set)
528 } if labelRefCount(%3 3), labelRefCountChange(%3 -3), labelRefCountChange(%4 2)
540 ; Peephole 115.i jump optimization (acc not set)
546 } if labelRefCount(%3 4), labelRefCountChange(%3 -4), labelRefCountChange(%4 3)
555 ; Peephole 115.j jump optimization (acc not set)
559 } if labelRefCount %3 1
569 ; Peephole 115.k jump optimization (acc not set)
574 } if labelRefCount %3 2
585 ; Peephole 115.l jump optimization (acc not set)
591 } if labelRefCount %3 3
603 ; Peephole 115.m jump optimization (acc not set)
610 } if labelRefCount %3 4
623 ; Peephole 127 removed misc sequence
625 } if labelRefCount %3 0
632 ; Peephole 128 jump optimization
636 // applies to: bug-524691.c --model-large: while (uRight - uLeft > 1)
642 ; Peephole 129.a jump optimization
646 // applies to: _fsdiv.c --xstack: if (mant1 < mant2)
653 ; Peephole 129.b optimized condition
658 // applies to: time.c --xstack: while((days += (LEAP_YEAR(year) ? 366 : 365)) <= epoch)
666 ; Peephole 129.c optimized condition
670 } if notVolatile %1 %2
672 // applies to: _memmove.c --xstack: if (((int)src < (int)dst) && ((((int)src)+acount) > (int)dst))
681 ; Peephole 129.d optimized condition
686 } if notVolatile %1 %2 %3
691 ; Peephole 130 changed target address mode r%1 to ar%1
701 ; Peephole 131 optimized decrement (not caring for c)
706 // ideally the optimizations of rules 132.x should be done in genCmpXX
713 ; Peephole 132.a optimized genCmpGt by inverse logic (acc differs)
717 } if operandsLiteral(%1)
725 ; Peephole 132.b optimized genCmpGt by inverse logic (acc differs)
729 } if operandsLiteral(%1)
737 ; Peephole 132.c optimized genCmpGt by inverse logic (acc differs)
741 } if operandsLiteral(%1)
749 ; Peephole 132.d optimized genCmpGt by inverse logic
753 } if operandsNotRelated('0x00' %2), operandsLiteral(%2)
761 ; Peephole 132.e optimized genCmpLt by inverse logic (carry differs)
765 } if operandsNotRelated('0x00' %2), operandsLiteral(%2)
773 ; Peephole 132.f optimized genCmpLt by inverse logic (carry differs)
777 } if operandsNotRelated('0x00' %2), operandsLiteral(%2)
788 ; Peephole 133 removed redundant moves
801 ; Peephole 134 removed redundant moves
812 ; Peephole 135 removed redundant mov
825 ; Peephole 136 removed redundant mov
828 // WTF? Doesn't look sensible to me...
838 // ; Peephole 137 optimized misc jump sequence
842 //} if labelRefCount %4 1
853 // ; Peephole 138 optimized misc jump sequence
858 //} if labelRefCount %4 1
865 ; Peephole 139.a removed redundant mov
875 ; Peephole 139.b removed redundant mov
885 ; Peephole 139.c removed redundant mov
890 // applies to genlshOne
897 ; Peephole 140 removed redundant mov
908 ; Peephole 142 removed redundant mov
917 ; Peephole 143.a converted rlc to rl
925 ; Peephole 143.b converted rrc to rc
933 ; Peephole 145.a changed to add without carry
942 ; Peephole 145.b changed to add without carry
947 // 147: Fix compiler output to comply with 8051 instruction set.
