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authorUlrich Drepper <drepper@redhat.com>2003-07-22 22:28:07 +0000
committerUlrich Drepper <drepper@redhat.com>2003-07-22 22:28:07 +0000
commit11bf8ce1d6c28b4758cedeaea9558f6a071fe7d8 (patch)
tree0f78f99928ebbe5b7abe4619e33eb04fbc95d841 /sysdeps/i386/setfpucw.c
parentf00b19417df4f29fc3264f772c46305f60181cd6 (diff)
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Update.
2003-07-22 H.J. Lu <hongjiu.lu@intel.com> * elf/dl-support.c (_dl_hwcap): New variable. (_dl_aux_init): Initialize GL(dl_hwcap) for static binaries. * sysdeps/i386/fpu/fclrexcpt.c: Include <unistd.h>, <ldsodefs.h> and <dl-procinfo.h>. (__feclearexcept): Clear MXCSR if needed. * sysdeps/i386/fpu/fsetexcptflg.c: Likewise. * sysdeps/i386/fpu_control.h (_FPU_GETCW, _FPU_SETCW): Document that newer hardware needs more than these macros. * sysdeps/i386/setfpucw.c: New file. 2003-07-22 Jakub Jelinek <jakub@redhat.com> * elf/Makefile (CFLAGS-ldconfig.c): Define IS_IN_ldconfig. * elf/ldconfig.c: Include dl-procinfo.c. (PROCINFO_CLASS): Define. * sysdeps/generic/ldsodefs.h (PROCINFO_CLASS): Define. * sysdeps/unix/sysv/linux/x86_64/dl-procinfo.c: New file. * sysdeps/unix/sysv/linux/x86_64/dl-procinfo.h: New file. * sysdeps/unix/sysv/linux/i386/dl-procinfo.c (PROCINFO_CLASS): Define if not yet defined. Use it instead of EXTERN. Undefine at the end of the file. * sysdeps/unix/sysv/linux/arm/dl-procinfo.c (PROCINFO_CLASS): Likewise. * sysdeps/unix/sysv/linux/sparc/sparc32/dl-procinfo.c (PROCINFO_CLASS): Likewise. * sysdeps/unix/sysv/linux/sparc/sparc64/dl-procinfo.c (PROCINFO_CLASS): Likewise. 2003-07-22 H.J. Lu <hongjiu.lu@intel.com> * elf/ldconfig.c (main): Issue a fatal error if relative path is used to build cache. 2003-07-22 Ulrich Drepper <drepper@redhat.com> * elf/readlib.c (process_file): Avoid possible overflow in assignment.
Diffstat (limited to 'sysdeps/i386/setfpucw.c')
-rw-r--r--sysdeps/i386/setfpucw.c55
1 files changed, 55 insertions, 0 deletions
diff --git a/sysdeps/i386/setfpucw.c b/sysdeps/i386/setfpucw.c
new file mode 100644
index 0000000..0a6af25
--- /dev/null
+++ b/sysdeps/i386/setfpucw.c
@@ -0,0 +1,55 @@
+/* Set the FPU control word for x86.
+ Copyright (C) 2003 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 <math.h>
+#include <fpu_control.h>
+#include <fenv.h>
+#include <unistd.h>
+#include <ldsodefs.h>
+#include <dl-procinfo.h>
+
+void
+__setfpucw (fpu_control_t set)
+{
+ fpu_control_t cw;
+
+ /* Fetch the current control word. */
+ __asm__ ("fnstcw %0" : "=m" (*&cw));
+
+ /* Preserve the reserved bits, and set the rest as the user
+ specified (or the default, if the user gave zero). */
+ cw &= _FPU_RESERVED;
+ cw |= set & ~_FPU_RESERVED;
+
+ __asm__ ("fldcw %0" : : "m" (*&cw));
+
+ /* If the CPU supports SSE, we set the MXCSR as well. */
+ if ((GL(dl_hwcap) & HWCAP_I386_XMM) != 0)
+ {
+ unsigned int xnew_exc;
+
+ /* Get the current MXCSR. */
+ __asm__ ("stmxcsr %0" : "=m" (*&xnew_exc));
+
+ xnew_exc &= ~((0xc00 << 3) | (FE_ALL_EXCEPT << 7));
+ xnew_exc |= ((set & 0xc00) << 3) | ((set & FE_ALL_EXCEPT) << 7);
+
+ __asm__ ("ldmxcsr %0" : : "m" (*&xnew_exc));
+ }
+}