Changes in directory llvm/lib/Target:
TargetLowering.cpp updated: 1.25 -> 1.26
---
Log message:
Implement MaskedValueIsZero for ANY_EXTEND nodes
---
Diffs of the changes: (+5 -0)
TargetLowering.cpp | 5 +++++
1 files changed, 5 insertions(+)
Index: llvm/lib/Target/TargetLowering.cpp
diff -u llvm/lib/Target/TargetLowering.cpp:1.25
llvm/lib/Target/TargetLowering.cpp:1.26
--- llvm/lib/Target/TargetLowering.cpp:1.25 Tue Jan 31 19:29:22 2006
+++ llvm/lib/Target/TargetLowering.cpp Thu Feb 2 00:43:15 2006
@@ -154,6 +154,11 @@
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.
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