wok annotate linld/stuff/src/pipehole.awk @ rev 20549

Remove linux-mmc (again)
author Pascal Bellard <pascal.bellard@slitaz.org>
date Sun Dec 02 11:03:17 2018 +0100 (2018-12-02)
parents 828bdd9ad908
children d3d2a15d3d0d
rev   line source
pascal@20458 1 BEGIN { hold=0 }
pascal@20458 2 function isnum(n) { return match(n,/^[0-9+-]/) }
pascal@20458 3 {
pascal@20458 4 if (hold == 0) {
pascal@20458 5 s=$0
pascal@20534 6 if (/^ mov .[ix],bx$/ || /^ mov .[ix],.i$/) {
pascal@20543 7 r=$2; kept=0
pascal@20458 8 hold=1; split($2,regs,","); next
pascal@20458 9 }
pascal@20458 10 if (/^ inc e?.[ix]/ || /^ dec e?.[ix]/) {
pascal@20458 11 hold=2; r=$2; next
pascal@20458 12 }
pascal@20458 13 if (/^ mov [abcds][ix],/ && ! /,.s/) {
pascal@20458 14 hold=3; split($2,regs,","); next
pascal@20458 15 }
pascal@20458 16 if (/^ movzx eax,ax$/) { hold=4; next }
pascal@20544 17 if (/^ cmp word ptr/ || /^ cmp [bcd]x,/) {
pascal@20543 18 split($0,regs,",")
pascal@20543 19 if (isnum(regs[2]) && regs[2] != 0 &&
pascal@20543 20 (regs[2] % 256) == 0) {
pascal@20549 21 hold=5; next
pascal@20543 22 }
pascal@20543 23 }
pascal@20520 24 if (/^ mov cl,4$/) { hold=8; next }
pascal@20458 25 }
pascal@20458 26 else if (hold == 1) {
pascal@20543 27 if (/^ ;/) { line[kept++]=$0; next }
pascal@20458 28 hold=0; split($2,args,","); op=""
pascal@20458 29 if ($1 == "add") op="+"
pascal@20458 30 if ($1 == "sub") op="-"
pascal@20543 31 if (op != "" && regs[1] == args[1]) {
pascal@20543 32 if (isnum(args[2])) {
pascal@20543 33 print "\tlea\t" regs[1] ",[" regs[2] op args[2] "]"
pascal@20543 34 for (i = 0; i < kept; i++) print line[i]; kept=0
pascal@20543 35 next
pascal@20543 36 }
pascal@20543 37 line[kept++]=$0
pascal@20543 38 hold=1
pascal@20458 39 next
pascal@20458 40 }
pascal@20520 41 if (/^ pop [ds]i/ && regs[2] ~ /^[ds]i$/) {
pascal@20520 42 print " xchg " r
pascal@20520 43 }
pascal@20543 44 else print s
pascal@20543 45 for (i = 0; i < kept; i++) print line[i]; kept=0
pascal@20458 46 }
pascal@20458 47 else if (hold == 2) {
pascal@20458 48 hold=0; split($2,args,","); print s
pascal@20458 49 if ($1 == "or" && r == args[1] && r == args[2]) next # don't clear C ...
pascal@20458 50 }
pascal@20458 51 else if (hold == 3) {
pascal@20458 52 hold=0
pascal@20542 53 if (/^ add [abcds][ix],/) {
pascal@20458 54 split($2,regs2,",")
pascal@20458 55 if (regs[1] == regs2[1] && (regs2[2] == "offset" || isnum(regs2[2]))) {
pascal@20549 56 t=$0; sub(/mov/,$1,s); sub(/add/,"mov",t)
pascal@20458 57 print t; print s; next
pascal@20458 58 }
pascal@20458 59 }
pascal@20458 60 print s
pascal@20458 61 }
pascal@20458 62 else if (hold == 4) {
pascal@20458 63 hold=0
pascal@20458 64 if (/^ push eax$/) {
pascal@20458 65 print " push 0"; print " push ax"; next
pascal@20458 66 } else { print s }
pascal@20458 67 }
pascal@20543 68 else if (hold == 5) {
pascal@20543 69 hold=0
pascal@20543 70 if ($1 == "jae" || $1 == "jb") {
pascal@20544 71 sub(/word ptr/,"byte ptr",s); sub(/x,/,"h,",s) ||
pascal@20543 72 sub(/\],/,"+1],",s) || sub(/,/,"+1,",s)
pascal@20543 73 s = s "/256"
pascal@20543 74 }
pascal@20543 75 print s
pascal@20543 76 }
pascal@20520 77 else if (hold == 8) {
pascal@20458 78 hold=0
pascal@20520 79 if (/^ call near ptr N_LXURSH@$/) {
pascal@20520 80 print " extrn N_LXURSH@4:near"
pascal@20520 81 print " call near ptr N_LXURSH@4"
pascal@20520 82 next
pascal@20520 83 }
pascal@20528 84 if (/^ call near ptr N_LXLSH@$/) {
pascal@20528 85 print " extrn N_LXLSH@4:near"
pascal@20528 86 print " call near ptr N_LXLSH@4"
pascal@20528 87 next
pascal@20528 88 }
pascal@20520 89 print s
pascal@20458 90 }
pascal@20458 91 s=$0
pascal@20458 92 # These optimisation may break ZF or CF
pascal@20485 93 if (/^ sub sp,2$/) { print " push ax"; next }
pascal@20485 94 if (/^ sub sp,4$/) { print " push ax"; print " push ax"; next }
pascal@20485 95 if (/^ add sp,4$/) { print " pop cx"; print " pop cx"; next }
