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| author | Hal Finkel <hfinkel@anl.gov> | 2012-10-24 19:46:44 +0000 |
|---|---|---|
| committer | Hal Finkel <hfinkel@anl.gov> | 2012-10-24 19:46:44 +0000 |
| commit | 8c65549318950ff3fc1cb3d7a73fb50c688c78a5 (patch) | |
| tree | fd174875c34cec9db5e130538cb2e7ee02e40283 /test | |
| parent | 99abc17832b36007c66369321c0c2f5a2a7713f1 (diff) | |
| download | llvm-8c65549318950ff3fc1cb3d7a73fb50c688c78a5.tar.gz llvm-8c65549318950ff3fc1cb3d7a73fb50c688c78a5.tar.bz2 llvm-8c65549318950ff3fc1cb3d7a73fb50c688c78a5.tar.xz | |
getSmallConstantTripMultiple should never return zero.
When the trip count is -1, getSmallConstantTripMultiple could return zero,
and this would cause runtime loop unrolling to assert. Instead of returning
zero, one is now returned (consistent with the existing overflow cases).
Fixes PR14167.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@166612 91177308-0d34-0410-b5e6-96231b3b80d8
Diffstat (limited to 'test')
| -rw-r--r-- | test/Transforms/LoopUnroll/pr14167.ll | 44 |
1 files changed, 44 insertions, 0 deletions
diff --git a/test/Transforms/LoopUnroll/pr14167.ll b/test/Transforms/LoopUnroll/pr14167.ll new file mode 100644 index 0000000000..205ae44b72 --- /dev/null +++ b/test/Transforms/LoopUnroll/pr14167.ll @@ -0,0 +1,44 @@ +; RUN: opt < %s -S -loop-unroll -unroll-runtime | FileCheck %s +target datalayout = "E-p:64:64:64-i1:8:8-i8:8:8-i16:16:16-i32:32:32-i64:64:64-f32:32:32-f64:64:64-v128:128:128-n32:64" +target triple = "powerpc64-bgq-linux" + +define void @test1() nounwind { +; Ensure that we don't crash when the trip count == -1. +; CHECK: @test1 +entry: + br label %for.cond2.preheader + +for.cond2.preheader: ; preds = %for.end, %entry + br i1 false, label %middle.block, label %vector.ph + +vector.ph: ; preds = %for.cond2.preheader + br label %vector.body + +vector.body: ; preds = %vector.body, %vector.ph + br i1 undef, label %middle.block.loopexit, label %vector.body + +middle.block.loopexit: ; preds = %vector.body + br label %middle.block + +middle.block: ; preds = %middle.block.loopexit, %for.cond2.preheader + br i1 true, label %for.end, label %scalar.preheader + +scalar.preheader: ; preds = %middle.block + br label %for.body4 + +for.body4: ; preds = %for.body4, %scalar.preheader + %indvars.iv = phi i64 [ 16000, %scalar.preheader ], [ %indvars.iv.next, %for.body4 ] + %indvars.iv.next = add i64 %indvars.iv, 1 + %lftr.wideiv = trunc i64 %indvars.iv.next to i32 + %exitcond = icmp ne i32 %lftr.wideiv, 16000 + br i1 %exitcond, label %for.body4, label %for.end.loopexit + +for.end.loopexit: ; preds = %for.body4 + br label %for.end + +for.end: ; preds = %for.end.loopexit, %middle.block + br i1 undef, label %for.cond2.preheader, label %for.end15 + +for.end15: ; preds = %for.end + ret void +} |