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
|
/* $OpenBSD: fpsetround.S,v 1.3 2018/07/03 23:14:05 mortimer Exp $ */
/* $NetBSD: fpsetround.S,v 1.3 2002/06/12 19:17:22 fvdl Exp $ */
/*
* Written by Frank van der Linden at Wasabi Systems for NetBSD.
* Public domain.
*/
#include <machine/asm.h>
/*
* XXX set both the x87 control word and the SSE mxcsr register.
* Applications should only set exception and round flags
* via the fp*() interface, otherwise the status words
* will get our of sync.
*/
#ifdef WEAK_ALIAS
WEAK_ALIAS(fpsetround, _fpsetround)
ENTRY(_fpsetround)
#else
ENTRY(fpsetround)
#endif
RETGUARD_SETUP(fpsetround, r11)
fnstcw -4(%rsp)
stmxcsr -8(%rsp)
andl $3,%edi
movl -4(%rsp),%edx
rorl $10,%edx
movl %edx,%eax
andl $3,%eax
andl $~3,%edx
orl %edi,%edx
roll $10,%edx
movl %edx,-4(%rsp)
movl -8(%rsp),%edx
rorl $13,%edx
andl $~3,%edx
orl %edi,%edx
roll $13,%edx
movl %edx,-8(%rsp)
ldmxcsr -8(%rsp)
fldcw -4(%rsp)
RETGUARD_CHECK(fpsetround, r11)
ret
#ifdef WEAK_ALIAS
END(_fpsetround)
#else
END(fpsetround)
#endif
|
