wok annotate linld/stuff/src/pipehole.awk @ rev 20634

linld: fix open()
author Pascal Bellard <pascal.bellard@slitaz.org>
date Tue Jan 08 17:51:51 2019 +0100 (2019-01-08)
parents ab907169f156
children cbcb33ee9044
rev   line source
pascal@20458 1 BEGIN { hold=0 }
pascal@20458 2 function isnum(n) { return match(n,/^[0-9+-]/) }
pascal@20458 3 {
pascal@20632 4 sub(/segment word public/,"segment byte public")
pascal@20634 5
pascal@20458 6 if (hold == 0) {
pascal@20458 7 s=$0
pascal@20534 8 if (/^ mov .[ix],bx$/ || /^ mov .[ix],.i$/) {
pascal@20543 9 r=$2; kept=0
pascal@20458 10 hold=1; split($2,regs,","); next
pascal@20458 11 }
pascal@20458 12 if (/^ inc e?.[ix]/ || /^ dec e?.[ix]/) {
pascal@20458 13 hold=2; r=$2; next
pascal@20458 14 }
pascal@20458 15 if (/^ mov [abcds][ix],/ && ! /,.s/) {
pascal@20458 16 hold=3; split($2,regs,","); next
pascal@20458 17 }
pascal@20458 18 if (/^ movzx eax,ax$/) { hold=4; next }
pascal@20544 19 if (/^ cmp word ptr/ || /^ cmp [bcd]x,/) {
pascal@20543 20 split($0,regs,",")
pascal@20543 21 if (isnum(regs[2]) && regs[2] != 0 &&
pascal@20543 22 (regs[2] % 256) == 0) {
pascal@20549 23 hold=5; next
pascal@20543 24 }
pascal@20543 25 }
pascal@20630 26 if (/^ mov ax,cs$/) { hold=6; kept=0; next }
pascal@20630 27 if (/^ mov cl,4$/) { hold=7; next }
pascal@20630 28 if (/^ cmp word ptr DGROUP:.*,0$/) {
pascal@20630 29 hold=8; split($2,regs,","); next
pascal@20630 30 }
pascal@20634 31 if (/^ cbw/) { hold=11; kept=0; next }
pascal@20634 32 if (/^ add [abcds][ix],2$/) {
pascal@20634 33 split($2,regs,","); hold=12; next
pascal@20634 34 }
pascal@20634 35 if (/^ sub [abcds][ix],2$/) {
pascal@20634 36 split($2,regs,","); hold=13; next
pascal@20634 37 }
pascal@20458 38 }
pascal@20458 39 else if (hold == 1) {
pascal@20543 40 if (/^ ;/) { line[kept++]=$0; next }
pascal@20458 41 hold=0; split($2,args,","); op=""
pascal@20458 42 if ($1 == "add") op="+"
pascal@20458 43 if ($1 == "sub") op="-"
pascal@20543 44 if (op != "" && regs[1] == args[1]) {
pascal@20543 45 if (isnum(args[2])) {
pascal@20630 46 for (i = kept++; i > 0; i--) line[i] = line[i-1]
pascal@20630 47 line[0] = "\tlea\t" regs[1] ",[" regs[2] op args[2] "]"
pascal@20630 48 hold=10; next
pascal@20543 49 }
pascal@20543 50 line[kept++]=$0
pascal@20543 51 hold=1
pascal@20458 52 next
pascal@20458 53 }
pascal@20520 54 if (/^ pop [ds]i/ && regs[2] ~ /^[ds]i$/) {
pascal@20520 55 print " xchg " r
pascal@20520 56 }
pascal@20543 57 else print s
pascal@20543 58 for (i = 0; i < kept; i++) print line[i]; kept=0
pascal@20458 59 }
pascal@20458 60 else if (hold == 2) {
pascal@20458 61 hold=0; split($2,args,","); print s
pascal@20458 62 if ($1 == "or" && r == args[1] && r == args[2]) next # don't clear C ...
