minix/lib/libc/arch/x86_64/gen/fpsetround.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

42 lines
800 B
ArmAsm

/* $NetBSD: fpsetround.S,v 1.4 2011/09/30 17:42:34 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(fpsetround, _fpsetround)
ENTRY(_fpsetround)
#else
ENTRY(fpsetround)
#endif
fnstcw -4(%rsp)
movl -4(%rsp), %edx
movl %edx, %eax
andl $0x00000c00, %eax
andl $0xfffff3ff, %edx
orl %edi, %edx
movl %edx, -4(%rsp)
fldcw -4(%rsp)
stmxcsr -4(%rsp)
movl -4(%rsp), %edx
andl $0xffff9fff, %edx
sall $3, %edi
orl %edi,%edx
movl %edx,-4(%rsp)
ldmxcsr -4(%rsp)
ret