wok annotate linld/stuff/src/pipehole.awk @ rev 21569

Up zstd (1.4.0), fix linld: base_himem/strtol
author Pascal Bellard <pascal.bellard@slitaz.org>
date Sat May 18 13:29:32 2019 +0200 (2019-05-18)
parents cbcb33ee9044
children 66530154b12f
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($2,regs,","); hold=13; next
pascal@20634 37 }
pascal@21569 38 if (/^ push dx$/) {
pascal@21569 39 hold=14; next;
pascal@21569 40 }
pascal@20458 41 }
pascal@20458 42 else if (hold == 1) {
pascal@20543 43 if (/^ ;/) { line[kept++]=$0; next }
pascal@20458 44 hold=0; split($2,args,","); op=""
pascal@20458 45 if ($1 == "add") op="+"
pascal@20458 46 if ($1 == "sub") op="-"
pascal@20751 47 if ($1 == "inc") { op="+"; args[2]="1"; }
pascal@20751 48 if ($1 == "dec") { op="-"; args[2]="1"; }
pascal@20543 49 if (op != "" && regs[1] == args[1]) {
pascal@20543 50 if (isnum(args[2])) {
pascal@20630 51 for (i = kept++; i > 0; i--) line[i] = line[i-1]
pascal@20630 52 line[0] = "\tlea\t" regs[1] ",[" regs[2] op args[2] "]"
pascal@20630 53 hold=10; next
pascal@20543 54 }
pascal@20543 55 line[kept++]=$0
pascal@20543 56 hold=1
pascal@20458 57 next
pascal@20458 58 }
pascal@20520 59 if (/^ pop [ds]i/ && regs[2] ~ /^[ds]i$/) {
pascal@20520 60 print " xchg " r
pascal@20520 61 }
pascal@20543 62 else print s
pascal@20543 63 for (i = 0; i < kept; i++) print line[i]; kept=0
pascal@20458 64 }
pascal@20458 65 else if (hold == 2) {
pascal@20458 66 hold=0; split($2,args,","); print s
pascal@20458 67 if ($1 == "or" && r == args[1] && r == args[2]) next # don't clear C ...
pascal@20458 68 }
pascal@20458 69 else if (hold == 3) {
pascal@20458 70 hold=0
pascal@20542 71 if (/^ add [abcds][ix],/) {
pascal@20458 72 split($2,regs2,",")
pascal@20458 73 if (regs[1] == regs2[1] && (regs2[2] == "offset" || isnum(regs2[2]))) {
pascal@20549 74 t=$0; sub(/mov/,$1,s); sub(/add/,"mov",t)
pascal@20458 75 print t; print s; next
pascal@20458 76 }
pascal@20458 77 }
pascal@20458 78 print s
pascal@20458 79 }
pascal@20458 80 else if (hold == 4) {
pascal@20458 81 hold=0
pascal@20458 82 if (/^ push eax$/) {
pascal@20458 83 print " push 0"; print " push ax"; next
pascal@20458 84 } else { print s }
pascal@20458 85 }
pascal@20543 86 else if (hold == 5) {
pascal@20543 87 hold=0
pascal@20543 88 if ($1 == "jae" || $1 == "jb") {
pascal@20544 89 sub(/word ptr/,"byte ptr",s); sub(/x,/,"h,",s) ||
pascal@20543 90 sub(/\],/,"+1],",s) || sub(/,/,"+1,",s)
pascal@20543 91 s = s "/256"
pascal@20543 92 }
pascal@20543 93 print s
pascal@20543 94 }
pascal@20630 95 else if (hold == 6) {
pascal@20630 96 if (($1 == "and" || $1 == "add") && $2 ~ /^ax,/) {
pascal@20630 97 line[kept++]=$0
pascal@20630 98 next
pascal@20630 99 }
pascal@20630 100 p=$0
pascal@20630 101 if (/^ movzx eax,ax$/) {
pascal@20630 102 s=" mov eax,cs"; p=""
