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LLVM 5.0
author kono
date Fri, 27 Oct 2017 17:07:41 +0900
parents 1172e4bd9c6f
children
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
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95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
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1 #!/bin/bash
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2 #
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3 # findoptdiff
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4 #
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5 # This script helps find the optimization difference between two llvm
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6 # builds. It is useful when you have a build that is known to work and
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7 # one that exhibits an optimization problem. Identifying the difference
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8 # between the two builds can lead to discovery of the source of a
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9 # mis-optimization.
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10 #
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11 # The script takes two llvm build paths as arguments. These specify the
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12 # the two llvm builds to compare. It is generally expected that they
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13 # are "close cousins". That is, they are the same except that the
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14 # second build contains some experimental optimization features that
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15 # are suspected of producing a misoptimization.
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16 #
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17 # The script takes two bitcode files, one from each build. They are
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18 # presumed to be a compilation of the same program or program fragment
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19 # with the only difference being the builds.
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20 #
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21 # The script operates by iteratively applying the optimizations that gccas
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22 # and gccld run until there is a difference in the assembly resulting
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23 # from the optimization. The difference is then reported with the set of
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24 # optimization passes that produce the difference. The processing
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25 # continues until all optimization passes have been tried. The differences
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26 # for each pass, if they do differ, are placed in a diffs.# file.
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27 #
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28 # To work around differences in the assembly language format, the script
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29 # can also take two filter arguments that post-process the assembly
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30 # so they can be differenced without making false positives for known
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31 # differences in the two builds. These filters are optional.
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32 #
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33 # Usage:
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34 # findoptdiff llvm1 llvm2 bc1 bc2 filter1 filter2
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35 #
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36 # Where:
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37 # llvm1
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38 # is the path to the first llvm build dir
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39 # llvm2
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40 # is the path to the second llvm build dir
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41 # bc1
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42 # is the bitcode file for the first llvm environment
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43 # bc2
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44 # is the bitcode file for the second llvm environment
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45 # filter1
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46 # is an optional filter for filtering the llvm1 generated assembly
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47 # filter2
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48 # is an optional filter for filtering the llvm2 generated assembly
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49 #
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50 llvm1=$1
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51 llvm2=$2
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52 bc1=$3
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53 bc2=$4
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54 filt1=$5
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55 filt2=$6
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56 if [ -z "$filt1" ] ; then
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57 filt1="cat"
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58 fi
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59 if [ -z "$filt2" ] ; then
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60 filt2="cat"
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61 fi
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62 opt1="${bc1}.opt"
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63 opt2="${bc2}.opt"
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64 ll1="${bc1}.ll"
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65 ll2="${bc2}.ll"
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66 opt1ll="${bc1}.opt.ll"
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67 opt2ll="${bc2}.opt.ll"
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68 dis1="$llvm1/Debug/bin/llvm-dis"
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69 dis2="$llvm2/Debug/bin/llvm-dis"
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70 opt1="$llvm1/Debug/bin/opt"
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71 opt2="$llvm2/Debug/bin/opt"
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72
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73 all_switches="-verify -lowersetjmp -simplifycfg -mem2reg -globalopt -globaldce -ipconstprop -deadargelim -instcombine -simplifycfg -prune-eh -inline -simplify-libcalls -argpromotion -tailduplicate -simplifycfg -sroa -instcombine -predsimplify -condprop -tailcallelim -simplifycfg -reassociate -licm -loop-unswitch -instcombine -indvars -loop-unroll -instcombine -load-vn -gcse -sccp -instcombine -condprop -dse -dce -simplifycfg -deadtypeelim -constmerge -internalize -ipsccp -globalopt -constmerge -deadargelim -inline -prune-eh -globalopt -globaldce -argpromotion -instcombine -predsimplify -sroa -globalsmodref-aa -licm -load-vn -gcse -dse -instcombine -simplifycfg -verify"
0
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74
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75 #counter=0
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76 function tryit {
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77 switches_to_use="$1"
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78 $opt1 $switches_to_use "$bc1" -o - | $dis1 | $filt1 > "$opt1ll"
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79 $opt2 $switches_to_use "$bc2" -o - | $dis2 | $filt2 > "$opt2ll"
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80 diffs="diffs."$((counter++))
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81 diff "$opt1ll" "$opt2ll" > $diffs
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82 if [ $? -ne 0 ] ; then
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83 echo
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84 echo "Diff fails with these switches:"
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85 echo $switches
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86 echo "Differences:"
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87 head $diffs
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88 echo 'Switches:' $switches_to_use >> $diffs
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89 else
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90 rm $diffs
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91 fi
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92 return 1
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93 }
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94
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95 for sw in $all_switches ; do
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96 echo -n " $sw"
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97 switches="$switches $sw"
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98 if tryit "$switches" ; then
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99 break;
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100 fi
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101 done