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
52
53
54
55
56
57
|
; RUN: llc < %s -mtriple=x86_64-linux | FileCheck %s
; RUN: llc < %s -mtriple=x86_64-win32 | FileCheck %s
; Reuse the flags value from the add instructions instead of emitting separate
; testl instructions.
; Use the flags on the add.
; CHECK-LABEL: test1:
; CHECK: addl
; CHECK-NOT: test
; CHECK: cmovnsl
; CHECK: ret
define i32 @test1(i32* %x, i32 %y, i32 %a, i32 %b) nounwind {
%tmp2 = load i32* %x, align 4 ; <i32> [#uses=1]
%tmp4 = add i32 %tmp2, %y ; <i32> [#uses=1]
%tmp5 = icmp slt i32 %tmp4, 0 ; <i1> [#uses=1]
%tmp.0 = select i1 %tmp5, i32 %a, i32 %b ; <i32> [#uses=1]
ret i32 %tmp.0
}
declare void @foo(i32)
; Don't use the flags result of the and here, since the and has no
; other use. A simple test is better.
; CHECK-LABEL: test2:
; CHECK: testb $16, {{%dil|%cl}}
define void @test2(i32 %x) nounwind {
%y = and i32 %x, 16
%t = icmp eq i32 %y, 0
br i1 %t, label %true, label %false
true:
call void @foo(i32 %x)
ret void
false:
ret void
}
; Do use the flags result of the and here, since the and has another use.
; CHECK-LABEL: test3:
; CHECK: andl $16, %e
; CHECK-NEXT: jne
define void @test3(i32 %x) nounwind {
%y = and i32 %x, 16
%t = icmp eq i32 %y, 0
br i1 %t, label %true, label %false
true:
call void @foo(i32 %y)
ret void
false:
ret void
}
|
