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