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fpsetprec.S revision 1.2 
      1 /*	$NetBSD: fpsetprec.S,v 1.2 2014/05/22 15:01:56 uebayasi Exp $	*/
      2 
      3 /*
      4  * Written by Frank van der Linden at Wasabi Systems for NetBSD.
      5  * Public domain.
      6  */
      7 
      8 #include <machine/asm.h>
      9 
     10 /*
     11  * XXX set both the x87 control word and the SSE mxcsr register.
     12  * Applications should only set exception and round flags
     13  * via the fp*() interface, otherwise the status words
     14  * will get our of sync.
     15  */
     16 
     17 
     18 #ifdef WEAK_ALIAS
     19 WEAK_ALIAS(fpsetprec, _fpsetprec)
     20 ENTRY(_fpsetprec)
     21 #else
     22 ENTRY(fpsetprec)
     23 #endif
     24 	fnstcw	-4(%rsp)
     25 
     26 	andl	$3,%edi
     27 
     28 	movl	-4(%rsp),%edx
     29 	rorl	$8,%edx
     30 	movl	%edx,%eax
     31 	andl	$3,%eax
     32 
     33 	andl	$~3,%edx
     34 	orl	%edi,%edx
     35 	roll	$8,%edx
     36 	movl	%edx,-4(%rsp)
     37 
     38 	fldcw	-4(%rsp)
     39 	ret
     40 #ifdef WEAK_ALIAS
     41 END(_fpsetprec)
     42 #else
     43 END(fpsetprec)
     44 #endif
     45