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| author | Bill Wendling <isanbard@gmail.com> | 2013-11-25 05:20:10 +0000 |
|---|---|---|
| committer | Bill Wendling <isanbard@gmail.com> | 2013-11-25 05:20:10 +0000 |
| commit | 16f81f783207fa359f3afc589e2135d4805c9b98 (patch) | |
| tree | 84c10709744a95cf41b303825d43b8e526363ef7 /lib | |
| parent | 9add5c2d4b282f7cae583ece5cea3f83d33c488b (diff) | |
| download | external_llvm-16f81f783207fa359f3afc589e2135d4805c9b98.zip external_llvm-16f81f783207fa359f3afc589e2135d4805c9b98.tar.gz external_llvm-16f81f783207fa359f3afc589e2135d4805c9b98.tar.bz2 | |
Merging r195476:
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r195476 | hliao | 2013-11-22 09:56:57 -0800 (Fri, 22 Nov 2013) | 6 lines
Fix PR18014
- When simplifying the mask generation for BLEND, check whether that mask is
also consumed by other non-BLEND insns. If true, skip that simplification.
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git-svn-id: https://llvm.org/svn/llvm-project/llvm/branches/release_34@195602 91177308-0d34-0410-b5e6-96231b3b80d8
Diffstat (limited to 'lib')
| -rw-r--r-- | lib/Target/X86/X86ISelLowering.cpp | 9 |
1 files changed, 9 insertions, 0 deletions
diff --git a/lib/Target/X86/X86ISelLowering.cpp b/lib/Target/X86/X86ISelLowering.cpp index 9df0232..627aa86 100644 --- a/lib/Target/X86/X86ISelLowering.cpp +++ b/lib/Target/X86/X86ISelLowering.cpp @@ -17007,6 +17007,15 @@ static SDValue PerformSELECTCombine(SDNode *N, SelectionDAG &DAG, if (BitWidth == 1) return SDValue(); + // Check all uses of that condition operand to check whether it will be + // consumed by non-BLEND instructions, which may depend on all bits are set + // properly. + for (SDNode::use_iterator I = Cond->use_begin(), + E = Cond->use_end(); I != E; ++I) + if (I->getOpcode() != ISD::VSELECT) + // TODO: Add other opcodes eventually lowered into BLEND. + return SDValue(); + assert(BitWidth >= 8 && BitWidth <= 64 && "Invalid mask size"); APInt DemandedMask = APInt::getHighBitsSet(BitWidth, 1); |