diff options
Diffstat (limited to 'lib/Target')
| -rw-r--r-- | lib/Target/X86/X86ISelLowering.cpp | 16 |
1 files changed, 14 insertions, 2 deletions
diff --git a/lib/Target/X86/X86ISelLowering.cpp b/lib/Target/X86/X86ISelLowering.cpp index 4d5b4da..409c39b 100644 --- a/lib/Target/X86/X86ISelLowering.cpp +++ b/lib/Target/X86/X86ISelLowering.cpp @@ -1724,12 +1724,14 @@ bool X86::isMOVSHDUPMask(SDNode *N) { return false; // Expect 1, 1, 3, 3 + unsigned NumNodes = 0; for (unsigned i = 0; i < 2; ++i) { SDOperand Arg = N->getOperand(i); if (Arg.getOpcode() == ISD::UNDEF) continue; assert(isa<ConstantSDNode>(Arg) && "Invalid VECTOR_SHUFFLE mask!"); unsigned Val = cast<ConstantSDNode>(Arg)->getValue(); if (Val != 1) return false; + NumNodes++; } for (unsigned i = 2; i < 4; ++i) { SDOperand Arg = N->getOperand(i); @@ -1737,8 +1739,12 @@ bool X86::isMOVSHDUPMask(SDNode *N) { assert(isa<ConstantSDNode>(Arg) && "Invalid VECTOR_SHUFFLE mask!"); unsigned Val = cast<ConstantSDNode>(Arg)->getValue(); if (Val != 3) return false; + NumNodes++; } - return true; + + // Don't use movshdup if the resulting vector contains only one undef node. + // Use {p}shuf* instead. + return NumNodes > 1; } /// isMOVSLDUPMask - Return true if the specified VECTOR_SHUFFLE operand @@ -1750,12 +1756,14 @@ bool X86::isMOVSLDUPMask(SDNode *N) { return false; // Expect 0, 0, 2, 2 + unsigned NumNodes = 0; for (unsigned i = 0; i < 2; ++i) { SDOperand Arg = N->getOperand(i); if (Arg.getOpcode() == ISD::UNDEF) continue; assert(isa<ConstantSDNode>(Arg) && "Invalid VECTOR_SHUFFLE mask!"); unsigned Val = cast<ConstantSDNode>(Arg)->getValue(); if (Val != 0) return false; + NumNodes++; } for (unsigned i = 2; i < 4; ++i) { SDOperand Arg = N->getOperand(i); @@ -1763,8 +1771,12 @@ bool X86::isMOVSLDUPMask(SDNode *N) { assert(isa<ConstantSDNode>(Arg) && "Invalid VECTOR_SHUFFLE mask!"); unsigned Val = cast<ConstantSDNode>(Arg)->getValue(); if (Val != 2) return false; + NumNodes++; } - return true; + + // Don't use movsldup if the resulting vector contains only one undef node. + // Use {p}shuf* instead. + return NumNodes > 1; } /// isSplatMask - Return true if the specified VECTOR_SHUFFLE operand specifies |