wok annotate linld/stuff/src/pipehole.awk @ rev 20751

Add libsbc
author Pascal Bellard <pascal.bellard@slitaz.org>
date Tue Feb 12 12:12:36 2019 +0100 (2019-02-12)
parents 57d97be431f4
children 87b6697bb350
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@20751 44 if ($1 == "inc") { op="+"; args[2]="1"; }
pascal@20751 45 if ($1 == "dec") { op="-"; args[2]="1"; }
pascal@20543 46 if (op != "" && regs[1] == args[1]) {
pascal@20543 47 if (isnum(args[2])) {
pascal@20630 48 for (i = kept++; i > 0; i--) line[i] = line[i-1]
pascal@20630 49 line[0] = "\tlea\t" regs[1] ",[" regs[2] op args[2] "]"
pascal@20630 50 hold=10; next
pascal@20543 51 }
pascal@20543 52 line[kept++]=$0
pascal@20543 53 hold=1
pascal@20458 54 next
pascal@20458 55 }
pascal@20520 56 if (/^ pop [ds]i/ && regs[2] ~ /^[ds]i$/) {
pascal@20520 57 print " xchg " r
pascal@20520 58 }
pascal@20543 59 else print s
pascal@20543 60 for (i = 0; i < kept; i++) print line[i]; kept=0
pascal@20458 61 }
pascal@20458 62 else if (hold == 2) {
pascal@20458 63 hold=0; split($2,args,","); print s
pascal@20458 64 if ($1 == "or" && r == args[1] && r == args[2]) next # don't clear C ...
pascal@20458 65 }
pascal@20458 66 else if (hold == 3) {
pascal@20458 67 hold=0
pascal@20542 68 if (/^ add [abcds][ix],/) {
pascal@20458 69 split($2,regs2,",")
pascal@20458 70 if (regs[1] == regs2[1] && (regs2[2] == "offset" || isnum(regs2[2]))) {
pascal@20549 71 t=$0; sub(/mov/,$1,s); sub(/add/,"mov",t)
pascal@20458 72 print t; print s; next
pascal@20458 73 }
pascal@20458 74 }
pascal@20458 75 print s
pascal@20458 76 }
pascal@20458 77 else if (hold == 4) {
pascal@20458 78 hold=0
pascal@20458 79 if (/^ push eax$/) {
pascal@20458 80 print " push 0"; print " push ax"; next
pascal@20458 81 } else { print s }
pascal@20458 82 }
pascal@20543 83 else if (hold == 5) {
pascal@20543 84 hold=0
pascal@20543 85 if ($1 == "jae" || $1 == "jb") {
pascal@20544 86 sub(/word ptr/,"byte ptr",s); sub(/x,/,"h,",s) ||
pascal@20543 87 sub(/\],/,"+1],",s) || sub(/,/,"+1,",s)
pascal@20543 88 s = s "/256"
pascal@20543 89 }
pascal@20543 90 print s
pascal@20543 91 }
pascal@20630 92 else if (hold == 6) {
pascal@20630 93 if (($1 == "and" || $1 == "add") && $2 ~ /^ax,/) {
pascal@20630 94 line[kept++]=$0
pascal@20630 95 next
pascal@20630 96 }
pascal@20630 97 p=$0
pascal@20630 98 if (/^ movzx eax,ax$/) {
pascal@20630 99 s=" mov eax,cs"; p=""
pascal@20630 100 }
pascal@20630 101 print s
pascal@20630 102 for (i = 0; i < kept; i++) print line[i]; kept=0
pascal@20630 103 if (p != "") print p
pascal@20630 104 hold=0; next
pascal@20630 105 }
pascal@20630 106 else if (hold == 7) {
pascal@20458 107 hold=0
pascal@20520 108 if (/^ call near ptr N_LXURSH@$/) {
pascal@20520 109 print " extrn N_LXURSH@4:near"
pascal@20520 110 print " call near ptr N_LXURSH@4"
pascal@20520 111 next
pascal@20520 112 }
pascal@20528 113 if (/^ call near ptr N_LXLSH@$/) {
pascal@20528 114 print " extrn N_LXLSH@4:near"
pascal@20528 115 print " call near ptr N_LXLSH@4"
pascal@20528 116 next
pascal@20528 117 }
pascal@20520 118 print s
pascal@20458 119 }
pascal@20630 120 else if (hold == 8) {
pascal@20630 121 if ($1 == "je" || $1 == "jne") { p=$0; hold=9; next }
pascal@20630 122 hold=0
pascal@20630 123 print s