951 ; Peephole 147.a changed target address mode r%1 to ar%1
958 ; Peephole 147.b changed target address mode r%1 to ar%1
965 ; Peephole 147.c changed target address mode r%1 to ar%1
975 ; Peephole 150.a removed misc moves via dpl before return
988 ; Peephole 150.b removed misc moves via dph, dpl before return
1000 ; Peephole 150.c removed misc moves via dph, dpl before return
1015 ; Peephole 150.d removed misc moves via dph, dpl, b before return
1028 ; Peephole 150.e removed misc moves via dph, dpl, b before return
1042 ; Peephole 150.f removed misc moves via dph, dpl, b before return
1059 ; Peephole 150.g removed misc moves via dph, dpl, b, a before return
1074 ; Peephole 150.h removed misc moves via dph, dpl, b, a before return
1088 ; Peephole 150.i removed misc moves via dph, dpl, b, a before return
1093 // peephole 213.a might revert this
1098 ; Peephole 159 avoided xrl during execution
1107 ; Peephole 160.a removed sjmp by inverse jump logic
1110 } if labelRefCountChange(%1 -1)
1117 ; Peephole 160.b removed sjmp by inverse jump logic
1120 } if labelRefCountChange(%1 -1)
1127 ; Peephole 160.c removed sjmp by inverse jump logic
1130 } if labelRefCountChange(%1 -1)
1137 ; Peephole 160.d removed sjmp by inverse jump logic
1140 } if labelRefCountChange(%1 -1)
1147 ; Peephole 160.e removed sjmp by inverse jump logic
1150 } if labelRefCountChange(%1 -1)
1157 ; Peephole 160.f removed sjmp by inverse jump logic
1160 } if labelRefCountChange(%1 -1)
1169 ; Peephole 166 removed redundant mov
1170 } if notVolatile %1 %2
1177 ; Peephole 167 removed redundant bit moves (c not set to %1)
1186 ; Peephole 168 jump optimization
1189 } if labelRefCountChange(%2 -1)
1196 ; Peephole 169 jump optimization
1199 } if labelRefCountChange(%2 -1)
1208 ; Peephole 170 jump optimization
1211 } if labelRefCount(%3 1), labelRefCountChange(%3 -1)
1221 ; Peephole 171 jump optimization
1225 } if labelRefCount(%3 2), labelRefCountChange(%3 -2), labelRefCountChange(%4 1)
1236 ; Peephole 172 jump optimization
1241 } if labelRefCount(%3 3), labelRefCountChange(%3 -3), labelRefCountChange(%4 2)
1253 ; Peephole 173 jump optimization
1259 } if labelRefCount(%3 4), labelRefCountChange(%3 -4), labelRefCountChange(%4 3)
1269 ; Peephole 174.a optimized decrement (acc not set to %2, flags undefined)
1280 ; Peephole 174.b optimized increment (acc not set to %2, flags undefined)
1289 ; Peephole 174.c optimized increment, removed redundant mov
1294 // this one will screw assignes to volatile/sfr's
1300 ; Peephole 177.a removed redundant mov
1301 } if notVolatile %1 %2
1303 // applies to f.e. scott-add.asm (--model-large)
1309 ; Peephole 177.b removed redundant mov
1312 // applies to f.e. bug-408972.c
1317 ; Peephole 177.c removed redundant mov
1319 } if notVolatile %1 %2
1321 // applies to f.e. bug-408972.c
1322 // not before peephole 177.c
1330 ; Peephole 177.d removed redundant mov
1331 } if notVolatile(%1 %2),operandsNotRelated(%1 %2 %3)
1333 // applies to f.e. bug-607243.c
1334 // also check notVolatile %3, as it will return FALSE if it's @r%1
1339 ; peephole 177.e removed redundant mov
1341 } if notVolatile %2 %3
1347 ; peephole 177.f removed redundant mov
1355 ; peephole 177.g optimized mov sequence
1364 ; peephole 177.h optimized mov sequence
1374 ; Peephole 178 removed redundant mov
1379 // rules 179-182 provided by : Frieder <fe@lake.iup.uni-heidelberg.de>
1380 // saving 2 byte, 1 cycle
1385 ; Peephole 179 changed mov to clr
1391 // volatile xdata char t; t=0x01; t=0x03;
1401 ; Peephole 180.a removed redundant mov to dptr
1404 // volatile xdata char t; t=0x01; t=0x03; t=0x01;
1418 ; Peephole 180.b removed redundant mov to dptr
1421 // saving 1 byte, 0 cycles
1425 ; Peephole 181 changed mov to clr
1429 // saving 3 bytes, 2 cycles
1430 // provided by Bernhard Held <bernhard.held@de.westinghouse.com>
1435 ; Peephole 182.a used 16 bit load of DPTR
1439 // saving 3 byte, 2 cycles, return(NULL) profits here
1444 ; Peephole 182.b used 16 bit load of dptr
1448 // saving 3 byte, 2 cycles. Probably obsoleted by 182.b
1453 ; Peephole 182.c used 16 bit load of dptr
1454 mov dptr,#(((%2)<<8) + %1)
1457 // applies to return 0.0; in f.e. sincosf.c
1463 ; Peephole 182.d used 16 bit load of dptr
1464 mov dptr,#(%1&0x00ff)
1472 ; Peephole 183 avoided anl during execution
1481 ; Peephole 184 removed redundant mov
1487 // acc being incremented might cause problems
1491 ; Peephole 185 changed order of increment (acc incremented also!)
