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Fix a fixme in CondPropagate.cpp by moving a PhiNode optimization into

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BasicBlock's removePredecessor routine.  This requires shuffling around
the definition and implementation of hasContantValue from Utils.h,cpp into
Instructions.h,cpp


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@22664 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Nate Begeman
2005-08-04 23:24:19 +00:00
parent f065f05397
commit a83ba0f5c9
9 changed files with 48 additions and 62 deletions
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5
lib/Transforms/Utils/LoopSimplify.cpp
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@ -41,7 +41,6 @@
#include "llvm/Analysis/Dominators.h"
#include "llvm/Analysis/LoopInfo.h"
#include "llvm/Support/CFG.h"
#include "llvm/Transforms/Utils/Local.h"
#include "llvm/ADT/SetOperations.h"
#include "llvm/ADT/SetVector.h"
#include "llvm/ADT/Statistic.h"
@ -257,7 +256,7 @@ BasicBlock *LoopSimplify::SplitBlockPredecessors(BasicBlock *BB,
PN->addIncoming(InVal, NewBB);
// Can we eliminate this phi node now?
if (Value *V = hasConstantValue(PN)) {
if (Value *V = PN->hasConstantValue()) {
if (!isa<Instruction>(V) ||
getAnalysis<DominatorSet>().dominates(cast<Instruction>(V), PN)) {
PN->replaceAllUsesWith(V);
@ -443,7 +442,7 @@ static PHINode *FindPHIToPartitionLoops(Loop *L, DominatorSet &DS,
for (BasicBlock::iterator I = L->getHeader()->begin(); isa<PHINode>(I); ) {
PHINode *PN = cast<PHINode>(I);
++I;
if (Value *V = hasConstantValue(PN))
if (Value *V = PN->hasConstantValue())
if (!isa<Instruction>(V) || DS.dominates(cast<Instruction>(V), PN)) {
// This is a degenerate PHI already, don't modify it!
PN->replaceAllUsesWith(V);