-/* FPU control word bits. Alpha version.
-Copyright (C) 1996 Free Software Foundation, Inc.
-Contributed by Olaf Flebbe.
-
-This file is part of the GNU C Library.
-
-The GNU C Library is free software; you can redistribute it and/or
-modify it under the terms of the GNU Library General Public License as
-published by the Free Software Foundation; either version 2 of the
-License, or (at your option) any later version.
-
-The GNU C Library is distributed in the hope that it will be useful,
-but WITHOUT ANY WARRANTY; without even the implied warranty of
-MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
-Library General Public License for more details.
-
-You should have received a copy of the GNU Library General Public
-License along with the GNU C Library; see the file COPYING.LIB. If
-not, write to the Free Software Foundation, Inc., 675 Mass Ave,
-Cambridge, MA 02139, USA. */
+/* FPU control word bits. Alpha-maped-to-Intel version.
+ Copyright (C) 1996 Free Software Foundation, Inc.
+ This file is part of the GNU C Library.
+ Contributed by Olaf Flebbe.
+
+ The GNU C Library is free software; you can redistribute it and/or
+ modify it under the terms of the GNU Library General Public License as
+ published by the Free Software Foundation; either version 2 of the
+ License, or (at your option) any later version.
+
+ The GNU C Library is distributed in the hope that it will be useful,
+ but WITHOUT ANY WARRANTY; without even the implied warranty of
+ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ Library General Public License for more details.
+
+ You should have received a copy of the GNU Library General Public
+ License along with the GNU C Library; see the file COPYING.LIB. If not,
+ write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
+ Boston, MA 02111-1307, USA. */
#ifndef _ALPHA_FPU_CONTROL_H
#define _ALPHA_FPU_CONTROL_H
qualifier. By setting the dynamic rounding mode to +infinity,
one can use /d to get round to +infinity with no extra overhead
(so long as the default isn't changed, of course...)
- - exceptions on overflow, zero divide and NaN */
-#define _FPU_DEFAULT 0x1f72
+ - no exceptions enabled. */
+
+#define _FPU_DEFAULT 0x137f
/* IEEE: same as above, but exceptions */
-#define _FPU_IEEE 0x1f7f
+#define _FPU_IEEE 0x137f
/* Type of the control word. */
typedef unsigned int fpu_control_t;
-#include <fpu_control.h>
+/* Set FP exception mask and rounding mode.
+ Copyright (C) 1996, 1997 Free Software Foundation, Inc.
+ This file is part of the GNU C Library.
+
+ The GNU C Library is free software; you can redistribute it and/or
+ modify it under the terms of the GNU Library General Public License as
+ published by the Free Software Foundation; either version 2 of the
+ License, or (at your option) any later version.
+
+ The GNU C Library is distributed in the hope that it will be useful,
+ but WITHOUT ANY WARRANTY; without even the implied warranty of
+ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ Library General Public License for more details.
+
+ You should have received a copy of the GNU Library General Public
+ License along with the GNU C Library; see the file COPYING.LIB. If not,
+ write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
+ Boston, MA 02111-1307, USA. */
+#include <fpu_control.h>
#include <asm/fpu.h>
+
extern void __ieee_set_fp_control (unsigned long);
extern unsigned long __ieee_get_fp_control (void);
-
static inline unsigned long
rdfpcr (void)
{
- unsigned long fpcr;
-
- asm ("trapb; mf_fpcr $f0; trapb; stt $f0,%0" : "m="(fpcr));
- return fpcr;
+ unsigned long fpcr;
+ asm ("excb; mf_fpcr %0" : "=f"(fpcr));
+ return fpcr;
}
static inline void
wrfpcr (unsigned long fpcr)
{
- asm volatile ("ldt $f0,%0; trapb; mt_fpcr $f0; trapb" :: "m"(fpcr));
+ asm volatile ("mt_fpcr %0; excb" : : "f"(fpcr));
}
void
__setfpucw (unsigned short fpu_control)
{
- unsigned long fpcr = 0, fpcw = 0;
+ unsigned long fpcr = 0, fpcw = 0;
- if (!fpu_control)
- fpu_control = _FPU_DEFAULT;
+ if (!fpu_control)
+ fpu_control = _FPU_DEFAULT;
- /* first, set dynamic rounding mode: */
+ /* first, set dynamic rounding mode: */
- fpcr = rdfpcr();
- fpcr &= ~FPCR_DYN_MASK;
- switch (fpu_control & 0xc00) {
- case _FPU_RC_NEAREST: fpcr |= FPCR_DYN_NORMAL; break;
- case _FPU_RC_DOWN: fpcr |= FPCR_DYN_MINUS; break;
- case _FPU_RC_UP: fpcr |= FPCR_DYN_PLUS; break;
- case _FPU_RC_ZERO: fpcr |= FPCR_DYN_CHOPPED; break;
+ fpcr = rdfpcr();
+ fpcr &= ~FPCR_DYN_MASK;
+ switch (fpu_control & 0xc00)
+ {
+ case _FPU_RC_NEAREST: fpcr |= FPCR_DYN_NORMAL; break;
+ case _FPU_RC_DOWN: fpcr |= FPCR_DYN_MINUS; break;
+ case _FPU_RC_UP: fpcr |= FPCR_DYN_PLUS; break;
+ case _FPU_RC_ZERO: fpcr |= FPCR_DYN_CHOPPED; break;
}
- wrfpcr(fpcr);
+ wrfpcr(fpcr);
- /* now tell kernel about traps that we like to hear about: */
+ /* now tell kernel about traps that we like to hear about: */
- fpcw = __ieee_get_fp_control();
- fpcw &= ~IEEE_TRAP_ENABLE_MASK;
+ fpcw = __ieee_get_fp_control();
+ fpcw &= ~IEEE_TRAP_ENABLE_MASK;
- if (!(fpu_control & _FPU_MASK_IM))
- fpcw |= IEEE_TRAP_ENABLE_INV;
- if (!(fpu_control & _FPU_MASK_DM))
- fpcw |= IEEE_TRAP_ENABLE_UNF;
- if (!(fpu_control & _FPU_MASK_ZM))
- fpcw |= IEEE_TRAP_ENABLE_DZE;
- if (!(fpu_control & _FPU_MASK_OM))
- fpcw |= IEEE_TRAP_ENABLE_OVF;
- if (!(fpu_control & _FPU_MASK_PM))
- fpcw |= IEEE_TRAP_ENABLE_INE;
+ if (!(fpu_control & _FPU_MASK_IM)) fpcw |= IEEE_TRAP_ENABLE_INV;
+ if (!(fpu_control & _FPU_MASK_DM)) fpcw |= IEEE_TRAP_ENABLE_UNF;
+ if (!(fpu_control & _FPU_MASK_ZM)) fpcw |= IEEE_TRAP_ENABLE_DZE;
+ if (!(fpu_control & _FPU_MASK_OM)) fpcw |= IEEE_TRAP_ENABLE_OVF;
+ if (!(fpu_control & _FPU_MASK_PM)) fpcw |= IEEE_TRAP_ENABLE_INE;
- __ieee_set_fp_control(fpcw);
+ __fpu_control = fpu_control; /* update global copy */
- __fpu_control = fpu_control; /* update global copy */
+ __ieee_set_fp_control(fpcw);
}