minix/lib/libc/arch/x86_64/gen/fpsetprec.S
Lionel Sambuc f14fb60209 Libraries updates and cleanup
* Updating common/lib
 * Updating lib/csu
 * Updating lib/libc
 * Updating libexec/ld.elf_so
 * Corrected test on __minix in featuretest to actually follow the
   meaning of the comment.
 * Cleaned up _REENTRANT-related defintions.
 * Disabled -D_REENTRANT for libfetch
 * Removing some unneeded __NBSD_LIBC defines and tests

Change-Id: Ic1394baef74d11b9f86b312f5ff4bbc3cbf72ce2
2013-01-14 11:36:26 +01:00

39 lines
683 B
ArmAsm

/* $NetBSD: fpsetprec.S,v 1.1 2011/03/26 19:51:42 christos Exp $ */
/*
* Written by Frank van der Linden at Wasabi Systems for NetBSD.
* Public domain.
*/
#include <machine/asm.h>
/*
* XXX set both the x87 control word and the SSE mxcsr register.
* Applications should only set exception and round flags
* via the fp*() interface, otherwise the status words
* will get our of sync.
*/
#ifdef WEAK_ALIAS
WEAK_ALIAS(fpsetprec, _fpsetprec)
ENTRY(_fpsetprec)
#else
ENTRY(fpsetprec)
#endif
fnstcw -4(%rsp)
andl $3,%edi
movl -4(%rsp),%edx
rorl $8,%edx
movl %edx,%eax
andl $3,%eax
andl $~3,%edx
orl %edi,%edx
roll $8,%edx
movl %edx,-4(%rsp)
fldcw -4(%rsp)
ret