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
|
; NOTE: Assertions have been autogenerated by utils/update_llc_test_checks.py
; RUN: llc < %s -mtriple=x86_64-- -mcpu=x86-64 | FileCheck %s -check-prefix=X64
; RUN: llc < %s -mtriple=i686-unknown | FileCheck %s -check-prefix=X86
declare float @llvm.sqrt.f32(float %x);
define dso_local float @fast_recip_sqrt(float %x) {
; X64-LABEL: fast_recip_sqrt:
; X64: # %bb.0:
; X64-NEXT: rsqrtss %xmm0, %xmm1
; X64-NEXT: mulss %xmm1, %xmm0
; X64-NEXT: mulss %xmm1, %xmm0
; X64-NEXT: addss {{\.?LCPI[0-9]+_[0-9]+}}(%rip), %xmm0
; X64-NEXT: mulss {{\.?LCPI[0-9]+_[0-9]+}}(%rip), %xmm1
; X64-NEXT: mulss %xmm1, %xmm0
; X64-NEXT: retq
;
; X86-LABEL: fast_recip_sqrt:
; X86: # %bb.0:
; X86-NEXT: flds {{[0-9]+}}(%esp)
; X86-NEXT: fsqrt
; X86-NEXT: fld1
; X86-NEXT: fdivp %st, %st(1)
; X86-NEXT: retl
%y = call fast float @llvm.sqrt.f32(float %x)
%z = fdiv fast float 1.0, %y
ret float %z
}
declare float @llvm.fmuladd.f32(float %a, float %b, float %c);
define dso_local float @fast_fmuladd_opts(float %a , float %b , float %c) {
; X64-LABEL: fast_fmuladd_opts:
; X64: # %bb.0:
; X64-NEXT: mulss {{\.?LCPI[0-9]+_[0-9]+}}(%rip), %xmm0
; X64-NEXT: retq
;
; X86-LABEL: fast_fmuladd_opts:
; X86: # %bb.0:
; X86-NEXT: flds {{[0-9]+}}(%esp)
; X86-NEXT: fmuls {{\.?LCPI[0-9]+_[0-9]+}}
; X86-NEXT: retl
%res = call fast float @llvm.fmuladd.f32(float %a, float 2.0, float %a)
ret float %res
}
; The multiply is strict.
@mul1 = common dso_local global double 0.000000e+00, align 4
define dso_local double @not_so_fast_mul_add(double %x) {
; X64-LABEL: not_so_fast_mul_add:
; X64: # %bb.0:
; X64-NEXT: movsd {{.*#+}} xmm1 = [4.2000000000000002E+0,0.0E+0]
; X64-NEXT: mulsd %xmm0, %xmm1
; X64-NEXT: mulsd {{\.?LCPI[0-9]+_[0-9]+}}(%rip), %xmm0
; X64-NEXT: movsd %xmm1, mul1(%rip)
; X64-NEXT: retq
;
; X86-LABEL: not_so_fast_mul_add:
; X86: # %bb.0:
; X86-NEXT: fldl {{[0-9]+}}(%esp)
; X86-NEXT: fld %st(0)
; X86-NEXT: fmull {{\.?LCPI[0-9]+_[0-9]+}}
; X86-NEXT: fxch %st(1)
; X86-NEXT: fmull {{\.?LCPI[0-9]+_[0-9]+}}
; X86-NEXT: fxch %st(1)
; X86-NEXT: fstpl mul1
; X86-NEXT: retl
%m = fmul double %x, 4.2
%a = fadd fast double %m, %x
store double %m, ptr @mul1, align 4
ret double %a
}
; The sqrt is strict.
@sqrt1 = common dso_local global float 0.000000e+00, align 4
define dso_local float @not_so_fast_recip_sqrt(float %x) {
; X64-LABEL: not_so_fast_recip_sqrt:
; X64: # %bb.0:
; X64-NEXT: rsqrtss %xmm0, %xmm1
; X64-NEXT: sqrtss %xmm0, %xmm2
; X64-NEXT: mulss %xmm1, %xmm0
; X64-NEXT: mulss %xmm1, %xmm0
; X64-NEXT: addss {{\.?LCPI[0-9]+_[0-9]+}}(%rip), %xmm0
; X64-NEXT: mulss {{\.?LCPI[0-9]+_[0-9]+}}(%rip), %xmm1
; X64-NEXT: mulss %xmm1, %xmm0
; X64-NEXT: movss %xmm2, sqrt1(%rip)
; X64-NEXT: retq
;
; X86-LABEL: not_so_fast_recip_sqrt:
; X86: # %bb.0:
; X86-NEXT: flds {{[0-9]+}}(%esp)
; X86-NEXT: fsqrt
; X86-NEXT: fld1
; X86-NEXT: fdiv %st(1), %st
; X86-NEXT: fxch %st(1)
; X86-NEXT: fstps sqrt1
; X86-NEXT: retl
%y = call float @llvm.sqrt.f32(float %x)
%z = fdiv fast float 1.0, %y
store float %y, ptr @sqrt1, align 4
%ret = fadd float %z , 14.5
ret float %z
}
define dso_local float @div_arcp_by_const(half %x) {
; X64-LABEL: div_arcp_by_const:
; X64: # %bb.0:
; X64-NEXT: pushq %rax
; X64-NEXT: .cfi_def_cfa_offset 16
; X64-NEXT: callq __extendhfsf2@PLT
; X64-NEXT: mulss {{\.?LCPI[0-9]+_[0-9]+}}(%rip), %xmm0
; X64-NEXT: callq __truncsfhf2@PLT
; X64-NEXT: popq %rax
; X64-NEXT: .cfi_def_cfa_offset 8
; X64-NEXT: jmp __extendhfsf2@PLT # TAILCALL
;
; X86-LABEL: div_arcp_by_const:
; X86: # %bb.0:
; X86-NEXT: pushl %eax
; X86-NEXT: .cfi_def_cfa_offset 8
; X86-NEXT: movzwl {{[0-9]+}}(%esp), %eax
; X86-NEXT: movl %eax, (%esp)
; X86-NEXT: calll __extendhfsf2
; X86-NEXT: fmuls {{\.?LCPI[0-9]+_[0-9]+}}
; X86-NEXT: fstps (%esp)
; X86-NEXT: calll __truncsfhf2
; X86-NEXT: movzwl %ax, %eax
; X86-NEXT: movl %eax, (%esp)
; X86-NEXT: calll __extendhfsf2
; X86-NEXT: popl %eax
; X86-NEXT: .cfi_def_cfa_offset 4
; X86-NEXT: retl
%rcp = fdiv arcp half %x, 10.0
%z = fpext half %rcp to float
ret float %z
}
|
