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64 lines
1.9 KiB
LLVM
64 lines
1.9 KiB
LLVM
; RUN: opt -S -instcombine < %s | FileCheck %s
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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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%2 = load i32* %1, align 4
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%3 = icmp ne i32 %2, 0
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br i1 %3, label %4, label %10
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; <label>:4 ; preds = %0
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%5 = load i32* %1, align 4
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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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%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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; CHECK: ret
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ret void
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}
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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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store i32 %parm, i32* %1, align 4
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store double* null, double** %ptr, align 4
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%2 = load i32* %1, align 4
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%3 = icmp ne i32 %2, 0
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br i1 %3, label %4, label %10
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; <label>:4 ; preds = %0
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%5 = load i32* %1, align 4
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%6 = mul nsw i32 %5, 8
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; Without "nsw", the alloca and its bitcast cannot be fused:
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%7 = add i32 %6, 2048
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; CHECK: alloca i8
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%8 = alloca i8, i32 %7
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; CHECK-NEXT: bitcast i8*
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%9 = bitcast i8* %8 to 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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ret void
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}
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