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ce3655671a
As far as I know, ipconstprop has not been used in years and ipsccp has been used instead. This has the potential for confusion and sometimes leads people to spend time finding & reporting bugs as well as updating it to work with the latest API changes. This patch moves the tests over to SCCP. There's one functional difference I am aware of: ipconstprop propagates for each call-site individually, so for functions that are called with different constant arguments it can sometimes produce better results than ipsccp (at much higher compile-time cost).But IPSCCP can be thought to do so as well for internal functions and as mentioned earlier, the pass seems unused in practice (and there are no plans on working towards enabling it anytime). Also discussed on llvm-dev: http://lists.llvm.org/pipermail/llvm-dev/2020-July/143773.html Reviewed By: jdoerfert Differential Revision: https://reviews.llvm.org/D84447
102 lines
3.8 KiB
Bash
Executable File
102 lines
3.8 KiB
Bash
Executable File
#!/bin/bash
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#
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# findoptdiff
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#
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# This script helps find the optimization difference between two llvm
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# builds. It is useful when you have a build that is known to work and
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# one that exhibits an optimization problem. Identifying the difference
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# between the two builds can lead to discovery of the source of a
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# mis-optimization.
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#
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# The script takes two llvm build paths as arguments. These specify the
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# the two llvm builds to compare. It is generally expected that they
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# are "close cousins". That is, they are the same except that the
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# second build contains some experimental optimization features that
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# are suspected of producing a misoptimization.
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#
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# The script takes two bitcode files, one from each build. They are
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# presumed to be a compilation of the same program or program fragment
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# with the only difference being the builds.
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#
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# The script operates by iteratively applying the optimizations that gccas
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# and gccld run until there is a difference in the assembly resulting
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# from the optimization. The difference is then reported with the set of
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# optimization passes that produce the difference. The processing
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# continues until all optimization passes have been tried. The differences
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# for each pass, if they do differ, are placed in a diffs.# file.
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#
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# To work around differences in the assembly language format, the script
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# can also take two filter arguments that post-process the assembly
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# so they can be differenced without making false positives for known
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# differences in the two builds. These filters are optional.
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#
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# Usage:
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# findoptdiff llvm1 llvm2 bc1 bc2 filter1 filter2
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#
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# Where:
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# llvm1
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# is the path to the first llvm build dir
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# llvm2
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# is the path to the second llvm build dir
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# bc1
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# is the bitcode file for the first llvm environment
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# bc2
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# is the bitcode file for the second llvm environment
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# filter1
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# is an optional filter for filtering the llvm1 generated assembly
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# filter2
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# is an optional filter for filtering the llvm2 generated assembly
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#
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llvm1=$1
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llvm2=$2
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bc1=$3
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bc2=$4
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filt1=$5
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filt2=$6
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if [ -z "$filt1" ] ; then
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filt1="cat"
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fi
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if [ -z "$filt2" ] ; then
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filt2="cat"
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fi
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opt1="${bc1}.opt"
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opt2="${bc2}.opt"
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ll1="${bc1}.ll"
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ll2="${bc2}.ll"
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opt1ll="${bc1}.opt.ll"
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opt2ll="${bc2}.opt.ll"
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dis1="$llvm1/Debug/bin/llvm-dis"
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dis2="$llvm2/Debug/bin/llvm-dis"
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opt1="$llvm1/Debug/bin/opt"
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opt2="$llvm2/Debug/bin/opt"
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all_switches="-verify -lowersetjmp -simplifycfg -mem2reg -globalopt -globaldce -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"
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#counter=0
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function tryit {
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switches_to_use="$1"
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$opt1 $switches_to_use "$bc1" -o - | $dis1 | $filt1 > "$opt1ll"
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$opt2 $switches_to_use "$bc2" -o - | $dis2 | $filt2 > "$opt2ll"
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diffs="diffs."$((counter++))
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diff "$opt1ll" "$opt2ll" > $diffs
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if [ $? -ne 0 ] ; then
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echo
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echo "Diff fails with these switches:"
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echo $switches
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echo "Differences:"
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head $diffs
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echo 'Switches:' $switches_to_use >> $diffs
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else
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rm $diffs
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fi
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return 1
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}
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for sw in $all_switches ; do
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echo -n " $sw"
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switches="$switches $sw"
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if tryit "$switches" ; then
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break;
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fi
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done
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