pascal@20630 103 }
pascal@20630 104 print s
pascal@20630 105 for (i = 0; i < kept; i++) print line[i]; kept=0
pascal@20630 106 if (p != "") print p
pascal@20630 107 hold=0; next
pascal@20630 108 }
pascal@20630 109 else if (hold == 7) {
pascal@20458 110 hold=0
pascal@20520 111 if (/^ call near ptr N_LXURSH@$/) {
pascal@20520 112 print " extrn N_LXURSH@4:near"
pascal@20520 113 print " call near ptr N_LXURSH@4"
pascal@20520 114 next
pascal@20520 115 }
pascal@20528 116 if (/^ call near ptr N_LXLSH@$/) {
pascal@20528 117 print " extrn N_LXLSH@4:near"
pascal@20528 118 print " call near ptr N_LXLSH@4"
pascal@20528 119 next
pascal@20528 120 }
pascal@20520 121 print s
pascal@20458 122 }
pascal@20630 123 else if (hold == 8) {
pascal@20630 124 if ($1 == "je" || $1 == "jne") { p=$0; hold=9; next }
pascal@20630 125 hold=0
pascal@20630 126 print s
pascal@20630 127 }
pascal@20630 128 else if (hold == 9) {
pascal@20630 129 hold=0; split($2,args,",")
pascal@20630 130 if (/^ mov ax,/ && args[2] == regs[1]) {
pascal@20630 131 print; print " or ax,ax"; print p; next
pascal@20630 132 }
pascal@20630 133 print s; print p;
pascal@20630 134 }
pascal@20630 135 else if (hold == 10) {
pascal@20751 136 split($2,args,","); op=""
pascal@20751 137 if ($1 == "add") op="+"
pascal@20751 138 if ($1 == "sub") op="-"
pascal@20751 139 if ($1 == "inc") { op="+"; args[2]="1"; }
pascal@20751 140 if ($1 == "dec") { op="-"; args[2]="1"; }
pascal@20751 141 if (op != "" && isnum(args[2])) {
pascal@20751 142 split(line[0],reg,",")
pascal@20751 143 if (substr(reg[1],length(reg[1])-1,2) == args[1]) {
pascal@20751 144 line[0] = substr(line[0],1,length(line[0])-1) op args[2] "]"
pascal@20751 145 next
pascal@20751 146 }
pascal@20751 147 }
pascal@20630 148 hold=0
pascal@20630 149 if (/^ mov [sd]i,ax$/) {
pascal@20630 150 split($2,args,",")
pascal@20630 151 for (i = 0; i < kept; i++) {
pascal@20630 152 sub(/ax/,args[1],line[i]); print line[i]
pascal@20630 153 }
pascal@20630 154 next
pascal@20630 155 }
pascal@20630 156 for (i = 0; i < kept; i++) print line[i]
pascal@20630 157 }
pascal@20634 158 else if (hold == 11) {
pascal@20634 159 if (/^ inc ax$/ || /^ dec ax$/) {
pascal@20634 160 line[kept++]=$0; next
pascal@20634 161 }
pascal@20634 162 split($2,args,",")
pascal@20634 163 if (/^ mov cl,/) {
pascal@20634 164 split($2,args,",")
pascal@20634 165 if (args[2] >= 8) {
pascal@20634 166 line[kept++]=$0; next
pascal@20634 167 }
pascal@20634 168 }
pascal@20634 169 if (!/^ shl ax,/ || (args[2] != "cl" && args[2] < 8)) {
pascal@20634 170 print " cbw "
pascal@20634 171 }
pascal@20634 172 for (i = 0; i < kept; i++) print line[i]
pascal@20634 173 hold=kept=0
pascal@20634 174 }
pascal@20634 175 else if (hold == 12) {
pascal@20634 176 hold=0
pascal@20634 177 if ($1 != "adc" && $1 != "sbb" && ! /^ jn?[abc]/) {
