Check iteration count.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@55680 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/Transforms/Scalar/LoopStrengthReduce.cpp b/lib/Transforms/Scalar/LoopStrengthReduce.cpp
index b2c5977..16b8dbb 100644
--- a/lib/Transforms/Scalar/LoopStrengthReduce.cpp
+++ b/lib/Transforms/Scalar/LoopStrengthReduce.cpp
@@ -1908,6 +1908,10 @@
/// 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/test/Transforms/LoopStrengthReduce/2008-09-02-IVType.ll b/test/Transforms/LoopStrengthReduce/2008-09-02-IVType.ll
index 772d9dd..49df675 100644
--- a/test/Transforms/LoopStrengthReduce/2008-09-02-IVType.ll
+++ b/test/Transforms/LoopStrengthReduce/2008-09-02-IVType.ll
@@ -49,7 +49,7 @@
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