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X86: Fix a bug in EltsFromConsecutiveLoads. We can't generate new loads without chains.

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@182507 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Nadav Rotem 2013-05-22 19:28:41 +00:00
parent 9e8dbe0d2d
commit 23d1d5eb56
2 changed files with 58 additions and 8 deletions
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28
lib/Target/X86/X86ISelLowering.cpp
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@ -5109,15 +5109,27 @@ static SDValue EltsFromConsecutiveLoads(EVT VT, SmallVectorImpl<SDValue> &Elts,
// load of the entire vector width starting at the base pointer. If we found
// consecutive loads for the low half, generate a vzext_load node.
if (LastLoadedElt == NumElems - 1) {
SDValue NewLd = SDValue();
if (DAG.InferPtrAlignment(LDBase->getBasePtr()) >= 16)
return DAG.getLoad(VT, DL, LDBase->getChain(), LDBase->getBasePtr(),
LDBase->getPointerInfo(),
LDBase->isVolatile(), LDBase->isNonTemporal(),
LDBase->isInvariant(), 0);
return DAG.getLoad(VT, DL, LDBase->getChain(), LDBase->getBasePtr(),
LDBase->getPointerInfo(),
LDBase->isVolatile(), LDBase->isNonTemporal(),
LDBase->isInvariant(), LDBase->getAlignment());
NewLd = DAG.getLoad(VT, DL, LDBase->getChain(), LDBase->getBasePtr(),
LDBase->getPointerInfo(),
LDBase->isVolatile(), LDBase->isNonTemporal(),
LDBase->isInvariant(), 0);
NewLd = DAG.getLoad(VT, DL, LDBase->getChain(), LDBase->getBasePtr(),
LDBase->getPointerInfo(),
LDBase->isVolatile(), LDBase->isNonTemporal(),
LDBase->isInvariant(), LDBase->getAlignment());
if (LDBase->hasAnyUseOfValue(1)) {
SDValue NewChain = DAG.getNode(ISD::TokenFactor, DL, MVT::Other,
SDValue(LDBase, 1),
SDValue(NewLd.getNode(), 1));
DAG.ReplaceAllUsesOfValueWith(SDValue(LDBase, 1), NewChain);
DAG.UpdateNodeOperands(NewChain.getNode(), SDValue(LDBase, 1),
SDValue(NewLd.getNode(), 1));
}
return NewLd;
}
if (NumElems == 4 && LastLoadedElt == 1 &&
DAG.getTargetLoweringInfo().isTypeLegal(MVT::v2i64)) {

38
test/CodeGen/X86/chain_order.ll Normal file
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@ -0,0 +1,38 @@
; RUN: llc < %s -mcpu=corei7-avx -mtriple=x86_64-linux | FileCheck %s
;CHECK: cftx020
;CHECK: vmovsd (%rdi), %xmm{{.*}}
;CHECK: vmovsd 16(%rdi), %xmm{{.*}}
;CHECK: vmovhpd 8(%rdi), %xmm{{.*}}
;CHECK: vmovsd 24(%rdi), %xmm{{.*}}
;CHECK: vmovupd %xmm{{.*}}, (%rdi)
;CHECK: vmovupd %xmm{{.*}}, 16(%rdi)
;CHECK: ret
; A test from pifft (after SLP-vectorization) that fails when we drop the chain on newly merged loads.
define void @cftx020(double* nocapture %a) {
entry:
%0 = load double* %a, align 8
%arrayidx1 = getelementptr inbounds double* %a, i64 2
%1 = load double* %arrayidx1, align 8
%arrayidx2 = getelementptr inbounds double* %a, i64 1
%2 = load double* %arrayidx2, align 8
%arrayidx3 = getelementptr inbounds double* %a, i64 3
%3 = load double* %arrayidx3, align 8
%4 = insertelement <2 x double> undef, double %0, i32 0
%5 = insertelement <2 x double> %4, double %3, i32 1
%6 = insertelement <2 x double> undef, double %1, i32 0
%7 = insertelement <2 x double> %6, double %2, i32 1
%8 = fadd <2 x double> %5, %7
%9 = bitcast double* %a to <2 x double>*
store <2 x double> %8, <2 x double>* %9, align 8
%10 = insertelement <2 x double> undef, double %0, i32 0
%11 = insertelement <2 x double> %10, double %2, i32 1
%12 = insertelement <2 x double> undef, double %1, i32 0
%13 = insertelement <2 x double> %12, double %3, i32 1
%14 = fsub <2 x double> %11, %13
%15 = bitcast double* %arrayidx1 to <2 x double>*
store <2 x double> %14, <2 x double>* %15, align 8
ret void
}