minix/lib/libc/arch/i386/gen/fpsetround.S

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/* $NetBSD: fpsetround.S,v 1.5 2011/09/30 23:45:41 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
* Applications should only set exception and round flags
*/
#ifdef WEAK_ALIAS
WEAK_ALIAS(fpsetround, _fpsetround)
ENTRY(_fpsetround)
#else
ENTRY(fpsetround)
#endif
fnstcw -4(%esp)
movl -4(%esp), %edx
movl %edx, %eax
andl $0x00000c00, %eax
andl $0xfffff3ff, %edx
movl 4(%esp), %ecx
orl %ecx, %edx
movl %edx, -4(%esp)
fldcw -4(%esp)
ret