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Check iteration count. 

llvm-svn: 55680
This commit is contained in:
Devang Patel 2008-09-03 00:10:56 +00:00
parent 24422d4928
commit b530f08122
2 changed files with 5 additions and 1 deletions
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4
llvm/lib/Transforms/Scalar/LoopStrengthReduce.cpp
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@ -1908,6 +1908,10 @@ BinaryOperator *getNewPHIIncrement(BinaryOperator *Incr, PHINode *PHI,
/// change the type of IV, if possible.
void LoopStrengthReduce::OptimizeIVType(Loop *L) {
SCEVHandle IterationCount = SE->getIterationCount(L);
if (isa<SCEVCouldNotCompute>(IterationCount))
return;
BasicBlock *LPH = L->getLoopPreheader();
BasicBlock *LatchBB = L->getLoopLatch();
SmallVector<PHINode *, 4> PHIs;

2
llvm/test/Transforms/LoopStrengthReduce/2008-09-02-IVType.ll
View File

@ -49,7 +49,7 @@ bb28: ; preds = %bb8, %bb
store i16* %theDCTBufferIter.0.lcssa, i16** %tmp6, align 4
%tmp37 = add i16 %component.09, 1 ; <i16> [#uses=2]
%phitmp15 = sext i16 %tmp37 to i32 ; <i32> [#uses=1]
%tmp46 = icmp slt i32 %phitmp15, %tmp4412 ; <i1> [#uses=1]
%tmp46 = icmp slt i32 %phitmp15, 42 ; <i1> [#uses=1]
br i1 %tmp46, label %bb, label %bb49
bb49: ; preds = %bb28, %entry