1496 // char indexed access to: long code table[] = {4,3,2,1};
1518 ; Peephole 186.a optimized movc sequence
1536 // char indexed access to: void* code table[] = {4,3,2,1};
1554 ; Peephole 186.b optimized movc sequence
1568 // char indexed access to: int code table[] = {4,3,2,1};
1582 ; Peephole 186.c optimized movc sequence
1591 // char indexed access to: char code table[] = {4,3,2,1};
1601 ; Peephole 186.d optimized movc sequence
1606 // char indexed access to: int code table[] = {4,3,2,1};
1621 ; Peephole 186.e optimized movc sequence (b, dptr differ)
1639 ; Peephole 187 used a instead of ar%1 for anl
1651 ; Peephole 188 removed redundant mov
1665 ; Peephole 189 removed redundant mov and anl
1668 // rules 190 & 191 need to be in order
1676 ; Peephole 190 removed redundant mov
1690 ; Peephole 191 removed redundant mov
1698 ; Peephole 192 used a instead of ar%1 as source
1714 ; Peephole 193.a optimized misc jump sequence
1724 } if labelRefCount(%3 4), labelRefCountChange(%3 -4), labelRefCountChange(%8 3)
1738 ; Peephole 193.b optimized misc jump sequence
1748 } if labelRefCount(%3 4), labelRefCountChange(%3 -4), labelRefCountChange(%8 3)
1762 ; Peephole 193.c optimized misc jump sequence
1772 } if labelRefCount(%3 4), labelRefCountChange(%3 -4), labelRefCountChange(%8 3)
1783 ; Peephole 194 optimized misc jump sequence
1790 } if labelRefCount(%3 4), labelRefCountChange(%3 -4), labelRefCountChange(%8 3)
1802 ; Peephole 195.a optimized misc jump sequence
1810 } if labelRefCount(%3 3), labelRefCountChange(%3 -3), labelRefCountChange(%8 2)
1822 ; Peephole 195.b optimized misc jump sequence
1830 } if labelRefCount(%3 3), labelRefCountChange(%3 -3), labelRefCountChange(%8 2)
1842 ; Peephole 195.c optimized misc jump sequence
1850 } if labelRefCount(%3 3), labelRefCountChange(%3 -3), labelRefCountChange(%8 2)
1860 ; Peephole 196 optimized misc jump sequence
1866 } if labelRefCount(%3 3), labelRefCountChange(%3 -3), labelRefCountChange(%8 2)
1876 ; Peephole 197.a optimized misc jump sequence
1882 } if labelRefCount(%3 2), labelRefCountChange(%3 -2), labelRefCountChange(%8 1)
1892 ; Peephole 197.b optimized misc jump sequence
1898 } if labelRefCount(%3 2), labelRefCountChange(%3 -2), labelRefCountChange(%8 1)
1908 ; Peephole 197.c optimized misc jump sequence
1914 } if labelRefCount(%3 2), labelRefCountChange(%3 -2), labelRefCountChange(%8 1)
1923 ; Peephole 198.a optimized misc jump sequence
1928 } if labelRefCount(%3 2), labelRefCountChange(%3 -2), labelRefCountChange(%8 1)
1936 ; Peephole 198.b optimized misc jump sequence
1940 } if labelRefCount(%3 1), labelRefCountChange(%3 -1)
1946 ; Peephole 200.a removed redundant sjmp
1948 } if labelRefCountChange(%1 -1)
1955 ; Peephole 200.b removed redundant sjmp
1958 } if labelRefCountChange(%1 -1)
1965 ; Peephole 202 removed redundant push pop
1974 ; Peephole 203 removed mov r%1,_spx
1983 ; Peephole 204 removed redundant mov
1995 ; Peephole 205 optimized misc jump sequence
1999 } if labelRefCount(%2 1), labelRefCountChange(%2 -1), labelRefCountChange(%3 -1)
2004 ; Peephole 206 removed redundant mov %1,%1
2007 // Does not seem to be triggered anymore
