1; RUN: opt -O3 -S < %s | FileCheck %s
2
3target datalayout = "e-p:64:64:64-i1:8:8-i8:8:8-i16:16:16-i32:32:32-i64:64:64-f32:32:32-f64:64:64-v64:64:64-v128:128:128-a0:0:64-s0:64:64-f80:128:128-n8:16:32:64"
4target triple = "x86_64-apple-macosx10.6.7"
5
6declare i8* @malloc(i64)
7declare void @free(i8*)
8
9
10; PR2338
11define void @test1() nounwind ssp {
12  %retval = alloca i32, align 4
13  %i = alloca i8*, align 8
14  %call = call i8* @malloc(i64 1)
15  store i8* %call, i8** %i, align 8
16  %tmp = load i8** %i, align 8
17  store i8 1, i8* %tmp
18  %tmp1 = load i8** %i, align 8
19  call void @free(i8* %tmp1)
20  ret void
21
22; CHECK-LABEL: @test1(
23; CHECK-NEXT: ret void
24}
25
26; This function exposes a phase ordering problem when InstCombine is
27; turning %add into a bitmask, making it difficult to spot a 0 return value.
28;
29; It it also important that %add is expressed as a multiple of %div so scalar
30; evolution can recognize it.
31define i32 @test2(i32 %a, i32* %p) nounwind uwtable ssp {
32entry:
33  %div = udiv i32 %a, 4
34  %arrayidx = getelementptr inbounds i32* %p, i64 0
35  store i32 %div, i32* %arrayidx, align 4
36  %add = add i32 %div, %div
37  %arrayidx1 = getelementptr inbounds i32* %p, i64 1
38  store i32 %add, i32* %arrayidx1, align 4
39  %arrayidx2 = getelementptr inbounds i32* %p, i64 1
40  %0 = load i32* %arrayidx2, align 4
41  %arrayidx3 = getelementptr inbounds i32* %p, i64 0
42  %1 = load i32* %arrayidx3, align 4
43  %mul = mul i32 2, %1
44  %sub = sub i32 %0, %mul
45  ret i32 %sub
46
47; CHECK-LABEL: @test2(
48; CHECK: %div = lshr i32 %a, 2
49; CHECK: %add = shl nuw nsw i32 %div, 1
50; CHECK: ret i32 0
51}
52