[llvm-commits] CVS: llvm/lib/Target/TargetLowering.cpp

[Chris Lattner]

Changes in directory llvm/lib/Target:

TargetLowering.cpp updated: 1.25 -> 1.26
---
Log message:

Implement MaskedValueIsZero for ANY_EXTEND nodes


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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.