2013 // ; Peephole 207 removed zero add (acc not set to %1, flags undefined)
2022 ; Peephole 208 removed redundant push pop
2026 // Does not seem to be triggered anymore
2033 // ; Peephole 209 optimized increment (acc not set to %1, flags undefined)
2039 mov dptr,#((((%1 >> 8)) <<8) + %1)
2041 ; Peephole 210 simplified expression
2049 ; Peephole 211 removed redundant push %1 pop %1
2052 // Does not seem to be triggered anymore
2058 // ; Peephole 212 reduced add sequence to inc
2063 // reverts peephole 159? asx8051 cannot handle, too complex?
2065 mov %1,#(( %2 >> 8 ) ^ 0x80)
2067 ; Peephole 213.a inserted fix
2073 mov %1,#(( %2 + %3 >> 8 ) ^ 0x80)
2075 ; Peephole 213.b inserted fix
2076 mov %1,#((%2 + %3) >> 8)
2087 ; Peephole 214.a removed redundant mov
2089 } if operandsNotSame
2096 ; Peephole 214.b removed redundant mov
2099 } if operandsNotSame
2111 ; Peephole 216.a simplified clear (2 bytes)
2130 ; Peephole 216.b simplified clear (3 bytes)
2154 ; Peephole 216.c simplified clear (4 bytes)
2171 ; Peephole 219.a removed redundant clear
2192 ; Peephole 219.b removed redundant clear
2200 ; Peephole 220.a removed bogus DPS set
2208 ; Peephole 220.b removed bogus DPS set
2213 mov %1 + %2,(%2 + %1)
2215 ; Peephole 221.a remove redundant mov
2219 mov (%1 + %2 + %3),((%2 + %1) + %3)
2221 ; Peephole 221.b remove redundant mov
2228 ; Peephole 222 removed dec/inc pair
2239 ; Peephole 223.a removed redundant dph/dpl moves
2240 } if notVolatile %1 %2
2250 ; Peephole 223.b removed redundant dph/dpl moves
2266 ; Peephole 225 removed redundant move to acc
2278 ; Peephole 226.a removed unnecessary clr
2294 ; Peephole 226.b removed unnecessary clr
2313 ; Peephole 227.a replaced inefficient 32 bit clear
2340 ; Peephole 227.b replaced inefficient 32 constant
2363 ; Peephole 227.c replaced inefficient 16 bit clear
2380 ; Peephole 227.d replaced inefficient 16 bit constant
2389 // this last peephole often removes the last mov from 227.a - 227.d
2394 ; Peephole 227.e removed redundant mov to dptr
2401 ; Peephole 232 using movc to read xdata (--xram-movc)
2409 ; Peephole 233 using _gptrgetc instead of _gptrget (--xram-movc)
2419 ; Peephole 234.a loading dpl directly from a(ccumulator), r%1 not set
2432 ; Peephole 234.b loading dph directly from a(ccumulator), r%1 not set
2439 // 14 rules by Fiorenzo D. Ramaglia <fd.ramaglia@tin.it>
2444 ; Peephole 236.a used r%1 instead of ar%1
2451 ; Peephole 236.b used r%1 instead of ar%1
2458 ; Peephole 236.c used r%1 instead of ar%1
2465 ; Peephole 236.d used r%1 instead of ar%1
2472 ; Peephole 236.e used r%1 instead of ar%1
2479 ; Peephole 236.f used r%1 instead of ar%1
2486 ; Peephole 236.g used r%1 instead of ar%1
2493 ; Peephole 236.h used r%1 instead of ar%1
2500 ; Peephole 236.i used r%1 instead of ar%1
2507 ; Peephole 236.j used r%1 instead of ar%1
2514 ; Peephole 236.k used r%1 instead of ar%1
2521 ; Peephole 236.l used r%1 instead of ar%1
2528 ; Peephole 236.m used r%1 instead of ar%1
2535 ; Peephole 236.n used r%1 instead of ar%1
2546 ; Peephole 237.a removed sjmp to ret
2552 } if labelRefCountChange(%1 -1)
