/*      $OpenBSD: fpsetround.S,v 1.3 2018/07/03 23:14:05 mortimer Exp $ */
/*      $NetBSD: fpsetround.S,v 1.3 2002/06/12 19:17:22 fvdl 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
        RETGUARD_SETUP(fpsetround, r11)
        fnstcw  -4(%rsp)
        stmxcsr -8(%rsp)

        andl    $3,%edi

        movl    -4(%rsp),%edx
        rorl    $10,%edx
        movl    %edx,%eax
        andl    $3,%eax

        andl    $~3,%edx
        orl     %edi,%edx
        roll    $10,%edx
        movl    %edx,-4(%rsp)

        movl    -8(%rsp),%edx
        rorl    $13,%edx
        andl    $~3,%edx
        orl     %edi,%edx
        roll    $13,%edx
        movl    %edx,-8(%rsp)

        ldmxcsr -8(%rsp)
        fldcw   -4(%rsp)
        RETGUARD_CHECK(fpsetround, r11)
        ret
#ifdef WEAK_ALIAS
END(_fpsetround)
#else
END(fpsetround)
#endif