pascal@20458 63 }
pascal@20458 64 else if (hold == 3) {
pascal@20458 65 hold=0
pascal@20542 66 if (/^ add [abcds][ix],/) {
pascal@20458 67 split($2,regs2,",")
pascal@20458 68 if (regs[1] == regs2[1] && (regs2[2] == "offset" || isnum(regs2[2]))) {
pascal@20549 69 t=$0; sub(/mov/,$1,s); sub(/add/,"mov",t)
pascal@20458 70 print t; print s; next
pascal@20458 71 }
pascal@20458 72 }
pascal@20458 73 print s
pascal@20458 74 }
pascal@20458 75 else if (hold == 4) {
pascal@20458 76 hold=0
pascal@20458 77 if (/^ push eax$/) {
pascal@20458 78 print " push 0"; print " push ax"; next
pascal@20458 79 } else { print s }
pascal@20458 80 }
pascal@20543 81 else if (hold == 5) {
pascal@20543 82 hold=0
pascal@20543 83 if ($1 == "jae" || $1 == "jb") {
pascal@20544 84 sub(/word ptr/,"byte ptr",s); sub(/x,/,"h,",s) ||
pascal@20543 85 sub(/\],/,"+1],",s) || sub(/,/,"+1,",s)
pascal@20543 86 s = s "/256"
pascal@20543 87 }
pascal@20543 88 print s
pascal@20543 89 }
pascal@20630 90 else if (hold == 6) {
pascal@20630 91 if (($1 == "and" || $1 == "add") && $2 ~ /^ax,/) {
pascal@20630 92 line[kept++]=$0
pascal@20630 93 next
pascal@20630 94 }
pascal@20630 95 p=$0
pascal@20630 96 if (/^ movzx eax,ax$/) {
pascal@20630 97 s=" mov eax,cs"; p=""
pascal@20630 98 }
pascal@20630 99 print s
pascal@20630 100 for (i = 0; i < kept; i++) print line[i]; kept=0
pascal@20630 101 if (p != "") print p
pascal@20630 102 hold=0; next
pascal@20630 103 }
pascal@20630 104 else if (hold == 7) {
pascal@20458 105 hold=0
pascal@20520 106 if (/^ call near ptr N_LXURSH@$/) {
pascal@20520 107 print " extrn N_LXURSH@4:near"
pascal@20520 108 print " call near ptr N_LXURSH@4"
pascal@20520 109 next
pascal@20520 110 }
pascal@20528 111 if (/^ call near ptr N_LXLSH@$/) {
pascal@20528 112 print " extrn N_LXLSH@4:near"
pascal@20528 113 print " call near ptr N_LXLSH@4"
pascal@20528 114 next
pascal@20528 115 }
pascal@20520 116 print s
pascal@20458 117 }
pascal@20630 118 else if (hold == 8) {
pascal@20630 119 if ($1 == "je" || $1 == "jne") { p=$0; hold=9; next }
pascal@20630 120 hold=0
pascal@20630 121 print s
pascal@20630 122 }
pascal@20630 123 else if (hold == 9) {
pascal@20630 124 hold=0; split($2,args,",")
pascal@20630 125 if (/^ mov ax,/ && args[2] == regs[1]) {
pascal@20630 126 print; print " or ax,ax"; print p; next
pascal@20630 127 }
pascal@20630 128 print s; print p;
pascal@20630 129 }
pascal@20630 130 else if (hold == 10) {
pascal@20630 131 hold=0
pascal@20630 132 if (/^ mov [sd]i,ax$/) {
pascal@20630 133 split($2,args,",")
pascal@20630 134 for (i = 0; i < kept; i++) {
pascal@20630 135 sub(/ax/,args[1],line[i]); print line[i]
pascal@20630 136 }
pascal@20630 137 next
pascal@20630 138 }
pascal@20630 139 for (i = 0; i < kept; i++) print line[i]
pascal@20630 140 }
pascal@20634 141 else if (hold == 11) {
pascal@20634 142 if (/^ inc ax$/ || /^ dec ax$/) {
pascal@20634 143 line[kept++]=$0; next
pascal@20634 144 }
pascal@20634 145 split($2,args,",")
pascal@20634 146 if (/^ mov cl,/) {
pascal@20634 147 split($2,args,",")
pascal@20634 148 if (args[2] >= 8) {
pascal@20634 149 line[kept++]=$0; next
pascal@20634 150 }
pascal@20634 151 }
pascal@20634 152 if (!/^ shl ax,/ || (args[2] != "cl" && args[2] < 8)) {
pascal@20634 153 print " cbw "
pascal@20634 154 }
pascal@20634 155 for (i = 0; i < kept; i++) print line[i]
pascal@20634 156 hold=kept=0
pascal@20634 157 }
pascal@20634 158 else if (hold == 12) {
pascal@20634 159 hold=0
pascal@20634 160 if ($1 != "adc" && $1 != "sbb" && ! /^ jn?[abc]/) {
pascal@20634 161 print " inc " regs[1]
pascal@20634 162 print " inc " regs[1]
pascal@20634 163 }
pascal@20634 164 else print " add " regs[1] ",2"
pascal@20634 165 }
pascal@20634 166 else if (hold == 13) {
pascal@20634 167 hold=0
pascal@20634 168 if ($1 != "adc" && $1 != "sbb" && ! /^ jn?[abc]/) {
pascal@20634 169 print " dec " regs[1]
pascal@20634 170 print " dec " regs[1]
pascal@20634 171 }
pascal@20634 172 else print " sub " regs[1] ",2"
pascal@20634 173 }
pascal@20458 174 s=$0
pascal@20458 175 # These optimisation may break ZF or CF
pascal@20485 176 if (/^ sub sp,2$/) { print " push ax"; next }
