1; RUN: opt -S -instcombine < %s | FileCheck %s
2target 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"
3target triple = "i386-apple-darwin10.0.0"
4
5; CHECK-LABEL: define void @fu1(
6define void @fu1(i32 %parm) nounwind ssp {
7  %1 = alloca i32, align 4
8; CHECK: alloca double*
9  %ptr = alloca double*, align 4
10  store i32 %parm, i32* %1, align 4
11  store double* null, double** %ptr, align 4
12  %2 = load i32, i32* %1, align 4
13  %3 = icmp ne i32 %2, 0
14  br i1 %3, label %4, label %10
15
16; <label>:4                                       ; preds = %0
17  %5 = load i32, i32* %1, align 4
18  %6 = shl nsw i32 %5, 3
19; With "nsw", the alloca and its bitcast can be fused:
20  %7 = add nsw i32 %6, 2048
21;  CHECK: alloca double
22  %8 = alloca i8, i32 %7
23  %9 = bitcast i8* %8 to double*
24; CHECK-NEXT: store double*
25  store double* %9, double** %ptr, align 4
26  br label %10
27; <label>:10                                      ; preds = %4, %0
28  %11 = load double*, double** %ptr, align 4
29  call void @bar(double* %11)
30; CHECK: ret
31  ret void
32}
33
34declare void @bar(double*)
35
36; CHECK-LABEL: define void @fu2(
37define void @fu2(i32 %parm) nounwind ssp {
38  %1 = alloca i32, align 4
39  %ptr = alloca double*, align 4
40  store i32 %parm, i32* %1, align 4
41  store double* null, double** %ptr, align 4
42  %2 = load i32, i32* %1, align 4
43  %3 = icmp ne i32 %2, 0
44  br i1 %3, label %4, label %10
45
46; <label>:4                                       ; preds = %0
47  %5 = load i32, i32* %1, align 4
48  %6 = mul nsw i32 %5, 8
49; Without "nsw", the alloca and its bitcast cannot be fused:
50  %7 = add  i32 %6, 2048
51; CHECK: alloca i8
52  %8 = alloca i8, i32 %7
53; CHECK-NEXT: bitcast double**
54; CHECK-NEXT: store i8*
55  %9 = bitcast i8* %8 to double*
56  store double* %9, double** %ptr, align 4
57  br label %10
58
59; <label>:10                                      ; preds = %4, %0
60  %11 = load double*, double** %ptr, align 4
61  call void @bar(double* %11)
62  ret void
63}
64
65