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BBVectorize: Fix a small bug introduced in r167042.

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We need to make sure that we take the correct load/store alignment
when the inputs are flipped.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@167044 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Hal Finkel 2012-10-30 19:47:37 +00:00
parent b33b34a7dc
commit 8a69a95f91
2 changed files with 28 additions and 1 deletions
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1
lib/Transforms/Vectorize/BBVectorize.cpp
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@ -2472,7 +2472,6 @@ namespace {
Instruction *L = I, *H = J;
if (FlipMemInputs)
std::swap(H, L);
FlipMemInputs = false;
unsigned NumOperands = I->getNumOperands();
SmallVector<Value *, 3> ReplacedOperands(NumOperands);

28
test/Transforms/BBVectorize/simple-ldstr.ll
View File

@ -140,3 +140,31 @@ if.end:
; CHECK-AO-NOT: <2 x double>
}
; Simple 3-pair chain with loads and stores
define void @test5(double* %a, double* %b, double* %c) nounwind uwtable readonly {
entry:
%i0 = load double* %a, align 8
%i1 = load double* %b, align 8
%mul = fmul double %i0, %i1
%arrayidx3 = getelementptr inbounds double* %a, i64 1
%i3 = load double* %arrayidx3, align 8
%arrayidx4 = getelementptr inbounds double* %b, i64 1
%i4 = load double* %arrayidx4, align 8
%mul5 = fmul double %i3, %i4
%arrayidx5 = getelementptr inbounds double* %c, i64 1
store double %mul5, double* %arrayidx5, align 8
store double %mul, double* %c, align 4
ret void
; CHECK: @test5
; CHECK: %i0.v.i0 = bitcast double* %a to <2 x double>*
; CHECK: %i1.v.i0 = bitcast double* %b to <2 x double>*
; CHECK: %i0 = load <2 x double>* %i0.v.i0, align 8
; CHECK: %i1 = load <2 x double>* %i1.v.i0, align 8
; CHECK: %mul = fmul <2 x double> %i0, %i1
; CHECK: %0 = bitcast double* %c to <2 x double>*
; CHECK: store <2 x double> %mul, <2 x double>* %0, align 4
; CHECK: ret void
; CHECK-AO: @test5
; CHECK-AO-NOT: <2 x double>
}