pascal@20485 177 if (/^ sub sp,4$/) { print " push ax"; print " push ax"; next }
pascal@20485 178 if (/^ add sp,4$/) { print " pop cx"; print " pop cx"; next }
pascal@20458 179 if (/^ mov d*word ptr .*,0$/ || /^ mov dword ptr .*,large 0$/) {
pascal@20458 180 sub(/mov/,"and",s); print s; next # slower
pascal@20458 181 }
pascal@20458 182 if (/^ mov d*word ptr .*,-1$/ || /^ mov dword ptr .*,large -1$/) {
pascal@20458 183 sub(/mov/,"or",s); print s; next # slower
pascal@20458 184 }
pascal@20458 185 if (/^ or .*,0$/ || /^ and .*,-1$/) next
pascal@20458 186 if (/^ or [abcd]x,/) {
pascal@20458 187 split($2,args,",")
pascal@20458 188 if (isnum(args[2]) && args[2] >= 0 && args[2] < 256) {
pascal@20458 189 print " or " substr(args[1],1,1) "l," args[2]; next
pascal@20458 190 }
pascal@20458 191 }
pascal@20458 192 if (/^ and [abcd]x,/) {
pascal@20458 193 split($2,args,",")
pascal@20459 194 if (isnum(args[2]) && args[2] >= -256 && args[2] < 0) {
pascal@20458 195 print " and " substr(args[1],1,1) "l," args[2]; next
pascal@20458 196 }
pascal@20458 197 }
pascal@20458 198 if (/^ or e[abcd]x,/) {
pascal@20458 199 split($2,args,",")
pascal@20458 200 if (args[2] == "large") { args[2] = $3 }
pascal@20458 201 if (isnum(args[2]) && args[2] >= 0 && args[2] < 256) {
pascal@20458 202 print " or " substr(args[1],2,1) "l," args[2]; next
pascal@20458 203 }
pascal@20458 204 }
pascal@20458 205 if (/^ and e[abcd]x,/) {
pascal@20458 206 split($2,args,",")
pascal@20458 207 if (args[2] == "large") { args[2] = $3 }
pascal@20459 208 if (isnum(args[2]) && args[2] >= -256 && args[2] < 0) {
pascal@20458 209 print " and " substr(args[1],2,1) "l," args[2]; next
pascal@20458 210 }
pascal@20458 211 }
pascal@20458 212 if (/^ or e[abcds][ix],/) {
pascal@20458 213 split($2,args,",")
pascal@20458 214 if (args[2] == "large") { args[2] = $3 }
pascal@20458 215 if (isnum(args[2]) && args[2] >= 0 && args[2] < 65536) {
pascal@20458 216 print " or " substr(args[1],2) "," args[2]; next
pascal@20458 217 }
pascal@20458 218 }
pascal@20458 219 if (/^ and e[abcds][ix],/) {
pascal@20458 220 split($2,args,",")
pascal@20458 221 if (args[2] == "large") { args[2] = $3 }
pascal@20459 222 if (isnum(args[2]) && args[2] >= -65536 && args[2] < 0) {
pascal@20458 223 print " and " substr(args[1],2) "," args[2]; next
pascal@20458 224 }
pascal@20458 225 }
pascal@20543 226 if (/^ add word ptr/ || /^ sub word ptr/ ||
pascal@20544 227 /^ add [bcd]x,/ || /^ sub [bcd]x,/) {
pascal@20542 228 split($0,args,",")
pascal@20542 229 if (isnum(args[2]) && (args[2] % 256 == 0)) {
pascal@20544 230 sub(/word ptr/,"byte ptr",s); sub(/x,/,"h,",s) ||
pascal@20543 231 sub(/\],/,"+1],",s) || sub(/,/,"+1,",s)
pascal@20542 232 print s "/256"; next
pascal@20542 233 }
pascal@20542 234 }
pascal@20546 235 if (/^ add dword ptr/ || /^ sub dword ptr/) {
pascal@20458 236 split($0,args,",")
pascal@20543 237 if (args[2] == "large") { args[2] = $3 }
pascal@20458 238 if (isnum(args[2])) {
pascal@20546 239 if (args[2] % 16777216 == 0) {
pascal@20546 240 sub(/dword/,"byte",s)
pascal@20543 241 sub(/\],/,"+3],",s) || sub(/,/,"+3,",s)
pascal@20458 242 print s "/16777216"; next
pascal@20458 243 }
pascal@20458 244 if (args[2] % 65536 == 0) {
pascal@20546 245 sub(/dword/,"word",s)
pascal@20543 246 sub(/\],/,"+2],",s) || sub(/,/,"+2,",s)
pascal@20458 247 print s "/65536"; next
pascal@20458 248 }
pascal@20458 249 }
pascal@20458 250 }
pascal@20458 251 if (/^ mov e.x,/) {
pascal@20458 252 split($2,args,",")
pascal@20458 253 r=args[1]
pascal@20458 254 if (args[2] == "large") { args[2] = $3 }
pascal@20458 255 if (isnum(args[2]) && args[2] % 65536 == args[2]) {
pascal@20458 256 if (args[2] % 256 == args[2] || args[2] % 256 == 0) {
pascal@20458 257 print " xor " r "," r
pascal@20458 258 if (args[2] == 0) next
pascal@20458 259 x=" mov " substr(r,2,1)
pascal@20458 260 if (args[2] % 256 == 0) {
pascal@20458 261 print x "h," args[2] "/256"
pascal@20458 262 }
pascal@20458 263 else { print x "l," args[2] }
pascal@20458 264 next
pascal@20458 265 }
pascal@20458 266 }
pascal@20458 267 }
pascal@20458 268 print
pascal@20458 269 }