pascal@20634 178 print " inc " regs[1]
pascal@20634 179 print " inc " regs[1]
pascal@20634 180 }
pascal@20634 181 else print " add " regs[1] ",2"
pascal@20634 182 }
pascal@20634 183 else if (hold == 13) {
pascal@20634 184 hold=0
pascal@20634 185 if ($1 != "adc" && $1 != "sbb" && ! /^ jn?[abc]/) {
pascal@20634 186 print " dec " regs[1]
pascal@20634 187 print " dec " regs[1]
pascal@20634 188 }
pascal@20634 189 else print " sub " regs[1] ",2"
pascal@20634 190 }
pascal@21569 191 else if (hold == 14) {
pascal@21569 192 if (/^ push ax$/) { hold++; next; }
pascal@21569 193 print " push dx";
pascal@21569 194 hold=0;
pascal@21569 195 }
pascal@21569 196 else if (hold == 15) {
pascal@21569 197 if (/^ pop eax$/) { hold++; next; }
pascal@21569 198 print " push dx";
pascal@21569 199 print " push ax";
pascal@21569 200 hold=0;
pascal@21569 201 }
pascal@21569 202 else if (hold == 16) {
pascal@21569 203 hold=0;
pascal@21569 204 if (/^ shr eax,16$/) { print " xchg ax,dx"; next; }
pascal@21569 205 print " push dx";
pascal@21569 206 print " push ax";
pascal@21569 207 print " pop eax";
pascal@21569 208 }
pascal@21569 209 else if (hold == 17) {
pascal@21569 210 hold=0;
pascal@21569 211 if (/^ cmp ax,-1$/) { print " inc ax"; next; }
pascal@21569 212 }
pascal@21569 213 if (/^ call near ptr @fileexist\$/) { print; hold=17; next; }
pascal@20458 214 s=$0
pascal@20458 215 # These optimisation may break ZF or CF
pascal@20485 216 if (/^ sub sp,2$/) { print " push ax"; next }
pascal@20485 217 if (/^ sub sp,4$/) { print " push ax"; print " push ax"; next }
pascal@20485 218 if (/^ add sp,4$/) { print " pop cx"; print " pop cx"; next }
pascal@20458 219 if (/^ mov d*word ptr .*,0$/ || /^ mov dword ptr .*,large 0$/) {
pascal@20458 220 sub(/mov/,"and",s); print s; next # slower
pascal@20458 221 }
pascal@20458 222 if (/^ mov d*word ptr .*,-1$/ || /^ mov dword ptr .*,large -1$/) {
pascal@20458 223 sub(/mov/,"or",s); print s; next # slower
pascal@20458 224 }
pascal@20458 225 if (/^ or .*,0$/ || /^ and .*,-1$/) next
pascal@20458 226 if (/^ or [abcd]x,/) {
pascal@20458 227 split($2,args,",")
pascal@20458 228 if (isnum(args[2]) && args[2] >= 0 && args[2] < 256) {
pascal@20458 229 print " or " substr(args[1],1,1) "l," args[2]; next
pascal@20458 230 }
pascal@20458 231 }
pascal@20458 232 if (/^ and [abcd]x,/) {
pascal@20458 233 split($2,args,",")
pascal@20459 234 if (isnum(args[2]) && args[2] >= -256 && args[2] < 0) {
pascal@20458 235 print " and " substr(args[1],1,1) "l," args[2]; next
pascal@20458 236 }
pascal@20458 237 }
pascal@20458 238 if (/^ or e[abcd]x,/) {
pascal@20458 239 split($2,args,",")
pascal@20458 240 if (args[2] == "large") { args[2] = $3 }
pascal@20458 241 if (isnum(args[2]) && args[2] >= 0 && args[2] < 256) {
