/*      $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