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/* $NetBSD: fpsetround.S,v 1.5 2014/05/22 15:01:56 uebayasi 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
#ifdef WEAK_ALIAS
END(_fpsetround)
#else
END(fpsetround)
#endif
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