pascal@20630 124 }
pascal@20630 125 else if (hold == 9) {
pascal@20630 126 hold=0; split($2,args,",")
pascal@20630 127 if (/^ mov ax,/ && args[2] == regs[1]) {
pascal@20630 128 print; print " or ax,ax"; print p; next
pascal@20630 129 }
pascal@20630 130 print s; print p;
pascal@20630 131 }
pascal@20630 132 else if (hold == 10) {
pascal@20751 133 split($2,args,","); op=""
pascal@20751 134 if ($1 == "add") op="+"
pascal@20751 135 if ($1 == "sub") op="-"
pascal@20751 136 if ($1 == "inc") { op="+"; args[2]="1"; }
pascal@20751 137 if ($1 == "dec") { op="-"; args[2]="1"; }
pascal@20751 138 if (op != "" && isnum(args[2])) {
pascal@20751 139 split(line[0],reg,",")
pascal@20751 140 if (substr(reg[1],length(reg[1])-1,2) == args[1]) {
pascal@20751 141 line[0] = substr(line[0],1,length(line[0])-1) op args[2] "]"
pascal@20751 142 next
pascal@20751 143 }
pascal@20751 144 }
pascal@20630 145 hold=0
pascal@20630 146 if (/^ mov [sd]i,ax$/) {
pascal@20630 147 split($2,args,",")
pascal@20630 148 for (i = 0; i < kept; i++) {
pascal@20630 149 sub(/ax/,args[1],line[i]); print line[i]
pascal@20630 150 }
pascal@20630 151 next
pascal@20630 152 }
pascal@20630 153 for (i = 0; i < kept; i++) print line[i]
pascal@20630 154 }
pascal@20634 155 else if (hold == 11) {
pascal@20634 156 if (/^ inc ax$/ || /^ dec ax$/) {
pascal@20634 157 line[kept++]=$0; next
pascal@20634 158 }
pascal@20634 159 split($2,args,",")
pascal@20634 160 if (/^ mov cl,/) {
pascal@20634 161 split($2,args,",")
pascal@20634 162 if (args[2] >= 8) {
pascal@20634 163 line[kept++]=$0; next
pascal@20634 164 }
pascal@20634 165 }
pascal@20634 166 if (!/^ shl ax,/ || (args[2] != "cl" && args[2] < 8)) {
pascal@20634 167 print " cbw "
pascal@20634 168 }
pascal@20634 169 for (i = 0; i < kept; i++) print line[i]
pascal@20634 170 hold=kept=0
pascal@20634 171 }
pascal@20634 172 else if (hold == 12) {
pascal@20634 173 hold=0
pascal@20634 174 if ($1 != "adc" && $1 != "sbb" && ! /^ jn?[abc]/) {
pascal@20634 175 print " inc " regs[1]
pascal@20634 176 print " inc " regs[1]
pascal@20634 177 }
pascal@20634 178 else print " add " regs[1] ",2"
pascal@20634 179 }
pascal@20634 180 else if (hold == 13) {
pascal@20634 181 hold=0
pascal@20634 182 if ($1 != "adc" && $1 != "sbb" && ! /^ jn?[abc]/) {
pascal@20634 183 print " dec " regs[1]
pascal@20634 184 print " dec " regs[1]
pascal@20634 185 }
pascal@20634 186 else print " sub " regs[1] ",2"
pascal@20634 187 }
pascal@20458 188 s=$0
pascal@20458 189 # These optimisation may break ZF or CF
pascal@20485 190 if (/^ sub sp,2$/) { print " push ax"; next }
pascal@20485 191 if (/^ sub sp,4$/) { print " push ax"; print " push ax"; next }
pascal@20485 192 if (/^ add sp,4$/) { print " pop cx"; print " pop cx"; next }
pascal@20458 193 if (/^ mov d*word ptr .*,0$/ || /^ mov dword ptr .*,large 0$/) {
pascal@20458 194 sub(/mov/,"and",s); print s; next # slower
pascal@20458 195 }
pascal@20458 196 if (/^ mov d*word ptr .*,-1$/ || /^ mov dword ptr .*,large -1$/) {
pascal@20458 197 sub(/mov/,"or",s); print s; next # slower
pascal@20458 198 }
pascal@20458 199 if (/^ or .*,0$/ || /^ and .*,-1$/) next
pascal@20458 200 if (/^ or [abcd]x,/) {
pascal@20458 201 split($2,args,",")
pascal@20458 202 if (isnum(args[2]) && args[2] >= 0 && args[2] < 256) {
