diff options
| author | Evan Cheng <evan.cheng@apple.com> | 2009-02-02 09:15:04 +0000 |
|---|---|---|
| committer | Evan Cheng <evan.cheng@apple.com> | 2009-02-02 09:15:04 +0000 |
| commit | dc636c4080bfe77b1377ba7fe8b3b98c87676d87 (patch) | |
| tree | 9408291fb5a935a7fe49236d8199efcab9391ea8 /llvm/lib | |
| parent | 7e4cb0a1cf0f2add6de6748825d9267a97feae5b (diff) | |
| download | bcm5719-llvm-dc636c4080bfe77b1377ba7fe8b3b98c87676d87.tar.gz bcm5719-llvm-dc636c4080bfe77b1377ba7fe8b3b98c87676d87.zip | |
ADD / SUB / SMUL / UMUL with overflow second result top bits must be zero.
llvm-svn: 63509
Diffstat (limited to 'llvm/lib')
| -rw-r--r-- | llvm/lib/Target/X86/X86ISelLowering.cpp | 8 |
1 files changed, 8 insertions, 0 deletions
diff --git a/llvm/lib/Target/X86/X86ISelLowering.cpp b/llvm/lib/Target/X86/X86ISelLowering.cpp index 846acd02197..7a4d34d10a4 100644 --- a/llvm/lib/Target/X86/X86ISelLowering.cpp +++ b/llvm/lib/Target/X86/X86ISelLowering.cpp @@ -7515,6 +7515,14 @@ void X86TargetLowering::computeMaskedBitsForTargetNode(const SDValue Op, KnownZero = KnownOne = APInt(Mask.getBitWidth(), 0); // Don't know anything. switch (Opc) { default: break; + case X86ISD::ADD: + case X86ISD::SUB: + case X86ISD::SMUL: + case X86ISD::UMUL: + // These nodes' second result is a boolean. + if (Op.getResNo() == 0) + break; + // Fallthrough case X86ISD::SETCC: KnownZero |= APInt::getHighBitsSet(Mask.getBitWidth(), Mask.getBitWidth() - 1); |
