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| author | Pawel Bylica <chfast@gmail.com> | 2015-05-06 10:19:14 +0000 |
|---|---|---|
| committer | Pawel Bylica <chfast@gmail.com> | 2015-05-06 10:19:14 +0000 |
| commit | 9f1fb9d1ef5ad150cb1bcb0c441c8774b25fd285 (patch) | |
| tree | 77c4f2b1ebab6eeea6e63cb37dc800581824ba1a /llvm/lib/CodeGen | |
| parent | e71ed1984188faa93e9409d91c21dc721dfdf162 (diff) | |
| download | bcm5719-llvm-9f1fb9d1ef5ad150cb1bcb0c441c8774b25fd285.tar.gz bcm5719-llvm-9f1fb9d1ef5ad150cb1bcb0c441c8774b25fd285.zip | |
SelectionDAG: Handle out-of-bounds index in extract vector element
Summary: This patch correctly handles undef case of EXTRACT_VECTOR_ELT node where the element index is constant and not less than vector size.
Test Plan:
CodeGen for X86 test included.
Also one incorrect regression test fixed.
Reviewers: qcolombet, chandlerc, hfinkel
Reviewed By: hfinkel
Subscribers: hfinkel, llvm-commits
Differential Revision: http://reviews.llvm.org/D9250
llvm-svn: 236584
Diffstat (limited to 'llvm/lib/CodeGen')
| -rw-r--r-- | llvm/lib/CodeGen/SelectionDAG/SelectionDAG.cpp | 4 |
1 files changed, 4 insertions, 0 deletions
diff --git a/llvm/lib/CodeGen/SelectionDAG/SelectionDAG.cpp b/llvm/lib/CodeGen/SelectionDAG/SelectionDAG.cpp index 3b22e9715d1..d9a85369324 100644 --- a/llvm/lib/CodeGen/SelectionDAG/SelectionDAG.cpp +++ b/llvm/lib/CodeGen/SelectionDAG/SelectionDAG.cpp @@ -3408,6 +3408,10 @@ SDValue SelectionDAG::getNode(unsigned Opcode, SDLoc DL, EVT VT, SDValue N1, if (N1.getOpcode() == ISD::UNDEF) return getUNDEF(VT); + // EXTRACT_VECTOR_ELT of out-of-bounds element is an UNDEF + if (N2C && N2C->getZExtValue() >= N1.getValueType().getVectorNumElements()) + return getUNDEF(VT); + // EXTRACT_VECTOR_ELT of CONCAT_VECTORS is often formed while lowering is // expanding copies of large vectors from registers. if (N2C && |
