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Small fix in InstCombineCasts.cpp. Restored "alloca + bitcast" reducing for case when alloca's size is calculated within the "add/sub/... nsw".
Also added fix to 2011-06-13-nsw-alloca.ll test. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@156231 91177308-0d34-0410-b5e6-96231b3b80d8
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@ -34,7 +34,7 @@ static Value *DecomposeSimpleLinearExpr(Value *Val, unsigned &Scale,
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if (BinaryOperator *I = dyn_cast<BinaryOperator>(Val)) {
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// Cannot look past anything that might overflow.
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OverflowingBinaryOperator *OBI = dyn_cast<OverflowingBinaryOperator>(Val);
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if (OBI && !OBI->hasNoUnsignedWrap()) {
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if (OBI && !OBI->hasNoUnsignedWrap() && !OBI->hasNoSignedWrap()) {
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Scale = 1;
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Offset = 0;
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return Val;
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@ -2,8 +2,10 @@
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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"
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target triple = "i386-apple-darwin10.0.0"
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; CHECK: define void @fu1
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define void @fu1(i32 %parm) nounwind ssp {
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%1 = alloca i32, align 4
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; CHECK: alloca double*
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%ptr = alloca double*, align 4
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store i32 %parm, i32* %1, align 4
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store double* null, double** %ptr, align 4
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@ -16,12 +18,12 @@ define void @fu1(i32 %parm) nounwind ssp {
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%6 = mul nsw i32 %5, 8
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; With "nsw", the alloca and its bitcast can be fused:
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%7 = add nsw i32 %6, 2048
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; CHECK: alloca double*
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; CHECK: alloca double
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%8 = alloca i8, i32 %7
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%9 = bitcast i8* %8 to double*
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; CHECK-NEXT: store double*
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store double* %9, double** %ptr, align 4
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br label %10
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; <label>:10 ; preds = %4, %0
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%11 = load double** %ptr, align 4
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call void @bar(double* %11)
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@ -31,6 +33,7 @@ define void @fu1(i32 %parm) nounwind ssp {
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declare void @bar(double*)
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; CHECK: define void @fu2
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define void @fu2(i32 %parm) nounwind ssp {
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%1 = alloca i32, align 4
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%ptr = alloca double*, align 4
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