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fpsetround.S revision 1.4 
      1  1.4  christos /*	$NetBSD: fpsetround.S,v 1.4 2011/09/30 17:42:34 christos Exp $	*/
      2  1.1      fvdl 
      3  1.1      fvdl /*
      4  1.3      fvdl  * Written by Frank van der Linden at Wasabi Systems for NetBSD.
      5  1.1      fvdl  * Public domain.
      6  1.1      fvdl  */
      7  1.1      fvdl 
      8  1.1      fvdl #include <machine/asm.h>
      9  1.1      fvdl 
     10  1.3      fvdl /*
     11  1.3      fvdl  * XXX set both the x87 control word and the SSE mxcsr register.
     12  1.3      fvdl  * Applications should only set exception and round flags
     13  1.3      fvdl  * via the fp*() interface, otherwise the status words
     14  1.3      fvdl  * will get our of sync.
     15  1.3      fvdl  */
     16  1.3      fvdl 
     17  1.3      fvdl 
     18  1.2   thorpej #ifdef WEAK_ALIAS
     19  1.2   thorpej WEAK_ALIAS(fpsetround, _fpsetround)
     20  1.2   thorpej ENTRY(_fpsetround)
     21  1.2   thorpej #else
     22  1.1      fvdl ENTRY(fpsetround)
     23  1.2   thorpej #endif
     24  1.4  christos 
     25  1.3      fvdl 	fnstcw	-4(%rsp)
     26  1.4  christos 	movl	-4(%rsp), %edx
     27  1.4  christos 	movl	%edx, %eax
     28  1.4  christos 	andl	$0x00000c00, %eax
     29  1.4  christos 	andl	$0xfffff3ff, %edx
     30  1.4  christos 	orl	%edi, %edx
     31  1.4  christos 	movl	%edx, -4(%rsp)
     32  1.4  christos 	fldcw	-4(%rsp)
     33  1.3      fvdl 
     34  1.4  christos 	stmxcsr	-4(%rsp)
     35  1.4  christos 	movl	-4(%rsp), %edx
     36  1.4  christos 	andl	$0xffff9fff, %edx
     37  1.4  christos 	sall	$3, %edi
     38  1.3      fvdl 	orl	%edi,%edx
     39  1.3      fvdl 	movl	%edx,-4(%rsp)
     40  1.4  christos 	ldmxcsr	-4(%rsp)
     41  1.3      fvdl 
     42  1.1      fvdl 	ret
     43