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Omit unnecessary stack copy when x87 input is a load.

Browse Source 
rdar://problem/6373334


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@132458 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Stuart Hastings 2011-06-02 15:57:11 +00:00
parent 19e1f633af
commit 84be958ed8
2 changed files with 32 additions and 6 deletions
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23
lib/Target/X86/X86ISelLowering.cpp
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@ -6700,6 +6700,11 @@ SDValue X86TargetLowering::LowerSINT_TO_FP(SDValue Op,
DebugLoc dl = Op.getDebugLoc();
unsigned Size = SrcVT.getSizeInBits()/8;
MachineFunction &MF = DAG.getMachineFunction();
SDValue Addr = Op.getOperand(0);
if (Addr.getOpcode() == ISD::LOAD)
return BuildFILD(Op, SrcVT, DAG.getEntryNode(), Addr, DAG);
int SSFI = MF.getFrameInfo()->CreateStackObject(Size, Size, false);
SDValue StackSlot = DAG.getFrameIndex(SSFI, getPointerTy());
SDValue Chain = DAG.getStore(DAG.getEntryNode(), dl, Op.getOperand(0),
@ -6723,12 +6728,18 @@ SDValue X86TargetLowering::BuildFILD(SDValue Op, EVT SrcVT, SDValue Chain,
unsigned ByteSize = SrcVT.getSizeInBits()/8;
int SSFI = cast<FrameIndexSDNode>(StackSlot)->getIndex();
MachineMemOperand *MMO =
DAG.getMachineFunction()
.getMachineMemOperand(MachinePointerInfo::getFixedStack(SSFI),
MachineMemOperand::MOLoad, ByteSize, ByteSize);
FrameIndexSDNode *FI = dyn_cast<FrameIndexSDNode>(StackSlot);
MachineMemOperand *MMO;
if (FI) {
int SSFI = FI->getIndex();
MMO =
DAG.getMachineFunction()
.getMachineMemOperand(MachinePointerInfo::getFixedStack(SSFI),
MachineMemOperand::MOLoad, ByteSize, ByteSize);
} else {
MMO = cast<LoadSDNode>(StackSlot)->getMemOperand();
StackSlot = StackSlot.getOperand(1);
}
SDValue Ops[] = { Chain, StackSlot, DAG.getValueType(SrcVT) };
SDValue Result = DAG.getMemIntrinsicNode(useSSE ? X86ISD::FILD_FLAG :
X86ISD::FILD, DL,

15
test/CodeGen/X86/2011-06-01-fildll.ll Normal file
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@ -0,0 +1,15 @@
; RUN: llc %s -march=x86
; ModuleID = '<stdin>'
target datalayout = "e-p:32:32:32-i1:8:8-i8:8:8-i16:16:16-i32:32:32-i64:32:64-f32:32:32-f64:32:64-v64:64:64-v128:128:128-a0:0:64-f80:128:128-n8:16:32"
target triple = "i386-apple-macosx10.6.6"
define float @f(i64* nocapture %x) nounwind readonly ssp {
entry:
; CHECK: movl
; CHECK-NOT: movl
%tmp1 = load i64* %x, align 4
; CHECK: fildll
%conv = sitofp i64 %tmp1 to float
%add = fadd float %conv, 1.000000e+00
ret float %add
}