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Fix incorrect invariant check in DAG Combine

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Earlier this summer I fixed an issue where we were incorrectly combining
multiple loads that had different constraints such alignment, invariance,
temporality, etc. Apparently in one case I made copt paste error and swapped
alignment and invariance.

Tests included.

rdar://18816719

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@220933 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Louis Gerbarg 2014-10-30 22:21:03 +00:00
parent 8744520b53
commit 4c77b29082
2 changed files with 37 additions and 1 deletions
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2
lib/CodeGen/SelectionDAG/DAGCombiner.cpp
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@ -11542,7 +11542,7 @@ bool DAGCombiner::SimplifySelectOps(SDNode *TheSelect, SDValue LHS,
// It is safe to replace the two loads if they have different alignments,
// but the new load must be the minimum (most restrictive) alignment of the
// inputs.
bool isInvariant = LLD->getAlignment() & RLD->getAlignment();
bool isInvariant = LLD->isInvariant() & RLD->isInvariant();
unsigned Alignment = std::min(LLD->getAlignment(), RLD->getAlignment());
if (LLD->getExtensionType() == ISD::NON_EXTLOAD) {
Load = DAG.getLoad(TheSelect->getValueType(0),

36
test/CodeGen/AArch64/dag-combine-invaraints.ll Normal file
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@ -0,0 +1,36 @@
; RUN: llc -mtriple=arm64-apple-darwin8.0 -relocation-model=pic -O1 < %s | FileCheck %s
@.str2 = private unnamed_addr constant [9 x i8] c"_%d____\0A\00", align 1
; Function Attrs: nounwind ssp
define i32 @main(i32 %argc, i8** %argv) #0 {
main_:
%tmp = alloca i32, align 4
%i32T = alloca i32, align 4
%i32F = alloca i32, align 4
%i32X = alloca i32, align 4
store i32 0, i32* %tmp
store i32 15, i32* %i32T, align 4
store i32 5, i32* %i32F, align 4
%tmp6 = load i32* %tmp, align 4
%tmp7 = icmp ne i32 %tmp6, 0
%tmp8 = xor i1 %tmp7, true
%tmp9 = load i32* %i32T, align 4
%tmp10 = load i32* %i32F, align 4
%DHSelect = select i1 %tmp8, i32 %tmp9, i32 %tmp10
store i32 %DHSelect, i32* %i32X, align 4
%tmp15 = load i32* %i32X, align 4
%tmp17 = call i32 (i8*, ...)* @printf(i8* getelementptr inbounds ([9 x i8]* @.str2, i32 0, i32 0), i32 %tmp15)
ret i32 0
; CHECK: main:
; CHECK-DAG: movz
; CHECK-DAG: orr
; CHECK: csel
}
declare i32 @printf(i8*, ...) #1
attributes #0 = { nounwind ssp "less-precise-fpmad"="false" "no-frame-pointer-elim"="true" "no-frame-pointer-elim-non-leaf" "no-infs-fp-math"="false" "no-nans-fp-math"="false" "stack-protector-buffer-size"="8" "unsafe-fp-math"="false" "use-soft-float"="false" }
attributes #1 = { "less-precise-fpmad"="false" "no-frame-pointer-elim"="true" "no-frame-pointer-elim-non-leaf" "no-infs-fp-math"="false" "no-nans-fp-math"="false" "stack-protector-buffer-size"="8" "unsafe-fp-math"="false" "use-soft-float"="false" }