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authorReid Spencer <rspencer@reidspencer.com>2006-11-09 00:26:17 +0000
committerReid Spencer <rspencer@reidspencer.com>2006-11-09 00:26:17 +0000
commit28b7c7feab6219f4c9c7efc3b71a0a3f4880a14d (patch)
treee49c3e0433842bc3385cc6c19e51e76a2a88858a /utils/findmisopt
parent3ebb5a1cb894c2ca3d15bf511462cf06156d0073 (diff)
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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-xutils/findmisopt125
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."