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
| ; RUN: llc < %s -mtriple=x86_64-unknown-linux-gnu -mcpu=corei7 -mattr=-f16c | FileCheck %s -check-prefix=CHECK -check-prefix=LIBCALL
; RUN: llc < %s -mtriple=x86_64-unknown-linux-gnu -mcpu=corei7 -mattr=+f16c | FileCheck %s -check-prefix=CHECK -check-prefix=F16C
; RUN: llc < %s -mtriple=x86_64-unknown-linux-gnu -mcpu=corei7 -mattr=-f16c,+soft-float | FileCheck %s -check-prefix=CHECK -check-prefix=SOFTFLOAT
; RUN: llc < %s -mtriple=x86_64-unknown-linux-gnu -mcpu=corei7 -mattr=+f16c,+soft-float | FileCheck %s -check-prefix=CHECK -check-prefix=SOFTFLOAT
; This is a test for float to half float conversions on x86-64.
;
; If flag -soft-float is set, or if there is no F16C support, then:
; 1) half float to float conversions are
; translated into calls to __gnu_h2f_ieee defined
; by the compiler runtime library;
; 2) float to half float conversions are translated into calls
; to __gnu_f2h_ieee which expected to be defined by the
; compiler runtime library.
;
; Otherwise (we have F16C support):
; 1) half float to float conversion are translated using
; vcvtph2ps instructions;
; 2) float to half float conversions are translated using
; vcvtps2ph instructions
define void @test1(float %src, i16* %dest) {
%1 = tail call i16 @llvm.convert.to.fp16.f32(float %src)
store i16 %1, i16* %dest, align 2
ret void
}
; CHECK-LABEL: test1
; LIBCALL: callq __gnu_f2h_ieee
; SOFTFLOAT: callq __gnu_f2h_ieee
; F16C: vcvtps2ph
; CHECK: ret
define float @test2(i16* nocapture %src) {
%1 = load i16, i16* %src, align 2
%2 = tail call float @llvm.convert.from.fp16.f32(i16 %1)
ret float %2
}
; CHECK-LABEL: test2:
; LIBCALL: jmp __gnu_h2f_ieee
; SOFTFLOAT: callq __gnu_h2f_ieee
; F16C: vcvtph2ps
; F16C: ret
define float @test3(float %src) nounwind uwtable readnone {
%1 = tail call i16 @llvm.convert.to.fp16.f32(float %src)
%2 = tail call float @llvm.convert.from.fp16.f32(i16 %1)
ret float %2
}
; CHECK-LABEL: test3:
; LIBCALL: callq __gnu_f2h_ieee
; LIBCALL: jmp __gnu_h2f_ieee
; SOFTFLOAT: callq __gnu_f2h_ieee
; SOFTFLOAT: callq __gnu_h2f_ieee
; F16C: vcvtps2ph
; F16C-NEXT: vcvtph2ps
; F16C: ret
define double @test4(i16* nocapture %src) {
%1 = load i16, i16* %src, align 2
%2 = tail call double @llvm.convert.from.fp16.f64(i16 %1)
ret double %2
}
; CHECK-LABEL: test4:
; LIBCALL: callq __gnu_h2f_ieee
; LIBCALL: cvtss2sd
; SOFTFLOAT: callq __gnu_h2f_ieee
; SOFTFLOAT: callq __extendsfdf2
; F16C: vcvtph2ps
; F16C: vcvtss2sd
; F16C: ret
define i16 @test5(double %src) {
%val = tail call i16 @llvm.convert.to.fp16.f64(double %src)
ret i16 %val
}
; CHECK-LABEL: test5:
; LIBCALL: jmp __truncdfhf2
; SOFTFLOAT: callq __truncdfhf2
; F16C: jmp __truncdfhf2
declare float @llvm.convert.from.fp16.f32(i16) nounwind readnone
declare i16 @llvm.convert.to.fp16.f32(float) nounwind readnone
declare double @llvm.convert.from.fp16.f64(i16) nounwind readnone
declare i16 @llvm.convert.to.fp16.f64(double) nounwind readnone
|