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| author | Devang Patel <dpatel@apple.com> | 2008-09-03 00:10:56 +0000 |
|---|---|---|
| committer | Devang Patel <dpatel@apple.com> | 2008-09-03 00:10:56 +0000 |
| commit | b530f0812222f25395a841d145cdae785844f52f (patch) | |
| tree | 36106506fa56cc126137091cda1a793dc5b69b01 | |
| parent | 24422d4928e72426c34ab7dca79413310782d335 (diff) | |
| download | bcm5719-llvm-b530f0812222f25395a841d145cdae785844f52f.tar.gz bcm5719-llvm-b530f0812222f25395a841d145cdae785844f52f.zip | |
Check iteration count.
llvm-svn: 55680
| -rw-r--r-- | llvm/lib/Transforms/Scalar/LoopStrengthReduce.cpp | 4 | ||||
| -rw-r--r-- | llvm/test/Transforms/LoopStrengthReduce/2008-09-02-IVType.ll | 2 |
2 files changed, 5 insertions, 1 deletions
diff --git a/llvm/lib/Transforms/Scalar/LoopStrengthReduce.cpp b/llvm/lib/Transforms/Scalar/LoopStrengthReduce.cpp index b2c5977a1b6..16b8dbb451f 100644 --- a/llvm/lib/Transforms/Scalar/LoopStrengthReduce.cpp +++ b/llvm/lib/Transforms/Scalar/LoopStrengthReduce.cpp @@ -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; diff --git a/llvm/test/Transforms/LoopStrengthReduce/2008-09-02-IVType.ll b/llvm/test/Transforms/LoopStrengthReduce/2008-09-02-IVType.ll index 772d9dda0f5..49df675e588 100644 --- a/llvm/test/Transforms/LoopStrengthReduce/2008-09-02-IVType.ll +++ b/llvm/test/Transforms/LoopStrengthReduce/2008-09-02-IVType.ll @@ -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 |