2563 ; Peephole 237.b removed sjmp to ret
2571 } if labelRefCountChange(%1 -1)
2573 // applies to f.e. device/lib/log10f.c
2599 ; Peephole 238.a removed 4 redundant moves
2600 } if operandsNotSame8(%1 %2 %3 %4 %5 %6 %7 %8), notVolatile(%1 %2 %3 %4 %9 %10 %11 %12)
2602 // applies to device/lib/log10f.c
2617 ; Peephole 238.b removed 3 redundant moves
2618 } if operandsNotSame7(%1 %2 %3 %4 %5 %6 %7), notVolatile(%1 %2 %3 %5 %6 %7)
2620 // applies to f.e. device/lib/time.c
2636 ; Peephole 238.c removed 2 redundant moves
2637 } if operandsNotSame4(%1 %2 %3 %4), notVolatile(%1 %2 %5 %6)
2639 // applies to f.e. support/regression/tests/bug-524209.c
2652 ; Peephole 238.d removed 3 redundant moves
2653 } if operandsNotSame6(%1 %2 %3 %4 %5 %6), notVolatile(%1 %2 %3 %4 %5 %6)
2655 // applies to f.e. ser_ir.asm
2659 ; Peephole 239 used a instead of acc
2667 ; Peephole 240 use clr instead of addc a,#0
2672 // peepholes 241.a to 241.d and 241.e to 241.h need to be in order
2684 ; Peephole 241.a optimized compare
2693 } if labelRefCountChange(%1 -1)
2695 // applies to generic pointer compare
2706 ; Peephole 241.b optimized compare
2714 } if labelRefCountChange(%1 -1)
2716 // applies to f.e. time.c
2726 ; Peephole 241.c optimized compare
2733 } if labelRefCountChange(%1 -1)
2735 // applies to f.e. malloc.c
2744 ; Peephole 241.d optimized compare
2750 } if labelRefCountChange(%1 -1)
2752 // applies to f.e. j = (k!=0x1000);
2753 // with volatile idata long k;
2768 ; Peephole 241.e optimized compare
2780 } if labelRefCountChange(%2 -1)
2782 // applies to f.e. j = (p!=NULL);
2783 // with volatile idata char *p;
2796 ; Peephole 241.f optimized compare
2806 } if labelRefCountChange(%2 -1)
2808 // applies to f.e. j = (k!=0x1000);
2809 // with volatile idata int k;
2820 ; Peephole 241.g optimized compare
2828 } if labelRefCountChange(%2 -1)
2830 // applies to f.e. vprintf.asm (--stack-auto)
2839 ; Peephole 241.h optimized compare
2845 } if labelRefCountChange(%2 -1)
2847 // applies to f.e. scott-bool1.c
2856 ; Peephole 242.a avoided branch jnz to jz
2859 } if labelRefCount %1 1
2861 // applies to f.e. scott-bool1.c
2872 ; Peephole 242.b avoided branch jnz to jz
2875 } if labelRefCount %1 1
2877 // applies to f.e. logic.c
2892 ; Peephole 242.c avoided branch jnz to jz
2895 } if labelRefCount %1 1
2897 // applies to f.e. vprintf.c
2898 // this is a rare case, usually the "tail increment" is noticed earlier
2905 ; Peephole 243 avoided branch to sjmp
2910 } if labelInRange(), labelRefCountChange(%3 -1), labelRefCountChange(%5 1)
2912 // applies to f.e. simplefloat.c (saving 1 cycle)
2917 ; Peephole 244.a moving first to a instead of r%1
2922 // applies to f.e. _itoa.c (saving 1 cycle)
2927 ; Peephole 244.b moving first to a instead of r%1
2933 // applies to f.e. bug-460010.c (saving 1 cycle)
2939 ; Peephole 244.c loading dpl from a instead of r%1
2948 ; Peephole 244.d loading dph from a instead of r%1
2952 // this one is safe but disables 245.a 245.b
2953 // please remove 245 if 245.a 245.b are found to be safe
2954 // applies to f.e. scott-compare.c
2965 ; Peephole 245 optimized complement (r%1 and acc set needed?)
