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| author | Dan Gohman <gohman@apple.com> | 2009-06-21 23:46:38 +0000 |
|---|---|---|
| committer | Dan Gohman <gohman@apple.com> | 2009-06-21 23:46:38 +0000 |
| commit | 51f53b7f5a0e859ceef995c61667905166b96f1b (patch) | |
| tree | d9190de286f8fd9ad559821d01fc525efee93146 /test/Transforms/IndVarSimplify/loop_evaluate_6.ll | |
| parent | 14ee48a5bae352780b767a14bd97e8e91800a95b (diff) | |
| download | external_llvm-51f53b7f5a0e859ceef995c61667905166b96f1b.zip external_llvm-51f53b7f5a0e859ceef995c61667905166b96f1b.tar.gz external_llvm-51f53b7f5a0e859ceef995c61667905166b96f1b.tar.bz2 | |
Fix ScalarEvolution's backedge-taken count computations to check for
overflow when computing a integer division to round up.
Thanks to Nick Lewycky for noticing this!
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@73862 91177308-0d34-0410-b5e6-96231b3b80d8
Diffstat (limited to 'test/Transforms/IndVarSimplify/loop_evaluate_6.ll')
| -rw-r--r-- | test/Transforms/IndVarSimplify/loop_evaluate_6.ll | 6 |
1 files changed, 4 insertions, 2 deletions
diff --git a/test/Transforms/IndVarSimplify/loop_evaluate_6.ll b/test/Transforms/IndVarSimplify/loop_evaluate_6.ll index 35fbf52..0d17a80 100644 --- a/test/Transforms/IndVarSimplify/loop_evaluate_6.ll +++ b/test/Transforms/IndVarSimplify/loop_evaluate_6.ll @@ -1,7 +1,9 @@ ; RUN: llvm-as < %s | opt -indvars -loop-deletion | llvm-dis | grep phi | count 1 +; XFAIL: * -; Indvars should be able to evaluate this loop, allowing loop deletion -; to delete it. +; Indvars can't evaluate this loop, because ScalarEvolution can't compute +; an exact trip count, because it doesn't know if dividing by the stride will +; have a remainder. It could be done with more aggressive VRP though. define i32 @test(i32 %x_offs) nounwind readnone { entry: |