* sysdeps/alpha/fpu/fraiseexcpt.c: Remove file. * sysdeps/unix/sysv/linux/kernel-features.h (__ASSUME_IEEE_RAISE_EXCEPTION): New. * sysdeps/unix/sysv/linux/alpha/fraiseexcpt.c: New file. * sysdeps/unix/sysv/linux/alpha/kernel_sysinfo.h: New file. * sysdeps/unix/sysv/linux/alpha/ieee_get_fp_control.S: Use it. * sysdeps/unix/sysv/linux/alpha/ieee_set_fp_control.S: Likewise.

	* sysdeps/alpha/fpu/fraiseexcpt.c: Remove file.
	* sysdeps/unix/sysv/linux/kernel-features.h
	(__ASSUME_IEEE_RAISE_EXCEPTION): New.
	* sysdeps/unix/sysv/linux/alpha/fraiseexcpt.c: New file.
	* sysdeps/unix/sysv/linux/alpha/kernel_sysinfo.h: New file.
	* sysdeps/unix/sysv/linux/alpha/ieee_get_fp_control.S: Use it.
	* sysdeps/unix/sysv/linux/alpha/ieee_set_fp_control.S: Likewise.

2004-09-05  Richard Henderson  <rth@redhat.com>

6 files changed, 108 insertions, 52 deletions

diff --git a/sysdeps/alpha/fpu/fraiseexcpt.c b/sysdeps/alpha/fpu/fraiseexcpt.c
deleted file mode 100644
index 7a589e4598..0000000000
--- a/sysdeps/alpha/fpu/fraiseexcpt.c
+++ /dev/null
@@ -1,48 +0,0 @@
-/* Raise given exceptions.
-   Copyright (C) 1997,98,99,2000,01,02 Free Software Foundation, Inc.
-   This file is part of the GNU C Library.
-   Contributed by Richard Henderson <rth@tamu.edu>, 1997.
-
-   The GNU C Library is free software; you can redistribute it and/or
-   modify it under the terms of the GNU Lesser General Public
-   License as published by the Free Software Foundation; either
-   version 2.1 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
-   Lesser General Public License for more details.
-
-   You should have received a copy of the GNU Lesser General Public
-   License along with the GNU C Library; if not, write to the Free
-   Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
-   02111-1307 USA.  */
-
-#include <fenv_libc.h>
-
-int
-__feraiseexcept (int excepts)
-{
-  unsigned long int tmp;
-
-  /* Get the current exception state.  */
-  tmp = __ieee_get_fp_control ();
-
-  /* Set all the bits that were called for.  */
-  tmp |= (excepts & SWCR_STATUS_MASK);
-
-  /* And store it back.  */
-  __ieee_set_fp_control (tmp);
-
-  /* Success.  */
-  return 0;
-}
-
-#include <shlib-compat.h>
-#if SHLIB_COMPAT (libm, GLIBC_2_1, GLIBC_2_2)
-strong_alias (__feraiseexcept, __old_feraiseexcept)
-compat_symbol (libm, __old_feraiseexcept, feraiseexcept, GLIBC_2_1);
-#endif
-
-libm_hidden_ver (__feraiseexcept, feraiseexcept)
-versioned_symbol (libm, __feraiseexcept, feraiseexcept, GLIBC_2_2);
diff --git a/sysdeps/unix/sysv/linux/alpha/fraiseexcpt.c b/sysdeps/unix/sysv/linux/alpha/fraiseexcpt.c
new file mode 100644
index 0000000000..07f055886e
--- /dev/null
+++ b/sysdeps/unix/sysv/linux/alpha/fraiseexcpt.c
@@ -0,0 +1,92 @@
+/* Copyright (C) 2004 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 Lesser General Public
+   License as published by the Free Software Foundation; either
+   version 2.1 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
+   Lesser General Public License for more details.
+
+   You should have received a copy of the GNU Lesser General Public
+   License along with the GNU C Library; if not, write to the Free
+   Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
+   02111-1307 USA.  */
+
+#include <fenv_libc.h>
+#include <sysdep.h>
+#include <float.h>
+#include "kernel-features.h"
+#include "kernel_sysinfo.h"
+
+
+int
+__feraiseexcept (int excepts)
+{
+  INTERNAL_SYSCALL_DECL (err);
+  unsigned long t = excepts;
+  long r;
+
+  r = INTERNAL_SYSCALL (osf_setsysinfo, err, 2, SSI_IEEE_RAISE_EXCEPTION, &t);
+
+#ifndef __ASSUME_IEEE_RAISE_EXCEPTION
+  if (!INTERNAL_SYSCALL_ERROR_P (r, err))
+    return 0;
+
+  double d;
+
+  /* If we got an error from SSI_IEEE_RAISE_EXCEPTION, assume it means that
+     the system call isn't actually implemented.  Do the best we can.  */
+
+  /* Invalid implemented with 0 / 0 -> NaN.  */
+  if (excepts & FE_INVALID)
+    __asm__ __volatile__ ("divs/su $f31,$f31,%0; trapb" : "=f"(d) : );
+
+  /* Division By Zero implemented with 1 / 0 -> NaN.  */
+  if (excepts & FE_DIVBYZERO)
+    __asm__ __volatile__ ("divs/su %1,$f31,%0; trapb" : "=&f"(d) : "f"(1.0f));
+
+  /* Overflow and underflow cannot be had all by themselves.  We can
+     generate them with arithmetic, but we always get INEXACT raised
+     at the same time.  Prepare to undo.  */
+  if ((excepts & (FE_OVERFLOW | FE_UNDERFLOW)) && !(excepts & FE_INEXACT))
+    INTERNAL_SYSCALL (osf_getsysinfo, err, 2, GSI_IEEE_FP_CONTROL, &t);
+
+  /* Overflow implemented with FLT_MAX + FLT_MAX -> Inf.  */
+  if (excepts & FE_OVERFLOW)
+    __asm__ __volatile__ ("adds/sui %1,%1,%0; trapb"
+			  : "=&f"(d) : "f"(FLT_MAX));
+
+  /* Underflow implemented with FLT_MIN * FLT_MIN -> 0.  */
+  if (excepts & FE_UNDERFLOW)
+    __asm__ __volatile__ ("muls/sui %1,%1,%0; trapb"
+			  : "=&f"(d) : "f"(FLT_MIN));
+
+  /* Inexact implemented with (long)0.5 -> 0.  */
+  if ((excepts & (FE_OVERFLOW | FE_UNDERFLOW | FE_INEXACT)) == FE_INEXACT)
+    __asm__ __volatile__ ("cvttq/svi %1,%0; trapb" : "=&f"(d) : "f"(0.5f));
+
+  /* If we raised inexact when not asked, and inexact was not previously
+     raised, then clear that exception.  */
+  if ((excepts & (FE_OVERFLOW | FE_UNDERFLOW))
+      && !((excepts | t) & FE_INEXACT))
+    {
+      t |= excepts & SWCR_STATUS_MASK;
+      INTERNAL_SYSCALL (osf_setsysinfo, err, 2, SSI_IEEE_FP_CONTROL, &t);
+    }
+#endif /* !__ASSUME_IEEE_RAISE_EXCEPTION */
+
+  return 0;
+}
+
+#include <shlib-compat.h>
+#if SHLIB_COMPAT (libm, GLIBC_2_1, GLIBC_2_2)
+strong_alias (__feraiseexcept, __old_feraiseexcept)
+compat_symbol (libm, __old_feraiseexcept, feraiseexcept, GLIBC_2_1);
+#endif
+
+libm_hidden_ver (__feraiseexcept, feraiseexcept)
+versioned_symbol (libm, __feraiseexcept, feraiseexcept, GLIBC_2_2);
diff --git a/sysdeps/unix/sysv/linux/alpha/ieee_get_fp_control.S b/sysdeps/unix/sysv/linux/alpha/ieee_get_fp_control.S
index 3cabd0b489..4779f175e5 100644
--- a/sysdeps/unix/sysv/linux/alpha/ieee_get_fp_control.S
+++ b/sysdeps/unix/sysv/linux/alpha/ieee_get_fp_control.S
@@ -1,4 +1,4 @@
-/* Copyright (C) 1993, 1995, 1996, 2003 Free Software Foundation, Inc.
+/* Copyright (C) 1993, 1995, 1996, 2003, 2004 Free Software Foundation, Inc.
    This file is part of the GNU C Library.
    Contributed by David Mosberger <davidm@azstarnet.com>, 1995.
 
