sqrt-approx.ll
4.24 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
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
; RUN: llc < %s -march=nvptx -mcpu=sm_20 -nvptx-prec-divf32=0 -nvptx-prec-sqrtf32=0 \
; RUN: | FileCheck %s
target datalayout = "e-p:32:32:32-i1:8:8-i8:8:8-i16:16:16-i32:32:32-i64:64:64-f32:32:32-f64:64:64-v16:16:16-v32:32:32-v64:64:64-v128:128:128-n16:32:64"
declare float @llvm.sqrt.f32(float)
declare double @llvm.sqrt.f64(double)
; -- reciprocal sqrt --
; CHECK-LABEL test_rsqrt32
define float @test_rsqrt32(float %a) #0 {
; CHECK: rsqrt.approx.f32
%val = tail call float @llvm.sqrt.f32(float %a)
%ret = fdiv float 1.0, %val
ret float %ret
}
; CHECK-LABEL test_rsqrt_ftz
define float @test_rsqrt_ftz(float %a) #0 #1 {
; CHECK: rsqrt.approx.ftz.f32
%val = tail call float @llvm.sqrt.f32(float %a)
%ret = fdiv float 1.0, %val
ret float %ret
}
; CHECK-LABEL test_rsqrt64
define double @test_rsqrt64(double %a) #0 {
; CHECK: rsqrt.approx.f64
%val = tail call double @llvm.sqrt.f64(double %a)
%ret = fdiv double 1.0, %val
ret double %ret
}
; CHECK-LABEL test_rsqrt64_ftz
define double @test_rsqrt64_ftz(double %a) #0 #1 {
; There's no rsqrt.approx.ftz.f64 instruction; we just use the non-ftz version.
; CHECK: rsqrt.approx.f64
%val = tail call double @llvm.sqrt.f64(double %a)
%ret = fdiv double 1.0, %val
ret double %ret
}
; -- sqrt --
; CHECK-LABEL test_sqrt32
define float @test_sqrt32(float %a) #0 {
; CHECK: sqrt.approx.f32
%ret = tail call float @llvm.sqrt.f32(float %a)
ret float %ret
}
; CHECK-LABEL test_sqrt_ftz
define float @test_sqrt_ftz(float %a) #0 #1 {
; CHECK: sqrt.approx.ftz.f32
%ret = tail call float @llvm.sqrt.f32(float %a)
ret float %ret
}
; CHECK-LABEL test_sqrt64
define double @test_sqrt64(double %a) #0 {
; There's no sqrt.approx.f64 instruction; we emit
; reciprocal(rsqrt.approx.f64(x)). There's no non-ftz approximate reciprocal,
; so we just use the ftz version.
; CHECK: rsqrt.approx.f64
; CHECK: rcp.approx.ftz.f64
%ret = tail call double @llvm.sqrt.f64(double %a)
ret double %ret
}
; CHECK-LABEL test_sqrt64_ftz
define double @test_sqrt64_ftz(double %a) #0 #1 {
; There's no sqrt.approx.ftz.f64 instruction; we just use the non-ftz version.
; CHECK: rsqrt.approx.f64
; CHECK: rcp.approx.ftz.f64
%ret = tail call double @llvm.sqrt.f64(double %a)
ret double %ret
}
; -- refined sqrt and rsqrt --
;
; The sqrt and rsqrt refinement algorithms both emit an rsqrt.approx, followed
; by some math.
; CHECK-LABEL: test_rsqrt32_refined
define float @test_rsqrt32_refined(float %a) #0 #2 {
; CHECK: rsqrt.approx.f32
%val = tail call float @llvm.sqrt.f32(float %a)
%ret = fdiv float 1.0, %val
ret float %ret
}
; CHECK-LABEL: test_sqrt32_refined
define float @test_sqrt32_refined(float %a) #0 #2 {
; CHECK: rsqrt.approx.f32
%ret = tail call float @llvm.sqrt.f32(float %a)
ret float %ret
}
; CHECK-LABEL: test_rsqrt64_refined
define double @test_rsqrt64_refined(double %a) #0 #2 {
; CHECK: rsqrt.approx.f64
%val = tail call double @llvm.sqrt.f64(double %a)
%ret = fdiv double 1.0, %val
ret double %ret
}
; CHECK-LABEL: test_sqrt64_refined
define double @test_sqrt64_refined(double %a) #0 #2 {
; CHECK: rsqrt.approx.f64
%ret = tail call double @llvm.sqrt.f64(double %a)
ret double %ret
}
; -- refined sqrt and rsqrt with ftz enabled --
; CHECK-LABEL: test_rsqrt32_refined_ftz
define float @test_rsqrt32_refined_ftz(float %a) #0 #1 #2 {
; CHECK: rsqrt.approx.ftz.f32
%val = tail call float @llvm.sqrt.f32(float %a)
%ret = fdiv float 1.0, %val
ret float %ret
}
; CHECK-LABEL: test_sqrt32_refined_ftz
define float @test_sqrt32_refined_ftz(float %a) #0 #1 #2 {
; CHECK: rsqrt.approx.ftz.f32
%ret = tail call float @llvm.sqrt.f32(float %a)
ret float %ret
}
; CHECK-LABEL: test_rsqrt64_refined_ftz
define double @test_rsqrt64_refined_ftz(double %a) #0 #1 #2 {
; There's no rsqrt.approx.ftz.f64, so we just use the non-ftz version.
; CHECK: rsqrt.approx.f64
%val = tail call double @llvm.sqrt.f64(double %a)
%ret = fdiv double 1.0, %val
ret double %ret
}
; CHECK-LABEL: test_sqrt64_refined_ftz
define double @test_sqrt64_refined_ftz(double %a) #0 #1 #2 {
; CHECK: rsqrt.approx.f64
%ret = tail call double @llvm.sqrt.f64(double %a)
ret double %ret
}
attributes #0 = { "unsafe-fp-math" = "true" }
attributes #1 = { "nvptx-f32ftz" = "true" }
attributes #2 = { "reciprocal-estimates" = "rsqrtf:1,rsqrtd:1,sqrtf:1,sqrtd:1" }