hoist-convergent.ll
2.43 KB
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
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
; RUN: opt -gvn-hoist -S < %s | FileCheck %s
; Check that convergent calls are not hoisted.
;
; CHECK-LABEL: @no_convergent_func_hoisting(
; CHECK: if.then:
; CHECK: call float @convergent_func(
; CHECK: if.else:
; CHECK: call float @convergent_func(
define float @no_convergent_func_hoisting(float %d, float %min, float %max, float %a) {
entry:
%div = fdiv float 1.000000e+00, %d
%cmp = fcmp oge float %div, 0.000000e+00
br i1 %cmp, label %if.then, label %if.else
if.then:
%sub1 = fsub float %max, %a
%mul2 = call float @convergent_func(float %sub1, float %div)
br label %if.end
if.else:
%sub5 = fsub float %max, %a
%mul6 = call float @convergent_func(float %sub5, float %div)
br label %if.end
if.end:
%tmax.0 = phi float [ %mul2, %if.then ], [ %mul6, %if.else ]
%add = fadd float %tmax.0, 10.0
ret float %add
}
; The call site is convergent but the declaration is not.
; CHECK-LABEL: @no_convergent_call_hoisting(
; CHECK: if.then:
; CHECK: call float @func(
; CHECK: if.else:
; CHECK: call float @func(
define float @no_convergent_call_hoisting(float %d, float %min, float %max, float %a) {
entry:
%div = fdiv float 1.000000e+00, %d
%cmp = fcmp oge float %div, 0.000000e+00
br i1 %cmp, label %if.then, label %if.else
if.then:
%sub1 = fsub float %max, %a
%mul2 = call float @func(float %sub1, float %div) #0
br label %if.end
if.else:
%sub5 = fsub float %max, %a
%mul6 = call float @func(float %sub5, float %div) #0
br label %if.end
if.end:
%tmax.0 = phi float [ %mul2, %if.then ], [ %mul6, %if.else ]
%add = fadd float %tmax.0, 10.0
ret float %add
}
; The call site is convergent but the declaration is not.
; CHECK-LABEL: @call_hoisting(
; CHECK: call float @func(
; CHECK-NOT: call float @func(
define float @call_hoisting(float %d, float %min, float %max, float %a) {
entry:
%div = fdiv float 1.000000e+00, %d
%cmp = fcmp oge float %div, 0.000000e+00
br i1 %cmp, label %if.then, label %if.else
if.then:
%sub1 = fsub float %max, %a
%mul2 = call float @func(float %sub1, float %div)
br label %if.end
if.else:
%sub5 = fsub float %max, %a
%mul6 = call float @func(float %sub5, float %div)
br label %if.end
if.end:
%tmax.0 = phi float [ %mul2, %if.then ], [ %mul6, %if.else ]
%add = fadd float %tmax.0, 10.0
ret float %add
}
declare float @convergent_func(float, float) #0
declare float @func(float, float) #1
attributes #0 = { nounwind readnone convergent }
attributes #1 = { nounwind readnone }