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author | Richard Henderson <rth@redhat.com> | 2004-09-06 02:19:36 +0000 |
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committer | Richard Henderson <rth@redhat.com> | 2004-09-06 02:19:36 +0000 |
commit | 6029b952a671027cceb9e158ab2e91f7714caf7e (patch) | |
tree | eb917f8458f4e5fb26ff63e755f4d103c70628dc /sysdeps/unix/sysv/linux/alpha/fraiseexcpt.c | |
parent | febcd83655138bcb01b2680e170e6773a1ec813c (diff) | |
download | glibc-6029b952a671027cceb9e158ab2e91f7714caf7e.tar.gz glibc-6029b952a671027cceb9e158ab2e91f7714caf7e.tar.xz glibc-6029b952a671027cceb9e158ab2e91f7714caf7e.zip |
* 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>
Diffstat (limited to 'sysdeps/unix/sysv/linux/alpha/fraiseexcpt.c')
-rw-r--r-- | sysdeps/unix/sysv/linux/alpha/fraiseexcpt.c | 92 |
1 files changed, 92 insertions, 0 deletions
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); |