rev |
line source |
pascal@20458
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1 BEGIN { hold=0 }
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pascal@20458
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2 function isnum(n) { return match(n,/^[0-9+-]/) }
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pascal@20458
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3 {
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pascal@20458
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4 if (hold == 0) {
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pascal@20458
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5 s=$0
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pascal@20458
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6 if (/^ mov .x,bx$/ || /^ mov .x,.i$/) {
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pascal@20458
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7 hold=1; split($2,regs,","); next
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pascal@20458
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8 }
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pascal@20458
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9 if (/^ inc e?.[ix]/ || /^ dec e?.[ix]/) {
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pascal@20458
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10 hold=2; r=$2; next
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pascal@20458
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11 }
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pascal@20458
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12 if (/^ mov [abcds][ix],/ && ! /,.s/) {
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pascal@20458
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13 hold=3; split($2,regs,","); next
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pascal@20458
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14 }
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pascal@20458
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15 if (/^ movzx eax,ax$/) { hold=4; next }
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pascal@20458
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16 if (0) {
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pascal@20458
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17 if (/^ cmp dx,-1$/) { hold=10; next }
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pascal@20458
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18 }
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pascal@20458
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19 }
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pascal@20458
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20 else if (hold == 1) {
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pascal@20458
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21 hold=0; split($2,args,","); op=""
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pascal@20458
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22 if ($1 == "add") op="+"
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pascal@20458
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23 if ($1 == "sub") op="-"
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pascal@20458
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24 if (op != "" && regs[1] == args[1] && isnum(args[2])) {
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pascal@20458
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25 print "\tlea\t" regs[1] ",[" regs[2] op args[2] "]"
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pascal@20458
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26 next
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pascal@20458
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27 }
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pascal@20458
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28 print "\tmov\t" regs[1] "," regs[2]
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pascal@20458
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29 }
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pascal@20458
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30 else if (hold == 2) {
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pascal@20458
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31 hold=0; split($2,args,","); print s
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pascal@20458
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32 if ($1 == "or" && r == args[1] && r == args[2]) next # don't clear C ...
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pascal@20458
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33 }
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pascal@20458
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34 else if (hold == 3) {
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pascal@20458
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35 hold=0
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pascal@20458
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36 if (/^ add [abcds][ix],/ || /^ sub [abcds][ix],/) {
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pascal@20458
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37 split($2,regs2,",")
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pascal@20458
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38 if (regs[1] == regs2[1] && (regs2[2] == "offset" || isnum(regs2[2]))) {
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pascal@20458
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39 t=$0; sub(/mov/,$1,s)
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pascal@20458
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40 if ($1 == "add") sub(/add/,"mov",t); else sub(/sub/,"mov",t)
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pascal@20458
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41 print t; print s; next
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pascal@20458
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42 }
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pascal@20458
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43 }
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pascal@20458
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44 print s
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pascal@20458
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45 }
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pascal@20458
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46 else if (hold == 4) {
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pascal@20458
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47 hold=0
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pascal@20458
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48 if (/^ push eax$/) {
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pascal@20458
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49 print " push 0"; print " push ax"; next
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pascal@20458
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50 } else { print s }
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pascal@20458
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51 }
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pascal@20458
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52 else if (hold == 10) {
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pascal@20458
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53 if ($1 == "je" || $1 == "jne") { s2=$0; cmp=$1; hold++; next }
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pascal@20458
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54 hold=0; print s
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pascal@20458
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55 }
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pascal@20458
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56 else if (hold == 11) {
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pascal@20458
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57 if (/^ cmp ax,-1$/) { s3=$0; hold++; next }
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pascal@20458
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58 hold=0; print s; print s2
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pascal@20458
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59 }
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pascal@20458
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60 else if (hold == 12) {
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pascal@20458
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61 if (($1 == "je" || $1 == "jne") && $1 != cmp) {
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pascal@20458
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62 print " and ax,dx"; print " inc ax"
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pascal@20458
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63 } else { print s; print s2; print s3 }
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pascal@20458
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64 hold=0
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pascal@20458
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65 }
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pascal@20458
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66 s=$0
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pascal@20458
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67 # These optimisation may break ZF or CF
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pascal@20458
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68 if (/^ add sp,4/) { print " pop cx"; print " pop cx"; next }
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pascal@20458
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69 if (/^ mov d*word ptr .*,0$/ || /^ mov dword ptr .*,large 0$/) {
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pascal@20458
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70 sub(/mov/,"and",s); print s; next # slower
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pascal@20458
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71 }
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pascal@20458
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72 if (/^ mov d*word ptr .*,-1$/ || /^ mov dword ptr .*,large -1$/) {
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pascal@20458
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73 sub(/mov/,"or",s); print s; next # slower
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pascal@20458
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74 }
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pascal@20458
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75 if (/^ or .*,0$/ || /^ and .*,-1$/) next
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pascal@20458
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76 if (/^ or [abcd]x,/) {
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pascal@20458
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77 split($2,args,",")
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pascal@20458
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78 if (isnum(args[2]) && args[2] >= 0 && args[2] < 256) {
