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r107852 is only safe with -enable-unsafe-fp-math to account for +0.0 == -0.0.

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@107856 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Evan Cheng 2010-07-08 06:01:49 +00:00
parent 3651d92d91
commit 4ff7ab612c
2 changed files with 6 additions and 4 deletions
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8
lib/Target/ARM/ARMISelLowering.cpp
View File

@ -2295,11 +2295,13 @@ SDValue
ARMTargetLowering::getVFPCmp(SDValue &LHS, SDValue &RHS, ISD::CondCode CC,
SDValue &ARMCC, SelectionDAG &DAG,
DebugLoc dl) const {
if ((CC == ISD::SETEQ || CC == ISD::SETOEQ ||
if (UnsafeFPMath &&
(CC == ISD::SETEQ || CC == ISD::SETOEQ ||
CC == ISD::SETNE || CC == ISD::SETUNE) &&
canBitcastToInt(LHS.getNode()) && canBitcastToInt(RHS.getNode())) {
// If there are no othter uses of the CMP operands, and the condition
// code is EQ oe NE, we can optimize it to an integer comparison.
// If unsafe fp math optimization is enabled and there are no othter uses of
// the CMP operands, and the condition code is EQ oe NE, we can optimize it
// to an integer comparison.
if (CC == ISD::SETOEQ)
CC = ISD::SETEQ;
else if (CC == ISD::SETUNE)

2
test/CodeGen/ARM/fpcmp-opt.ll
View File

@ -1,4 +1,4 @@
; RUN: llc < %s -march=arm -mattr=+vfp2 | FileCheck %s
; RUN: llc < %s -march=arm -mattr=+vfp2 -enable-unsafe-fp-math | FileCheck %s
; rdar://7461510
define arm_apcscc i32 @t1(float* %a, float* %b) nounwind {