diff options
Diffstat (limited to 'lib')
| -rw-r--r-- | lib/Target/X86/X86ISelLowering.cpp | 17 |
1 files changed, 8 insertions, 9 deletions
diff --git a/lib/Target/X86/X86ISelLowering.cpp b/lib/Target/X86/X86ISelLowering.cpp index d56e672e1f..33eee7a736 100644 --- a/lib/Target/X86/X86ISelLowering.cpp +++ b/lib/Target/X86/X86ISelLowering.cpp @@ -5382,13 +5382,19 @@ SDValue X86TargetLowering::EmitTest(SDValue Op, SelectionDAG &DAG) { UE = Op.getNode()->use_end(); UI != UE; ++UI) if (UI->getOpcode() == ISD::STORE) goto default_case; - // An add of one will be selected as an INC. if (ConstantSDNode *C = - dyn_cast<ConstantSDNode>(Op.getNode()->getOperand(1))) + dyn_cast<ConstantSDNode>(Op.getNode()->getOperand(1))) { + // An add of one will be selected as an INC. if (C->getAPIntValue() == 1) { Opcode = X86ISD::INC; break; } + // An add of negative one (subtract of one) will be selected as a DEC. + if (C->getAPIntValue().isAllOnesValue()) { + Opcode = X86ISD::DEC; + break; + } + } // Otherwise use a regular EFLAGS-setting add. Opcode = X86ISD::ADD; break; @@ -5399,13 +5405,6 @@ SDValue X86TargetLowering::EmitTest(SDValue Op, SelectionDAG &DAG) { UE = Op.getNode()->use_end(); UI != UE; ++UI) if (UI->getOpcode() == ISD::STORE) goto default_case; - // A subtract of one will be selected as a DEC. - if (ConstantSDNode *C = - dyn_cast<ConstantSDNode>(Op.getNode()->getOperand(1))) - if (C->getAPIntValue() == 1) { - Opcode = X86ISD::DEC; - break; - } // Otherwise use a regular EFLAGS-setting sub. Opcode = X86ISD::SUB; break; |