2970 } if labelRefCount(%2 1), labelRefCountChange(%2 -1)
2972 // this one will not be triggered if 245 is present
2973 // please remove 245 if 245.a 245.b are found to be safe
2974 // applies to f.e. vprintf.c
2986 ; Peephole 245.a optimized conditional jump (r%1 and acc not set!)
2988 } if labelRefCount(%2 1), labelRefCountChange(%2 -1)
2990 // this one will not be triggered if 245 is present
2991 // please remove 245 if 245.a 245.b are found to be safe
2992 // applies to f.e. scott-compare.c
3004 ; Peephole 245.b optimized conditional jump (r%1 and acc not set!)
3006 } if labelRefCount(%2 1), labelRefCountChange(%2 -1)
3009 // rules 246.x apply to f.e. bitfields.c
3022 ; Peephole 246.a combined clr/clr
3039 ; Peephole 246.b combined set/set
3057 ; Peephole 246.c combined set/clr
3075 ; Peephole 246.d combined clr/set
3094 ; Peephole 246.e combined set/clr/clr
3114 ; Peephole 246.f combined set/clr/set
3134 ; Peephole 246.g combined clr/set/clr
3153 ; Peephole 246.h combined clr/set/set
3159 // rules 247.x apply to f.e. bitfields.c
3172 ; Peephole 247.a combined clr/clr
3189 ; Peephole 247.b combined set/set
3207 ; Peephole 247.c combined set/clr
3225 ; Peephole 247.d combined clr/set
3244 ; Peephole 247.e combined set/clr/clr
3264 ; Peephole 247.f combined set/clr/set
3284 ; Peephole 247.g combined clr/set/clr
3303 ; Peephole 247.h combined clr/set/set
3309 // Peepholes 248.x have to be compatible with the keyword volatile.
3310 // They optimize typical accesses to memory mapped I/O devices:
3311 // volatile xdata char t; t|=0x01;
3324 ; Peephole 248.a optimized or to xdata
3329 // volatile xdata char t; t&=0x01;
3342 ; Peephole 248.b optimized and to xdata
3347 // volatile xdata char t; t^=0x01;
3360 ; Peephole 248.c optimized xor to xdata
3365 // volatile xdata char t; t|=0x01; t&=~0x01; t|=0x01;
3387 ; Peephole 248.d optimized or/and/or to volatile xdata
3399 // volatile xdata char t; t&=~0x01; t|=0x01; t&=~0x01;
3421 ; Peephole 248.e optimized and/or/and to volatile xdata
3433 // volatile xdata char t; t|=0x01; t&=~0x01;
3449 ; Peephole 248.f optimized or/and to volatile xdata
3458 // volatile xdata char t; t&=~0x01; t|=0x01;
3474 ; Peephole 248.g optimized and/or to volatile xdata
3483 // volatile xdata char t; t^=0x01; t^=0x01;
3499 ; Peephole 248.h optimized xor/xor to volatile xdata
3508 // Peeepholes 248.i to 248.m are like 248.d to 248.h except they apply to bitfields:
3509 // xdata struct { unsigned b0:1; unsigned b1:1; unsigned b2:1; } xport;
3510 // xport.b0=1; xport.b0=0; xport.b0=1;
3531 ; Peephole 248.i optimized or/and/or to xdata bitfield
3560 ; Peephole 248.j optimized and/or/and to xdata bitfield
3584 ; Peephole 248.k optimized or/and to xdata bitfield
3605 ; Peephole 248.l optimized and/or to xdata bitfield
3626 ; Peephole 248.m optimized xor/xor to xdata bitfield
3637 ; Peephole 249.a jump optimization
3638 } if labelRefCount(%1 1), labelRefCountChange(%1 -1)
3644 ; Peephole 249.b jump optimization
3645 } if labelRefCount(%1 1), labelRefCountChange(%1 -1)
3648 // This allows non-interrupt and interrupt code to safely compete
3649 // for a resource without the non-interrupt code having to disable
3651 // volatile bit resource_is_free;
3652 // if( resource_is_free ) {