pascal@20458 96 if (/^ mov d*word ptr .*,0$/ || /^ mov dword ptr .*,large 0$/) {
pascal@20458 97 sub(/mov/,"and",s); print s; next # slower
pascal@20458 98 }
pascal@20458 99 if (/^ mov d*word ptr .*,-1$/ || /^ mov dword ptr .*,large -1$/) {
pascal@20458 100 sub(/mov/,"or",s); print s; next # slower
pascal@20458 101 }
pascal@20458 102 if (/^ or .*,0$/ || /^ and .*,-1$/) next
pascal@20458 103 if (/^ or [abcd]x,/) {
pascal@20458 104 split($2,args,",")
pascal@20458 105 if (isnum(args[2]) && args[2] >= 0 && args[2] < 256) {
pascal@20458 106 print " or " substr(args[1],1,1) "l," args[2]; next
pascal@20458 107 }
pascal@20458 108 }
pascal@20458 109 if (/^ and [abcd]x,/) {
pascal@20458 110 split($2,args,",")
pascal@20459 111 if (isnum(args[2]) && args[2] >= -256 && args[2] < 0) {
pascal@20458 112 print " and " substr(args[1],1,1) "l," args[2]; next
pascal@20458 113 }
pascal@20458 114 }
pascal@20458 115 if (/^ or e[abcd]x,/) {
pascal@20458 116 split($2,args,",")
pascal@20458 117 if (args[2] == "large") { args[2] = $3 }
pascal@20458 118 if (isnum(args[2]) && args[2] >= 0 && args[2] < 256) {
pascal@20458 119 print " or " substr(args[1],2,1) "l," args[2]; next
pascal@20458 120 }
pascal@20458 121 }
pascal@20458 122 if (/^ and e[abcd]x,/) {
pascal@20458 123 split($2,args,",")
pascal@20458 124 if (args[2] == "large") { args[2] = $3 }
pascal@20459 125 if (isnum(args[2]) && args[2] >= -256 && args[2] < 0) {
pascal@20458 126 print " and " substr(args[1],2,1) "l," args[2]; next
pascal@20458 127 }
pascal@20458 128 }
pascal@20458 129 if (/^ or e[abcds][ix],/) {
pascal@20458 130 split($2,args,",")
pascal@20458 131 if (args[2] == "large") { args[2] = $3 }
pascal@20458 132 if (isnum(args[2]) && args[2] >= 0 && args[2] < 65536) {
pascal@20458 133 print " or " substr(args[1],2) "," args[2]; next
pascal@20458 134 }
pascal@20458 135 }
pascal@20458 136 if (/^ and e[abcds][ix],/) {
pascal@20458 137 split($2,args,",")
pascal@20458 138 if (args[2] == "large") { args[2] = $3 }
pascal@20459 139 if (isnum(args[2]) && args[2] >= -65536 && args[2] < 0) {
pascal@20458 140 print " and " substr(args[1],2) "," args[2]; next
pascal@20458 141 }
pascal@20458 142 }
pascal@20543 143 if (/^ add word ptr/ || /^ sub word ptr/ ||
pascal@20544 144 /^ add [bcd]x,/ || /^ sub [bcd]x,/) {
pascal@20542 145 split($0,args,",")
pascal@20542 146 if (isnum(args[2]) && (args[2] % 256 == 0)) {
pascal@20544 147 sub(/word ptr/,"byte ptr",s); sub(/x,/,"h,",s) ||
pascal@20543 148 sub(/\],/,"+1],",s) || sub(/,/,"+1,",s)
pascal@20542 149 print s "/256"; next
pascal@20542 150 }
pascal@20542 151 }
pascal@20546 152 if (/^ add dword ptr/ || /^ sub dword ptr/) {
pascal@20458 153 split($0,args,",")
pascal@20543 154 if (args[2] == "large") { args[2] = $3 }
pascal@20458 155 if (isnum(args[2])) {
pascal@20546 156 if (args[2] % 16777216 == 0) {
pascal@20546 157 sub(/dword/,"byte",s)
pascal@20543 158 sub(/\],/,"+3],",s) || sub(/,/,"+3,",s)
pascal@20458 159 print s "/16777216"; next
pascal@20458 160 }
pascal@20458 161 if (args[2] % 65536 == 0) {
pascal@20546 162 sub(/dword/,"word",s)
pascal@20543 163 sub(/\],/,"+2],",s) || sub(/,/,"+2,",s)
pascal@20458 164 print s "/65536"; next
pascal@20458 165 }
pascal@20458 166 }
pascal@20458 167 }
pascal@20458 168 if (/^ mov e.x,/) {
pascal@20458 169 split($2,args,",")
pascal@20458 170 r=args[1]
pascal@20458 171 if (args[2] == "large") { args[2] = $3 }
pascal@20458 172 if (isnum(args[2]) && args[2] % 65536 == args[2]) {
pascal@20458 173 if (args[2] % 256 == args[2] || args[2] % 256 == 0) {
pascal@20458 174 print " xor " r "," r
pascal@20458 175 if (args[2] == 0) next
pascal@20458 176 x=" mov " substr(r,2,1)
pascal@20458 177 if (args[2] % 256 == 0) {
pascal@20458 178 print x "h," args[2] "/256"
pascal@20458 179 }
pascal@20458 180 else { print x "l," args[2] }
pascal@20458 181 next
pascal@20458 182 }
pascal@20458 183 }
pascal@20458 184 }
pascal@20458 185 print
pascal@20458 186 }