It's not necessary to do rounding for alloca operations when the requested

alignment is equal to the stack alignment.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@40004 91177308-0d34-0410-b5e6-96231b3b80d8

1 files changed, 101 insertions, 0 deletions

diff --git a/utils/findoptdiff b/utils/findoptdiff
new file mode 100755
index 0000000..36620d9
--- /dev/null
+++ b/utils/findoptdiff
@@ -0,0 +1,101 @@
+#!/bin/bash
+#
+#  findoptdiff
+#
+#      This script helps find the optimization difference between two llvm
+#      builds. It is useful when you have a build that is known to work and
+#      one that exhibits an optimization problem. Identifying the difference
+#      between the two builds can lead to discovery of the source of a
+#      mis-optimization.
+#
+#      The script takes two llvm build paths as arguments. These specify the
+#      the two llvm builds to compare. It is generally expected that they
+#      are "close cousins".  That is, they are the same except that the 
+#      second build contains some experimental optimization features that
+#      are suspected of producing a misoptimization.
+#
+#      The script takes two bytecode files, one from each build. They are
+#      presumed to be a compilation of the same program or program fragment
+#      with the only difference being the builds.
+#
+#      The script operates by iteratively applying the optimizations that gccas
+#      and gccld run until there is a difference in the assembly resulting
+#      from the optimization. The difference is then reported with the set of
+#      optimization passes that produce the difference.  The processing 
+#      continues until all optimization passes have been tried. The differences
+#      for each pass, if they do differ, are placed in a diffs.# file.
+#
+#      To work around differences in the assembly language format, the script
+#      can also take two filter arguments that post-process the assembly 
+#      so they can be differenced without making false positives for known
+#      differences in the two builds. These filters are optional.
+#
+#   Usage:
+#      findoptdiff llvm1 llvm2 bc1 bc2 filter1 filter2
+#
+#   Where:
+#      llvm1
+#          is the path to the first llvm build dir
+#      llvm2
+#          is the path to the second llvm build dir
+#      bc1
+#          is the bytecode file for the first llvm environment
+#      bc2
+#          is the bytecode file for the second llvm environment
+#      filter1
+#          is an optional filter for filtering the llvm1 generated assembly
+#      filter2
+#          is an optional filter for filtering the llvm2 generated assembly
+#       
+llvm1=$1
+llvm2=$2
+bc1=$3
+bc2=$4
+filt1=$5
+filt2=$6
+if [ -z "$filt1" ] ; then
+  filt1="cat"
+fi
+if [ -z "$filt2" ] ; then
+  filt2="cat"
+fi
+opt1="${bc1}.opt"
+opt2="${bc2}.opt" 
+ll1="${bc1}.ll"
+ll2="${bc2}.ll"
+opt1ll="${bc1}.opt.ll"
+opt2ll="${bc2}.opt.ll"
+dis1="$llvm1/Debug/bin/llvm-dis"
+dis2="$llvm2/Debug/bin/llvm-dis"
+opt1="$llvm1/Debug/bin/opt"
+opt2="$llvm2/Debug/bin/opt"
+
+all_switches="-verify -lowersetjmp -raiseallocs -simplifycfg -mem2reg -globalopt -globaldce -ipconstprop -deadargelim -instcombine -simplifycfg -prune-eh -inline -simplify-libcalls -argpromotion -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 -internalize -ipsccp -globalopt -constmerge -deadargelim -inline -prune-eh -globalopt -globaldce -argpromotion -instcombine -predsimplify -scalarrepl -globalsmodref-aa -licm -load-vn -gcse -dse -instcombine -simplifycfg -verify"
+
+#counter=0
+function tryit {
+  switches_to_use="$1"
+  $opt1 $switches_to_use "$bc1" -o - | $dis1 | $filt1 > "$opt1ll"
+  $opt2 $switches_to_use "$bc2" -o - | $dis2 | $filt2 > "$opt2ll"
+  diffs="diffs."$((counter++))
+  diff "$opt1ll" "$opt2ll" > $diffs
+  if [ $? -ne 0 ] ; then
+    echo
+    echo "Diff fails with these switches:"
+    echo $switches
+    echo "Differences:"
+    head $diffs
+    echo 'Switches:' $switches_to_use >> $diffs
+  else
+    rm $diffs
+  fi
+  return 1
+}
+
+for sw in $all_switches ; do
+  echo -n " $sw"
+  switches="$switches $sw"
+  if tryit "$switches" ; then
+    break;
+  fi
+done