From 1722f061a3e7c2f6ef8be9f2f0f7c81ab763c7be Mon Sep 17 00:00:00 2001 From: Anton Korobeynikov Date: Sun, 22 Nov 2009 01:14:08 +0000 Subject: [PATCH] Minor optimization: when doing eq/ne comparions and RHS is a constant - swap operands, this will allow us to fold imm into comparison. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@89574 91177308-0d34-0410-b5e6-96231b3b80d8 --- lib/Target/MSP430/MSP430ISelLowering.cpp | 8 ++++++++ 1 file changed, 8 insertions(+) diff --git a/lib/Target/MSP430/MSP430ISelLowering.cpp b/lib/Target/MSP430/MSP430ISelLowering.cpp index adc6d58961e..29cc370bef9 100644 --- a/lib/Target/MSP430/MSP430ISelLowering.cpp +++ b/lib/Target/MSP430/MSP430ISelLowering.cpp @@ -594,9 +594,17 @@ static SDValue EmitCMP(SDValue &LHS, SDValue &RHS, SDValue &TargetCC, default: llvm_unreachable("Invalid integer condition!"); case ISD::SETEQ: TCC = MSP430CC::COND_E; // aka COND_Z + // Minor optimization: if RHS is a constant, swap operands, then the + // constant can be folded into comparison. + if (RHS.getOpcode() == ISD::Constant) + std::swap(LHS, RHS); break; case ISD::SETNE: TCC = MSP430CC::COND_NE; // aka COND_NZ + // Minor optimization: if RHS is a constant, swap operands, then the + // constant can be folded into comparison. + if (RHS.getOpcode() == ISD::Constant) + std::swap(LHS, RHS); break; case ISD::SETULE: std::swap(LHS, RHS); // FALLTHROUGH -- 2.34.1