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
58
59
60
61
62
63
64
65
66
67
68
|
; NOTE: Assertions have been autogenerated by utils/update_llc_test_checks.py
; RUN: llc -o - %s | FileCheck %s
target triple = "x86_64-unknown-unknown"
; select with and i1/or i1 condition should be implemented as a series of 2
; cmovs, not by producing two conditions and using and on them.
define i32 @select_and(i32 %a0, i32 %a1, float %a2, float %a3, i32 %a4, i32 %a5) {
; CHECK-LABEL: select_and:
; CHECK: # %bb.0:
; CHECK-NEXT: movl %edx, %eax
; CHECK-NEXT: ucomiss %xmm0, %xmm1
; CHECK-NEXT: cmovbel %ecx, %eax
; CHECK-NEXT: cmpl %esi, %edi
; CHECK-NEXT: cmovael %ecx, %eax
; CHECK-NEXT: retq
%cmp0 = icmp ult i32 %a0, %a1
%cmp1 = fcmp olt float %a2, %a3
%and = and i1 %cmp0, %cmp1
%res = select i1 %and, i32 %a4, i32 %a5
ret i32 %res
}
; select with and i1 condition should be implemented as a series of 2 cmovs, not
; by producing two conditions and using and on them.
define i32 @select_or(i32 %a0, i32 %a1, float %a2, float %a3, i32 %a4, i32 %a5) {
; CHECK-LABEL: select_or:
; CHECK: # %bb.0:
; CHECK-NEXT: movl %ecx, %eax
; CHECK-NEXT: ucomiss %xmm0, %xmm1
; CHECK-NEXT: cmoval %edx, %eax
; CHECK-NEXT: cmpl %esi, %edi
; CHECK-NEXT: cmovbl %edx, %eax
; CHECK-NEXT: retq
%cmp0 = icmp ult i32 %a0, %a1
%cmp1 = fcmp olt float %a2, %a3
%and = or i1 %cmp0, %cmp1
%res = select i1 %and, i32 %a4, i32 %a5
ret i32 %res
}
; If one of the conditions is materialized as a 0/1 value anyway, then the
; sequence of 2 cmovs should not be used.
@var32 = global i32 0
define i32 @select_noopt(i32 %a0, i32 %a1, i32 %a2, i32 %a3, i32 %a4) {
; CHECK-LABEL: select_noopt:
; CHECK: # %bb.0:
; CHECK-NEXT: movl %ecx, %eax
; CHECK-NEXT: cmpl %esi, %edi
; CHECK-NEXT: setb %cl
; CHECK-NEXT: cmpl %edx, %esi
; CHECK-NEXT: setb %dl
; CHECK-NEXT: orb %cl, %dl
; CHECK-NEXT: movzbl %dl, %ecx
; CHECK-NEXT: movl %ecx, {{.*}}(%rip)
; CHECK-NEXT: testb %cl, %cl
; CHECK-NEXT: cmovel %r8d, %eax
; CHECK-NEXT: retq
%cmp0 = icmp ult i32 %a0, %a1
%cmp1 = icmp ult i32 %a1, %a2
%or = or i1 %cmp0, %cmp1
%zero_one = zext i1 %or to i32
store volatile i32 %zero_one, i32* @var32
%res = select i1 %or, i32 %a3, i32 %a4
ret i32 %res
}
|