@@ -18,8 +18,8 @@
    02111-1307 USA.  */
 
 #include <sysdep.h>
+#include "kernel_sysinfo.h"
 
-#define GSI_IEEE_FP_CONTROL	45
 
 	.text
 
diff --git a/sysdeps/unix/sysv/linux/alpha/ieee_set_fp_control.S b/sysdeps/unix/sysv/linux/alpha/ieee_set_fp_control.S
index 302ed06cd3..a9c0891aae 100644
--- a/sysdeps/unix/sysv/linux/alpha/ieee_set_fp_control.S
+++ b/sysdeps/unix/sysv/linux/alpha/ieee_set_fp_control.S
@@ -1,4 +1,5 @@
-/* Copyright (C) 1993, 1995, 1996, 1997, 2003 Free Software Foundation, Inc.
+/* Copyright (C) 1993, 1995, 1996, 1997, 2003, 2004
+   Free Software Foundation, Inc.
    This file is part of the GNU C Library.
    Contributed by David Mosberger <davidm@azstarnet.com>, 1995.
 
@@ -18,8 +19,8 @@
    02111-1307 USA.  */
 
 #include <sysdep.h>
+#include "kernel_sysinfo.h"
 
-#define SSI_IEEE_FP_CONTROL	14
 
 LEAF(__ieee_set_fp_control, 16)
 #ifdef PROF
diff --git a/sysdeps/unix/sysv/linux/alpha/kernel_sysinfo.h b/sysdeps/unix/sysv/linux/alpha/kernel_sysinfo.h
new file mode 100644
index 0000000000..a3edec2269
--- /dev/null
+++ b/sysdeps/unix/sysv/linux/alpha/kernel_sysinfo.h
@@ -0,0 +1,6 @@
+/* A copy of the couple of bits we need from <asm/sysinfo.h>.  */
+
+#define GSI_IEEE_FP_CONTROL		45
+
+#define SSI_IEEE_FP_CONTROL		14
+#define SSI_IEEE_RAISE_EXCEPTION	1001
diff --git a/sysdeps/unix/sysv/linux/kernel-features.h b/sysdeps/unix/sysv/linux/kernel-features.h
index 2a84f1502a..d08c91c2f7 100644
--- a/sysdeps/unix/sysv/linux/kernel-features.h
+++ b/sysdeps/unix/sysv/linux/kernel-features.h
@@ -411,3 +411,8 @@
 #if __LINUX_KERNEL_VERSION >=  0x020609
 # define __ASSUME_WAITID_SYSCALL	1
 #endif
+
+/* Starting with version 2.6.9, SSI_IEEE_RAISE_EXCEPTION exists.  */
+#if __LINUX_KERNEL_VERSION >= 0x020609 && defined __alpha__
+#define __ASSUME_IEEE_RAISE_EXCEPTION	1
+#endif