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pascal@20458
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79 print " or " substr(args[1],1,1) "l," args[2]; next
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pascal@20458
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80 }
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pascal@20458
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81 }
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pascal@20458
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82 if (/^ and [abcd]x,/) {
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pascal@20458
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83 split($2,args,",")
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pascal@20458
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84 if (isnum(args[2]) && args[2] >= -255 && args[2] < 0) {
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pascal@20458
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85 print " and " substr(args[1],1,1) "l," args[2]; next
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pascal@20458
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86 }
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pascal@20458
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87 }
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pascal@20458
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88 if (/^ or e[abcd]x,/) {
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pascal@20458
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89 split($2,args,",")
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pascal@20458
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90 if (args[2] == "large") { args[2] = $3 }
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pascal@20458
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91 if (isnum(args[2]) && args[2] >= 0 && args[2] < 256) {
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pascal@20458
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92 print " or " substr(args[1],2,1) "l," args[2]; next
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pascal@20458
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93 }
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pascal@20458
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94 }
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pascal@20458
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95 if (/^ and e[abcd]x,/) {
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pascal@20458
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96 split($2,args,",")
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pascal@20458
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97 if (args[2] == "large") { args[2] = $3 }
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pascal@20458
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98 if (isnum(args[2]) && args[2] >= -255 && args[2] < 0) {
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pascal@20458
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99 print " and " substr(args[1],2,1) "l," args[2]; next
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pascal@20458
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100 }
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pascal@20458
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101 }
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pascal@20458
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102 if (/^ or e[abcds][ix],/) {
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pascal@20458
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103 split($2,args,",")
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pascal@20458
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104 if (args[2] == "large") { args[2] = $3 }
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pascal@20458
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105 if (isnum(args[2]) && args[2] >= 0 && args[2] < 65536) {
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pascal@20458
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106 print " or " substr(args[1],2) "," args[2]; next
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pascal@20458
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107 }
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pascal@20458
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108 }
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pascal@20458
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109 if (/^ and e[abcds][ix],/) {
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pascal@20458
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110 split($2,args,",")
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pascal@20458
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111 if (args[2] == "large") { args[2] = $3 }
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pascal@20458
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112 if (isnum(args[2]) && args[2] >= -65535 && args[2] < 0) {
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pascal@20458
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113 print " and " substr(args[1],2) "," args[2]; next
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pascal@20458
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114 }
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pascal@20458
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115 }
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pascal@20458
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116 if (/^ add word ptr/ || /^ sub word ptr/) {
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pascal@20458
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117 split($0,args,",")
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pascal@20458
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118 if (isnum(args[2]) && (args[2] % 256 == 0)) {
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pascal@20458
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119 sub(/word/,"byte",s); sub(/\]/,"+1]",s)
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pascal@20458
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120 print s "/256"; next
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pascal@20458
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121 }
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pascal@20458
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122 }
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pascal@20458
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123 if (/^ add dword ptr/ || /^ sub dword ptr/) {
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pascal@20458
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124 split($0,args,",")
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pascal@20458
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125 if (args[2] == "large") { split(args[2],args," ") }
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pascal@20458
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126 if (isnum(args[2])) {
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pascal@20458
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127 if (args[2] % 16777216 == 0) {
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pascal@20458
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128 sub(/dword/,"byte",s); sub(/\]/,"+3]",s)
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pascal@20458
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129 print s "/16777216"; next
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pascal@20458
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130 }
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pascal@20458
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131 if (args[2] % 65536 == 0) {
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pascal@20458
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132 sub(/dword/,"word",s); sub(/\]/,"+2]",s)
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pascal@20458
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133 print s "/65536"; next
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pascal@20458
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134 }
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pascal@20458
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135 }
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pascal@20458
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136 }
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pascal@20458
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137 if (/^ mov e.x,/) {
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pascal@20458
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138 split($2,args,",")
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pascal@20458
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139 r=args[1]
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pascal@20458
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140 if (args[2] == "large") { args[2] = $3 }
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pascal@20458
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141 if (isnum(args[2]) && args[2] % 65536 == args[2]) {
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pascal@20458
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142 if (args[2] % 256 == args[2] || args[2] % 256 == 0) {
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pascal@20458
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143 print " xor " r "," r
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pascal@20458
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144 if (args[2] == 0) next
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pascal@20458
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145 x=" mov " substr(r,2,1)
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pascal@20458
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146 if (args[2] % 256 == 0) {
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pascal@20458
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147 print x "h," args[2] "/256"
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pascal@20458
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148 }
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pascal@20458
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149 else { print x "l," args[2] }
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pascal@20458
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150 next
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pascal@20458
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151 }
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pascal@20458
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152 }
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pascal@20458
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153 }
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pascal@20458
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154 print
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pascal@20458
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155 }
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