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fpsetround.S revision 1.5 
      1 /*	$NetBSD: fpsetround.S,v 1.5 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(fpsetround, _fpsetround)
     20 ENTRY(_fpsetround)
     21 #else
     22 ENTRY(fpsetround)
     23 #endif
     24 
     25 	fnstcw	-4(%rsp)
     26 	movl	-4(%rsp), %edx
     27 	movl	%edx, %eax
     28 	andl	$0x00000c00, %eax
     29 	andl	$0xfffff3ff, %edx
     30 	orl	%edi, %edx
     31 	movl	%edx, -4(%rsp)
     32 	fldcw	-4(%rsp)
     33 
     34 	stmxcsr	-4(%rsp)
     35 	movl	-4(%rsp), %edx
     36 	andl	$0xffff9fff, %edx
     37 	sall	$3, %edi
     38 	orl	%edi,%edx
     39 	movl	%edx,-4(%rsp)
     40 	ldmxcsr	-4(%rsp)
     41 
     42 	ret
     43 #ifdef WEAK_ALIAS
     44 END(_fpsetround)
     45 #else
     46 END(fpsetround)
     47 #endif
     48