1 /* Set FP exception mask and rounding mode. Mach/Alpha version.
2 Copyright (C) 2002 Free Software Foundation, Inc.
3 This file is part of the GNU C Library.
5 The GNU C Library is free software; you can redistribute it and/or
6 modify it under the terms of the GNU Lesser General Public
7 License as published by the Free Software Foundation; either
8 version 2.1 of the License, or (at your option) any later version.
10 The GNU C Library is distributed in the hope that it will be useful,
11 but WITHOUT ANY WARRANTY; without even the implied warranty of
12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
13 Lesser General Public License for more details.
15 You should have received a copy of the GNU Lesser General Public
16 License along with the GNU C Library; if not, write to the Free
17 Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
20 #include <fpu_control.h>
23 #define FPCR_DYN_SHIFT 58 /* first dynamic rounding mode bit */
24 #define FPCR_DYN_CHOPPED (0x0UL << FPCR_DYN_SHIFT) /* towards 0 */
25 #define FPCR_DYN_MINUS (0x1UL << FPCR_DYN_SHIFT) /* towards -INF */
26 #define FPCR_DYN_NORMAL (0x2UL << FPCR_DYN_SHIFT) /* towards nearest */
27 #define FPCR_DYN_PLUS (0x3UL << FPCR_DYN_SHIFT) /* towards +INF */
28 #define FPCR_DYN_MASK (0x3UL << FPCR_DYN_SHIFT)
30 static inline unsigned long
34 asm ("excb; mf_fpcr %0" : "=f"(fpcr
));
39 wrfpcr (unsigned long fpcr
)
41 asm volatile ("mt_fpcr %0; excb" : : "f"(fpcr
));
46 __setfpucw (fpu_control_t fpu_control
)
51 fpu_control
= _FPU_DEFAULT
;
53 /* first, set dynamic rounding mode: */
56 fpcr
&= ~FPCR_DYN_MASK
;
57 switch (fpu_control
& 0xc00)
59 case _FPU_RC_NEAREST
: fpcr
|= FPCR_DYN_NORMAL
; break;
60 case _FPU_RC_DOWN
: fpcr
|= FPCR_DYN_MINUS
; break;
61 case _FPU_RC_UP
: fpcr
|= FPCR_DYN_PLUS
; break;
62 case _FPU_RC_ZERO
: fpcr
|= FPCR_DYN_CHOPPED
; break;
68 __fpu_control
= fpu_control
; /* update global copy */