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Add copyright.
(rdfpcr): Use excb rather than trapb. Be more efficient about getting at the fpcr. (wrfpcr): Likewise. (__setfpucw): Reformat.
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Ulrich Drepper
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2521516d30
commit
f97d5b5f4d
@ -1,23 +1,22 @@
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/* FPU control word bits. Alpha version.
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Copyright (C) 1996 Free Software Foundation, Inc.
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Contributed by Olaf Flebbe.
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/* FPU control word bits. Alpha-maped-to-Intel version.
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Copyright (C) 1996 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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Contributed by Olaf Flebbe.
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This file is part of the GNU C Library.
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The GNU C Library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Library General Public License as
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published by the Free Software Foundation; either version 2 of the
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License, or (at your option) any later version.
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The GNU C Library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Library General Public License as
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published by the Free Software Foundation; either version 2 of the
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License, or (at your option) any later version.
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The GNU C Library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Library General Public License for more details.
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The GNU C Library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Library General Public License for more details.
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You should have received a copy of the GNU Library General Public
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License along with the GNU C Library; see the file COPYING.LIB. If
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not, write to the Free Software Foundation, Inc., 675 Mass Ave,
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Cambridge, MA 02139, USA. */
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You should have received a copy of the GNU Library General Public
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License along with the GNU C Library; see the file COPYING.LIB. If not,
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write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
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Boston, MA 02111-1307, USA. */
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#ifndef _ALPHA_FPU_CONTROL_H
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#define _ALPHA_FPU_CONTROL_H
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@ -91,11 +90,12 @@ Cambridge, MA 02139, USA. */
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qualifier. By setting the dynamic rounding mode to +infinity,
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one can use /d to get round to +infinity with no extra overhead
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(so long as the default isn't changed, of course...)
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- exceptions on overflow, zero divide and NaN */
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#define _FPU_DEFAULT 0x1f72
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- no exceptions enabled. */
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#define _FPU_DEFAULT 0x137f
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/* IEEE: same as above, but exceptions */
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#define _FPU_IEEE 0x1f7f
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#define _FPU_IEEE 0x137f
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/* Type of the control word. */
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typedef unsigned int fpu_control_t;
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@ -1,65 +1,78 @@
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#include <fpu_control.h>
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/* Set FP exception mask and rounding mode.
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Copyright (C) 1996, 1997 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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The GNU C Library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Library General Public License as
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published by the Free Software Foundation; either version 2 of the
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License, or (at your option) any later version.
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The GNU C Library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Library General Public License for more details.
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You should have received a copy of the GNU Library General Public
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License along with the GNU C Library; see the file COPYING.LIB. If not,
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write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
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Boston, MA 02111-1307, USA. */
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#include <fpu_control.h>
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#include <asm/fpu.h>
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extern void __ieee_set_fp_control (unsigned long);
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extern unsigned long __ieee_get_fp_control (void);
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static inline unsigned long
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rdfpcr (void)
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{
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unsigned long fpcr;
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asm ("trapb; mf_fpcr $f0; trapb; stt $f0,%0" : "m="(fpcr));
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return fpcr;
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unsigned long fpcr;
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asm ("excb; mf_fpcr %0" : "=f"(fpcr));
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return fpcr;
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}
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static inline void
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wrfpcr (unsigned long fpcr)
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{
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asm volatile ("ldt $f0,%0; trapb; mt_fpcr $f0; trapb" :: "m"(fpcr));
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asm volatile ("mt_fpcr %0; excb" : : "f"(fpcr));
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}
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void
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__setfpucw (unsigned short fpu_control)
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{
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unsigned long fpcr = 0, fpcw = 0;
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unsigned long fpcr = 0, fpcw = 0;
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if (!fpu_control)
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fpu_control = _FPU_DEFAULT;
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if (!fpu_control)
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fpu_control = _FPU_DEFAULT;
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/* first, set dynamic rounding mode: */
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/* first, set dynamic rounding mode: */
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fpcr = rdfpcr();
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fpcr &= ~FPCR_DYN_MASK;
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switch (fpu_control & 0xc00) {
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case _FPU_RC_NEAREST: fpcr |= FPCR_DYN_NORMAL; break;
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case _FPU_RC_DOWN: fpcr |= FPCR_DYN_MINUS; break;
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case _FPU_RC_UP: fpcr |= FPCR_DYN_PLUS; break;
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case _FPU_RC_ZERO: fpcr |= FPCR_DYN_CHOPPED; break;
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fpcr = rdfpcr();
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fpcr &= ~FPCR_DYN_MASK;
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switch (fpu_control & 0xc00)
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{
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case _FPU_RC_NEAREST: fpcr |= FPCR_DYN_NORMAL; break;
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case _FPU_RC_DOWN: fpcr |= FPCR_DYN_MINUS; break;
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case _FPU_RC_UP: fpcr |= FPCR_DYN_PLUS; break;
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case _FPU_RC_ZERO: fpcr |= FPCR_DYN_CHOPPED; break;
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}
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wrfpcr(fpcr);
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wrfpcr(fpcr);
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/* now tell kernel about traps that we like to hear about: */
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/* now tell kernel about traps that we like to hear about: */
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fpcw = __ieee_get_fp_control();
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fpcw &= ~IEEE_TRAP_ENABLE_MASK;
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fpcw = __ieee_get_fp_control();
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fpcw &= ~IEEE_TRAP_ENABLE_MASK;
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if (!(fpu_control & _FPU_MASK_IM))
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fpcw |= IEEE_TRAP_ENABLE_INV;
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if (!(fpu_control & _FPU_MASK_DM))
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fpcw |= IEEE_TRAP_ENABLE_UNF;
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if (!(fpu_control & _FPU_MASK_ZM))
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fpcw |= IEEE_TRAP_ENABLE_DZE;
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if (!(fpu_control & _FPU_MASK_OM))
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fpcw |= IEEE_TRAP_ENABLE_OVF;
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if (!(fpu_control & _FPU_MASK_PM))
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fpcw |= IEEE_TRAP_ENABLE_INE;
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if (!(fpu_control & _FPU_MASK_IM)) fpcw |= IEEE_TRAP_ENABLE_INV;
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if (!(fpu_control & _FPU_MASK_DM)) fpcw |= IEEE_TRAP_ENABLE_UNF;
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if (!(fpu_control & _FPU_MASK_ZM)) fpcw |= IEEE_TRAP_ENABLE_DZE;
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if (!(fpu_control & _FPU_MASK_OM)) fpcw |= IEEE_TRAP_ENABLE_OVF;
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if (!(fpu_control & _FPU_MASK_PM)) fpcw |= IEEE_TRAP_ENABLE_INE;
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__ieee_set_fp_control(fpcw);
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__fpu_control = fpu_control; /* update global copy */
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__fpu_control = fpu_control; /* update global copy */
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__ieee_set_fp_control(fpcw);
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}
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