diff options
| -rw-r--r-- | lib/Target/X86/X86ISelPattern.cpp | 49 |
1 files changed, 47 insertions, 2 deletions
diff --git a/lib/Target/X86/X86ISelPattern.cpp b/lib/Target/X86/X86ISelPattern.cpp index f5f6c10561..dacd5133c1 100644 --- a/lib/Target/X86/X86ISelPattern.cpp +++ b/lib/Target/X86/X86ISelPattern.cpp @@ -857,6 +857,22 @@ void ISel::EmitCMP(SDOperand LHS, SDOperand RHS) { unsigned Opc; if (ConstantSDNode *CN = dyn_cast<ConstantSDNode>(RHS)) { Opc = 0; + if (isFoldableLoad(LHS)) { + switch (RHS.getValueType()) { + default: break; + case MVT::i1: + case MVT::i8: Opc = X86::CMP8mi; break; + case MVT::i16: Opc = X86::CMP16mi; break; + case MVT::i32: Opc = X86::CMP32mi; break; + } + if (Opc) { + X86AddressMode AM; + EmitFoldedLoad(LHS, AM); + addFullAddress(BuildMI(BB, Opc, 5), AM).addImm(CN->getValue()); + return; + } + } + switch (RHS.getValueType()) { default: break; case MVT::i1: @@ -871,6 +887,30 @@ void ISel::EmitCMP(SDOperand LHS, SDOperand RHS) { } } + Opc = 0; + if (isFoldableLoad(LHS)) { + switch (RHS.getValueType()) { + default: break; + case MVT::i1: + case MVT::i8: Opc = X86::CMP8mr; break; + case MVT::i16: Opc = X86::CMP16mr; break; + case MVT::i32: Opc = X86::CMP32mr; break; + } + if (Opc) { + X86AddressMode AM; + unsigned Reg; + if (getRegPressure(LHS) > getRegPressure(RHS)) { + EmitFoldedLoad(LHS, AM); + Reg = SelectExpr(RHS); + } else { + Reg = SelectExpr(RHS); + EmitFoldedLoad(LHS, AM); + } + addFullAddress(BuildMI(BB, Opc, 5), AM).addReg(Reg); + return; + } + } + switch (LHS.getValueType()) { default: assert(0 && "Cannot compare this value!"); case MVT::i1: @@ -1986,8 +2026,13 @@ void ISel::Select(SDOperand N) { assert(0 && "Node not handled yet!"); case ISD::EntryToken: return; // Noop case ISD::CopyToReg: - Select(N.getOperand(0)); - Tmp1 = SelectExpr(N.getOperand(1)); + if (getRegPressure(N.getOperand(0)) > getRegPressure(N.getOperand(1))) { + Select(N.getOperand(0)); + Tmp1 = SelectExpr(N.getOperand(1)); + } else { + Tmp1 = SelectExpr(N.getOperand(1)); + Select(N.getOperand(0)); + } Tmp2 = cast<CopyRegSDNode>(N)->getReg(); if (Tmp1 != Tmp2) { |