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SCEVExpander: Fold constant PHIs harder. The logic below only understands proper IVs.

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PR20093.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@211433 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Benjamin Kramer
2014-06-21 11:47:18 +00:00
parent 7921239c41
commit b7f1fb47e6
2 changed files with 53 additions and 1 deletions
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3
lib/Analysis/ScalarEvolutionExpander.cpp
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@ -16,6 +16,7 @@
#include "llvm/Analysis/ScalarEvolutionExpander.h"
#include "llvm/ADT/STLExtras.h"
#include "llvm/ADT/SmallSet.h"
#include "llvm/Analysis/InstructionSimplify.h"
#include "llvm/Analysis/LoopInfo.h"
#include "llvm/Analysis/TargetTransformInfo.h"
#include "llvm/IR/DataLayout.h"
@ -1706,7 +1707,7 @@ unsigned SCEVExpander::replaceCongruentIVs(Loop *L, const DominatorTree *DT,
// Fold constant phis. They may be congruent to other constant phis and
// would confuse the logic below that expects proper IVs.
if (Value *V = Phi->hasConstantValue()) {
if (Value *V = SimplifyInstruction(Phi, SE.DL, SE.TLI, SE.DT)) {
Phi->replaceAllUsesWith(V);
DeadInsts.push_back(Phi);
++NumElim;