When decling to reuse existing expressions that involve casts, ignore
bitcasts, which are really no-ops here. This fixes slowdowns on
MultiSource/Applications/aha and others.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@127031 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/Analysis/ScalarEvolutionExpander.cpp b/lib/Analysis/ScalarEvolutionExpander.cpp
index f2d23c4..76a94ea 100644
--- a/lib/Analysis/ScalarEvolutionExpander.cpp
+++ b/lib/Analysis/ScalarEvolutionExpander.cpp
@@ -859,7 +859,7 @@
// to be.
do {
if (IncV->getNumOperands() == 0 || isa<PHINode>(IncV) ||
- isa<CastInst>(IncV)) {
+ (isa<CastInst>(IncV) && !isa<BitCastInst>(IncV))) {
IncV = 0;
break;
}