3653 // resource_is_free=0; do_something; resource_is_free=1;
3660 ; Peephole 250.a using atomic test and clear
3664 } if labelRefCount(%3 0), labelRefCountChange(%3 1)
3672 ; Peephole 250.b using atomic test and clear
3676 } if labelRefCount %2 1
3679 // not before peephole 250.b
3683 ; Peephole 251.a replaced ljmp to ret with ret
3685 } if labelIsReturnOnly(), labelRefCountChange(%5 -1)
3687 // not before peephole 250.b
3691 ; Peephole 251.b replaced sjmp to ret with ret
3693 } if labelIsReturnOnly(), labelRefCountChange(%5 -1)
3695 // applies to shifts.c and when accessing arrays with an unsigned integer index
3696 // saving 1 byte, 2 cycles
3706 ; Peephole 252 optimized left shift
3715 // applies to f.e. funptrs.c
3716 // saves one byte if %1 is a register or @register
3722 ; Peephole 254 optimized left shift
3726 // applies to f.e. switch.c
3739 ; Peephole 255 optimized jump table index calculation
3741 cjne a,#(%1+0x01),.+1
3750 // applies to f.e. jump tables and scott-bool1.c.
3751 // similar peepholes can be constructed for other instructions
3752 // after which a flag or a register is known (like: djnz, cjne, jnc)
3760 ; Peephole 256.a removed redundant clr c
3761 } if labelRefCount %2 0
3763 // applies to f.e. logf.c
3771 ; Peephole 256.b removed redundant clr a
3772 } if labelRefCount %2 0
3774 // applies to f.e. bug-905492.c
3782 ; Peephole 256.c loading %3 with zero from a
3784 } if labelRefCount %2 0
3786 // applies to f.e. malloc.c
3796 ; Peephole 256.d loading %3 with zero from a
3798 } if labelRefCount(%2 0),operandsNotRelated('a' %4)
3811 ; Peephole 256.e loading %3 with zero from a
3813 } if labelRefCount(%2 0),operandsNotRelated('a' %4 %6)
3828 ; Peephole 256.f loading %2 with zero from a
3830 } if labelRefCount(%2 0),operandsNotRelated('a' %4 %6 %8)
3833 // unsigned char i=8; do{ } while(--i != 0);
3834 // this applies if i is kept in a register
3839 ; Peephole 257.a optimized decrement with compare
3841 } if notVolatile(%1)
3843 // unsigned char i=8; do{ } while(--i != 0);
3844 // this applies if i is kept in data memory
3850 ; Peephole 257.b optimized decrement with compare
3852 } if notVolatile(%1), operandsNotRelated(%1 '@r0' '@r1')
3855 // in_byte<<=1; if(in_bit) in_byte|=1;
3856 // helps f.e. reading data on a 3-wire (SPI) bus
3867 ; Peephole 258.a optimized bitbanging
3873 } if notVolatile(%1), labelRefCountChange(%3 -1)
3875 // in_byte<<=1; if(in_bit) in_byte|=1;
3886 ; Peephole 258.b optimized bitbanging
3892 } if labelRefCountChange(%3 -1)
3894 // in_byte>>=1; if(in_bit) in_byte|=0x80;
3906 ; Peephole 258.c optimized bitbanging
3912 } if notVolatile(%1), labelRefCountChange(%3 -1)
3914 // in_byte>>=1; if(in_bit) in_byte|=0x80;
3926 ; Peephole 258.d optimized bitbanging
3932 } if labelRefCountChange(%3 -1)
3934 // out_bit=out_byte&0x80; out_byte<<=1;
3935 // helps f.e. writing data on a 3-wire (SPI) bus
3945 ; Peephole 258.e optimized bitbanging
3951 // out_bit=out_byte&0x01; out_byte>>=1;
3962 ; Peephole 258.f optimized bitbanging
3969 // Peepholes 259.x rely on the correct labelRefCount. Otherwise they are
3970 // not compatible with peepholes 250.x
3971 // Peepholes 250.x add jumps to a previously unused label. If the
3972 // labelRefCount is not increased, peepholes 259.x are (mistakenly) applied.
