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| author | Chris Lattner <sabre@nondot.org> | 2006-02-02 06:43:15 +0000 |
|---|---|---|
| committer | Chris Lattner <sabre@nondot.org> | 2006-02-02 06:43:15 +0000 |
| commit | e0c60d63b167b3171054ec80da3bd1c75f8743b7 (patch) | |
| tree | 1f38fb2903409ae8b10e7d33d02eeb0d94393eb6 /llvm/lib | |
| parent | 4b2ec8af23bb5b782b7d14035279737358e3d56f (diff) | |
| download | bcm5719-llvm-e0c60d63b167b3171054ec80da3bd1c75f8743b7.tar.gz bcm5719-llvm-e0c60d63b167b3171054ec80da3bd1c75f8743b7.zip | |
Implement MaskedValueIsZero for ANY_EXTEND nodes
llvm-svn: 25900
Diffstat (limited to 'llvm/lib')
| -rw-r--r-- | llvm/lib/Target/TargetLowering.cpp | 5 |
1 files changed, 5 insertions, 0 deletions
diff --git a/llvm/lib/Target/TargetLowering.cpp b/llvm/lib/Target/TargetLowering.cpp index c861762d16d..c79045b8859 100644 --- a/llvm/lib/Target/TargetLowering.cpp +++ b/llvm/lib/Target/TargetLowering.cpp @@ -154,6 +154,11 @@ bool TargetLowering::MaskedValueIsZero(const SDOperand &Op, case ISD::ZERO_EXTEND: SrcBits = MVT::getSizeInBits(Op.getOperand(0).getValueType()); return MaskedValueIsZero(Op.getOperand(0),Mask & (~0ULL >> (64-SrcBits))); + case ISD::ANY_EXTEND: + // If the mask only includes bits in the low part, recurse. + SrcBits = MVT::getSizeInBits(Op.getOperand(0).getValueType()); + if (Mask >> SrcBits) return false; // Use of unknown top bits. + return MaskedValueIsZero(Op.getOperand(0), Mask); case ISD::AssertZext: SrcBits = MVT::getSizeInBits(cast<VTSDNode>(Op.getOperand(1))->getVT()); return (Mask & ((1ULL << SrcBits)-1)) == 0; // Returning only the zext bits. |
