diff options
| author | Hans Wennborg <hans@hanshq.net> | 2017-08-22 16:17:32 +0000 |
|---|---|---|
| committer | Hans Wennborg <hans@hanshq.net> | 2017-08-22 16:17:32 +0000 |
| commit | eb7354c3b1163ff060c181ff3b49d4a7a24efe5b (patch) | |
| tree | 0ba0b64b95ea0b4a9f389f9ef2bbdf659aca2ca7 /include | |
| parent | 37c9f925e3be4d3e957f273208e6af9e5c3fa3e5 (diff) | |
Merging r311429:
------------------------------------------------------------------------
r311429 | ctopper | 2017-08-21 22:40:17 -0700 (Mon, 21 Aug 2017) | 9 lines
[X86] Prevent several calls to ISD::isConstantSplatVector from returning a narrower APInt than the original scalar type
ISD::isConstantSplatVector can shrink to the smallest splat width. But we don't check the size of the resulting APInt at all. This can cause us to misinterpret the results.
This patch just adds a flag to prevent the APInt from changing width.
Fixes PR34271.
Differential Revision: https://reviews.llvm.org/D36996
------------------------------------------------------------------------
git-svn-id: https://llvm.org/svn/llvm-project/llvm/branches/release_50@311462 91177308-0d34-0410-b5e6-96231b3b80d8
Diffstat (limited to 'include')
| -rw-r--r-- | include/llvm/CodeGen/SelectionDAGNodes.h | 5 |
1 files changed, 4 insertions, 1 deletions
diff --git a/include/llvm/CodeGen/SelectionDAGNodes.h b/include/llvm/CodeGen/SelectionDAGNodes.h index db42fb6c170c..051c93601d3f 100644 --- a/include/llvm/CodeGen/SelectionDAGNodes.h +++ b/include/llvm/CodeGen/SelectionDAGNodes.h @@ -85,7 +85,10 @@ namespace ISD { /// If N is a BUILD_VECTOR node whose elements are all the same constant or /// undefined, return true and return the constant value in \p SplatValue. - bool isConstantSplatVector(const SDNode *N, APInt &SplatValue); + /// This sets \p SplatValue to the smallest possible splat unless AllowShrink + /// is set to false. + bool isConstantSplatVector(const SDNode *N, APInt &SplatValue, + bool AllowShrink = true); /// Return true if the specified node is a BUILD_VECTOR where all of the /// elements are ~0 or undef. |