3973 // (Mail on sdcc-devel 2004-10-25)
3975 // applies to f.e. vprintf.c
3982 ; Peephole 259.a removed redundant label %2 and ret
3984 } if labelRefCount %2 0
3986 // applies to f.e. gets.c
3993 ; Peephole 259.b removed redundant label %2 and ret
3995 } if labelRefCount %2 0
3997 // optimizing jumptables
3998 // Please note: to enable peephole 260.x you currently have to set
3999 // the environment variable SDCC_SJMP_JUMPTABLE
4011 ; Peephole 260.a used sjmp in jumptable
4022 // optimizing jumptables
4035 ; Peephole 260.b used sjmp in jumptable
4047 // optimizing jumptables
4061 ; Peephole 260.c used sjmp in jumptable
4074 // optimizing jumptables
4089 ; Peephole 260.d used sjmp in jumptable
4103 // optimizing jumptables
4119 ; Peephole 260.e used sjmp in jumptable
4134 // optimizing jumptables
4152 ; Peephole 260.f used sjmp in jumptable
4169 // optimizing jumptables
4188 ; Peephole 260.g used sjmp in jumptable
4206 // optimizing jumptables
4226 ; Peephole 260.h used sjmp in jumptable
4245 // optimizing jumptables
4266 ; Peephole 260.i used sjmp in jumptable
4286 // optimizing jumptables
4308 ; Peephole 260.j used sjmp in jumptable
4329 // optimizing jumptables
4352 ; Peephole 260.k used sjmp in jumptable
4374 // optimizing jumptables
4398 ; Peephole 260.l used sjmp in jumptable
4421 // optimizing jumptables
4446 ; Peephole 260.m used sjmp in jumptable
4470 // applies to: a = (a << 1) | (a >> 15);
4484 ; Peephole 261.a optimized left rol
4492 // applies to: a = (a << 15) | (a >> 1);
4506 ; Peephole 261.b optimized right rol
4518 ; Peephole 262 removed redundant cpl c
4527 ; Peephole 263.a optimized loading const
4536 ; Peephole 263.b optimized loading const
4544 ; Peephole 263.c optimized loading const
4556 ; Peephole 264 jump optimization (acc not set)
4559 } if labelRefCount(%3 1), labelRefCountChange(%3 -1)
4565 ; Peephole 300 pop ar%1 removed
4571 ; Peephole 301 mov r%1,%2 removed
4572 } if notVolatile(%2), deadMove(%1)
4575 // applies to: void test( char c ) { if( c ) func1(); else func2(); }
4580 ; Peephole 400.a replaced lcall/ret with ljmp
4584 // applies to: void test( char c ) { if( c ) func1(); else func2(); }
4590 ; Peephole 400.b replaced lcall/ret with ljmp
4593 } if labelRefCount %2 0
4595 // applies to f.e. scott-bool1.c
4601 ; Peephole 400.c replaced lcall with ljmp
4608 // should be one of the last peepholes
4612 ; Peephole 500 removed redundant label %1
4613 } if labelRefCount(%1 0)