pascal@20458 242 print " or " substr(args[1],2,1) "l," args[2]; next
pascal@20458 243 }
pascal@20458 244 }
pascal@20458 245 if (/^ and e[abcd]x,/) {
pascal@20458 246 split($2,args,",")
pascal@20458 247 if (args[2] == "large") { args[2] = $3 }
pascal@20459 248 if (isnum(args[2]) && args[2] >= -256 && args[2] < 0) {
pascal@20458 249 print " and " substr(args[1],2,1) "l," args[2]; next
pascal@20458 250 }
pascal@20458 251 }
pascal@20458 252 if (/^ or e[abcds][ix],/) {
pascal@20458 253 split($2,args,",")
pascal@20458 254 if (args[2] == "large") { args[2] = $3 }
pascal@20458 255 if (isnum(args[2]) && args[2] >= 0 && args[2] < 65536) {
pascal@20458 256 print " or " substr(args[1],2) "," args[2]; next
pascal@20458 257 }
pascal@20458 258 }
pascal@20458 259 if (/^ and e[abcds][ix],/) {
pascal@20458 260 split($2,args,",")
pascal@20458 261 if (args[2] == "large") { args[2] = $3 }
pascal@20459 262 if (isnum(args[2]) && args[2] >= -65536 && args[2] < 0) {
pascal@20458 263 print " and " substr(args[1],2) "," args[2]; next
pascal@20458 264 }
pascal@20458 265 }
pascal@20543 266 if (/^ add word ptr/ || /^ sub word ptr/ ||
pascal@20544 267 /^ add [bcd]x,/ || /^ sub [bcd]x,/) {
pascal@20542 268 split($0,args,",")
pascal@20542 269 if (isnum(args[2]) && (args[2] % 256 == 0)) {
pascal@20544 270 sub(/word ptr/,"byte ptr",s); sub(/x,/,"h,",s) ||
pascal@20543 271 sub(/\],/,"+1],",s) || sub(/,/,"+1,",s)
pascal@20542 272 print s "/256"; next
pascal@20542 273 }
pascal@20542 274 }
pascal@20546 275 if (/^ add dword ptr/ || /^ sub dword ptr/) {
pascal@20458 276 split($0,args,",")
pascal@20543 277 if (args[2] == "large") { args[2] = $3 }
pascal@20458 278 if (isnum(args[2])) {
pascal@20546 279 if (args[2] % 16777216 == 0) {
pascal@20546 280 sub(/dword/,"byte",s)
pascal@20543 281 sub(/\],/,"+3],",s) || sub(/,/,"+3,",s)
pascal@20458 282 print s "/16777216"; next
pascal@20458 283 }
pascal@20458 284 if (args[2] % 65536 == 0) {
pascal@20546 285 sub(/dword/,"word",s)
pascal@20543 286 sub(/\],/,"+2],",s) || sub(/,/,"+2,",s)
pascal@20458 287 print s "/65536"; next
pascal@20458 288 }
pascal@20458 289 }
pascal@20458 290 }
pascal@20458 291 if (/^ mov e.x,/) {
pascal@20458 292 split($2,args,",")
pascal@20458 293 r=args[1]
pascal@20458 294 if (args[2] == "large") { args[2] = $3 }
pascal@20458 295 if (isnum(args[2]) && args[2] % 65536 == args[2]) {
pascal@20458 296 if (args[2] % 256 == args[2] || args[2] % 256 == 0) {
pascal@20458 297 print " xor " r "," r
pascal@20458 298 if (args[2] == 0) next
pascal@20458 299 x=" mov " substr(r,2,1)
pascal@20458 300 if (args[2] % 256 == 0) {
pascal@20458 301 print x "h," args[2] "/256"
pascal@20458 302 }
pascal@20458 303 else { print x "l," args[2] }
pascal@20458 304 next
pascal@20458 305 }
pascal@20458 306 }
pascal@20458 307 }
pascal@20458 308 print
pascal@20458 309 }