Add copyright.

(rdfpcr): Use excb rather than trapb.  Be more efficient about
getting at the fpcr.
(wrfpcr): Likewise.
(__setfpucw): Reformat.

diff --git a/sysdeps/alpha/fpu/fpu_control.h b/sysdeps/alpha/fpu/fpu_control.h
index 219ea55..bcf73e8 100644 (file)
--- a/sysdeps/alpha/fpu/fpu_control.h
+++ b/sysdeps/alpha/fpu/fpu_control.h
@@ -1,23 +1,22 @@
-/* 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
@@ -91,11 +90,12 @@ Cambridge, MA 02139, USA.  */
        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;

diff --git a/sysdeps/unix/sysv/linux/alpha/setfpucw.c b/sysdeps/unix/sysv/linux/alpha/setfpucw.c
index 43e8536..9133c81 100644 (file)
--- a/sysdeps/unix/sysv/linux/alpha/setfpucw.c
+++ b/sysdeps/unix/sysv/linux/alpha/setfpucw.c
@@ -1,65 +1,78 @@
-#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);
 }