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author | Reid Spencer <rspencer@reidspencer.com> | 2006-11-09 00:26:17 +0000 |
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committer | Reid Spencer <rspencer@reidspencer.com> | 2006-11-09 00:26:17 +0000 |
commit | 28b7c7feab6219f4c9c7efc3b71a0a3f4880a14d (patch) | |
tree | e49c3e0433842bc3385cc6c19e51e76a2a88858a /utils/findmisopt | |
parent | 3ebb5a1cb894c2ca3d15bf511462cf06156d0073 (diff) | |
download | external_llvm-28b7c7feab6219f4c9c7efc3b71a0a3f4880a14d.zip external_llvm-28b7c7feab6219f4c9c7efc3b71a0a3f4880a14d.tar.gz external_llvm-28b7c7feab6219f4c9c7efc3b71a0a3f4880a14d.tar.bz2 |
Add a utility script to find a mis-optimization problem. This sometimes
helps when bugpoint can't find the problem directly because it needs the
set of optimizations that cause the program to fail.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@31580 91177308-0d34-0410-b5e6-96231b3b80d8
Diffstat (limited to 'utils/findmisopt')
-rwxr-xr-x | utils/findmisopt | 125 |
1 files changed, 125 insertions, 0 deletions
diff --git a/utils/findmisopt b/utils/findmisopt new file mode 100755 index 0000000..15d7209 --- /dev/null +++ b/utils/findmisopt @@ -0,0 +1,125 @@ +#!/bin/bash +# +# findmisopt +# +# This is a quick and dirty hack to potentially find a misoptimization +# problem. Mostly its to work around problems in bugpoint that prevent +# it from finding a problem unless the set of failing optimizations are +# known and given to it on the command line. +# +# Given a bytecode file that produces correct output (or return code), +# this script will run through all the optimizations passes that gccas +# uses (in the same order) and will narrow down which optimizations +# cause the program either generate different output or return a +# different result code. When the passes have been narrowed down, +# bugpoint is invoked to further refine the problem to its origin. +# +# Usage: +# findmisopt bcfile outdir progargs [match] +# +# Where: +# bcfile +# is the bytecode file input (the unoptimized working case) +# outdir +# is a directory into which intermediate results are placed +# progargs +# is a single argument containing all the arguments the program needs +# match +# if specified to any value causes the result code of the program to +# be used to determine success/fail. If not specified success/fail is +# determined by diffing the program's output with the non-optimized +# output. +# +bcfile="$1" +outdir="$2" +args="$3" +match="$4" +name=`basename $bcfile .bc` +ll="$outdir/${name}.ll" +s="$outdir/${name}.s" +prog="$outdir/${name}" +out="$outdir/${name}.out" +optbc="$outdir/${name}.opt.bc" +optll="$outdir/${name}.opt.ll" +opts="$outdir/${name}.opt.s" +optprog="$outdir/${name}.opt" +optout="$outdir/${name}.opt.out" + +echo "Test Name: $name" +echo "Unoptimized program: $prog" +echo " Optimized program: $optprog" + + +# Generate the disassembly +llvm-dis "$bcfile" -o "$ll" -f || exit 1 + +# Generate the non-optimized program +llc "$bcfile" -o "$s" -f || exit 1 +gcc "$s" -o "$prog" || exit 1 + +# Define the list of optimizations to run +all_switches="-verify -lowersetjmp -funcresolve -raiseallocs -simplifycfg -mem2reg -globalopt -globaldce -ipconstprop -deadargelim -instcombine -simplifycfg -prune-eh -inline -simplify-libcalls -argpromotion -raise -tailduplicate -simplifycfg -scalarrepl -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" + +# Current set of switches is empty +function tryit { + switches_to_use="$1" + opt $switches_to_use "$bcfile" -o "$optbc" -f || exit + llvm-dis "$optbc" -o "$optll" -f || exit + llc "$optbc" -o "$opts" -f || exit + gcc "$opts" -o "$optprog" || exit + "$prog" $args > "$out" + ex1=$? + "$optprog" $args > "$optout" + ex2=$? + + if [ -n "$match" ] ; then + if [ "$ex1" -ne "$ex2" ] ; then + echo "Return code not the same with these switches:" + echo $switches + echo "Unoptimized returned: $ex1" + echo "Optimized returned: $ex2" + return 0 + fi + else + diff "$out" "$optout" > /dev/null + if [ $? -ne 0 ] ; then + echo "Diff fails with these switches:" + echo $switches + echo "Differences:" + diff "$out" "$optout" + return 0; + fi + fi + return 1 +} + +for sw in $all_switches ; do + switches="$switches $sw" + if tryit "$switches" ; then + break; + fi +done + +final="" +while [ ! -z "$switches" ] ; do + trimmed=`echo "$switches" | sed -e 's/^ *\(-[^ ]*\).*/\1/'` + switches=`echo "$switches" | sed -e 's/^ *-[^ ]* *//'` + echo "Trimmed $trimmed from left" + tryit "$final $switches" + if [ "$?" -eq "0" ] ; then + echo "Still Failing .. continuing ..." + continue + else + echo "Found required early pass: $trimmed" + final="$final $trimmed" + continue + fi + echo "Next Loop" +done + +echo "Smallest Optimization list= $final" +bpcmd="bugpoint -run-llc --output "$out" --input /dev/null $bcfile $final --args $args" + +echo "Running: $bpcmd" +$bpcmd +echo "Finished." |