pascal@20458 203 print " or " substr(args[1],1,1) "l," args[2]; next
pascal@20458 204 }
pascal@20458 205 }
pascal@20458 206 if (/^ and [abcd]x,/) {
pascal@20458 207 split($2,args,",")
pascal@20459 208 if (isnum(args[2]) && args[2] >= -256 && args[2] < 0) {
pascal@20458 209 print " and " substr(args[1],1,1) "l," args[2]; next
pascal@20458 210 }
pascal@20458 211 }
pascal@20458 212 if (/^ or e[abcd]x,/) {
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] < 256) {
pascal@20458 216 print " or " substr(args[1],2,1) "l," args[2]; next
pascal@20458 217 }
pascal@20458 218 }
pascal@20458 219 if (/^ and e[abcd]x,/) {
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] >= -256 && args[2] < 0) {
pascal@20458 223 print " and " substr(args[1],2,1) "l," args[2]; next
pascal@20458 224 }
pascal@20458 225 }
pascal@20458 226 if (/^ or e[abcds][ix],/) {
pascal@20458 227 split($2,args,",")
pascal@20458 228 if (args[2] == "large") { args[2] = $3 }
pascal@20458 229 if (isnum(args[2]) && args[2] >= 0 && args[2] < 65536) {
pascal@20458 230 print " or " substr(args[1],2) "," args[2]; next
pascal@20458 231 }
pascal@20458 232 }
pascal@20458 233 if (/^ and e[abcds][ix],/) {
pascal@20458 234 split($2,args,",")
pascal@20458 235 if (args[2] == "large") { args[2] = $3 }
pascal@20459 236 if (isnum(args[2]) && args[2] >= -65536 && args[2] < 0) {
pascal@20458 237 print " and " substr(args[1],2) "," args[2]; next
pascal@20458 238 }
pascal@20458 239 }
pascal@20543 240 if (/^ add word ptr/ || /^ sub word ptr/ ||
pascal@20544 241 /^ add [bcd]x,/ || /^ sub [bcd]x,/) {
pascal@20542 242 split($0,args,",")
pascal@20542 243 if (isnum(args[2]) && (args[2] % 256 == 0)) {
pascal@20544 244 sub(/word ptr/,"byte ptr",s); sub(/x,/,"h,",s) ||
pascal@20543 245 sub(/\],/,"+1],",s) || sub(/,/,"+1,",s)
pascal@20542 246 print s "/256"; next
pascal@20542 247 }
pascal@20542 248 }
pascal@20546 249 if (/^ add dword ptr/ || /^ sub dword ptr/) {
pascal@20458 250 split($0,args,",")
pascal@20543 251 if (args[2] == "large") { args[2] = $3 }
pascal@20458 252 if (isnum(args[2])) {
pascal@20546 253 if (args[2] % 16777216 == 0) {
pascal@20546 254 sub(/dword/,"byte",s)
pascal@20543 255 sub(/\],/,"+3],",s) || sub(/,/,"+3,",s)
pascal@20458 256 print s "/16777216"; next
pascal@20458 257 }
pascal@20458 258 if (args[2] % 65536 == 0) {
pascal@20546 259 sub(/dword/,"word",s)
pascal@20543 260 sub(/\],/,"+2],",s) || sub(/,/,"+2,",s)
pascal@20458 261 print s "/65536"; next
pascal@20458 262 }
pascal@20458 263 }
pascal@20458 264 }
pascal@20458 265 if (/^ mov e.x,/) {
pascal@20458 266 split($2,args,",")
pascal@20458 267 r=args[1]
pascal@20458 268 if (args[2] == "large") { args[2] = $3 }
pascal@20458 269 if (isnum(args[2]) && args[2] % 65536 == args[2]) {
pascal@20458 270 if (args[2] % 256 == args[2] || args[2] % 256 == 0) {
pascal@20458 271 print " xor " r "," r
pascal@20458 272 if (args[2] == 0) next
pascal@20458 273 x=" mov " substr(r,2,1)
pascal@20458 274 if (args[2] % 256 == 0) {
pascal@20458 275 print x "h," args[2] "/256"
pascal@20458 276 }
pascal@20458 277 else { print x "l," args[2] }
pascal@20458 278 next
pascal@20458 279 }
pascal@20458 280 }
pascal@20458 281 }
pascal@20458 282 print
pascal@20458 283 }