summaryrefslogtreecommitdiff
path: root/src/fenv/x86_64/fenv.s
blob: dda6b61a0b0bf61d9fce5bfeb3d605616c4d6bf4 (plain) (blame)
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
.global feclearexcept
.type feclearexcept,@function
feclearexcept:
		# maintain exceptions in the sse mxcsr, clear x87 exceptions
	mov %edi,%ecx
	fnstsw %ax
	test %eax,%ecx
	jz 1f
	fnclex
1:	stmxcsr -8(%rsp)
	and $0x3f,%eax
	or %eax,-8(%rsp)
	test %ecx,-8(%rsp)
	jz 1f
	not %ecx
	and %ecx,-8(%rsp)
	ldmxcsr -8(%rsp)
1:	xor %eax,%eax
	ret

.global feraiseexcept
.type feraiseexcept,@function
feraiseexcept:	
	stmxcsr -8(%rsp)
	or %edi,-8(%rsp)
	ldmxcsr -8(%rsp)
	xor %eax,%eax
	ret

.global fesetround
.type fesetround,@function
fesetround:
	push %rax
	xor %eax,%eax
	mov %edi,%ecx
	fnstcw (%rsp)
	andb $0xf3,1(%rsp)
	or %ch,1(%rsp)
	fldcw (%rsp)
	stmxcsr (%rsp)
	shl $3,%ch
	andb $0x9f,1(%rsp)
	or %ch,1(%rsp)
	ldmxcsr (%rsp)
	pop %rcx
	ret

.global fegetround
.type fegetround,@function
fegetround:
	push %rax
	stmxcsr (%rsp)
	pop %rax
	shr $3,%eax
	and $0xc00,%eax
	ret

.global fegetenv
.type fegetenv,@function
fegetenv:
	xor %eax,%eax
	fnstenv (%rdi)
	stmxcsr 28(%rdi)
	ret

.global fesetenv
.type fesetenv,@function
fesetenv:
	xor %eax,%eax
	inc %rdi
	jz 1f
	fldenv -1(%rdi)
	ldmxcsr 27(%rdi)
	ret
1:	push %rax
	push %rax
	push %rax
	pushq $0x37f
	fldenv (%rsp)
	pushq $0x1f80
	ldmxcsr (%rsp)
	add $40,%rsp
	ret

.global fetestexcept
.type fetestexcept,@function
fetestexcept:
	push %rax
	stmxcsr (%rsp)
	pop %rsi
	fnstsw %ax
	or %esi,%eax
	and %edi,%eax
	ret