x86_64/gen/fpsetround.S

1.4.18.1       tls /*	$NetBSD: fpsetround.S,v 1.4.18.1 2014/08/10 06:51:49 tls Exp $	*/
     1.1      fvdl
     1.1      fvdl /*
     1.3      fvdl  * Written by Frank van der Linden at Wasabi Systems for NetBSD.
     1.1      fvdl  * Public domain.
     1.1      fvdl  */
     1.1      fvdl
     1.1      fvdl #include <machine/asm.h>
     1.1      fvdl
     1.3      fvdl /*
     1.3      fvdl  * XXX set both the x87 control word and the SSE mxcsr register.
     1.3      fvdl  * Applications should only set exception and round flags
     1.3      fvdl  * via the fp*() interface, otherwise the status words
     1.3      fvdl  * will get our of sync.
     1.3      fvdl  */
     1.3      fvdl
     1.3      fvdl
     1.2   thorpej #ifdef WEAK_ALIAS
     1.2   thorpej WEAK_ALIAS(fpsetround, _fpsetround)
     1.2   thorpej ENTRY(_fpsetround)
     1.2   thorpej #else
     1.1      fvdl ENTRY(fpsetround)
     1.2   thorpej #endif
     1.4  christos
     1.3      fvdl 	fnstcw	-4(%rsp)
     1.4  christos 	movl	-4(%rsp), %edx
     1.4  christos 	movl	%edx, %eax
     1.4  christos 	andl	$0x00000c00, %eax
     1.4  christos 	andl	$0xfffff3ff, %edx
     1.4  christos 	orl	%edi, %edx
     1.4  christos 	movl	%edx, -4(%rsp)
     1.4  christos 	fldcw	-4(%rsp)
     1.3      fvdl
     1.4  christos 	stmxcsr	-4(%rsp)
     1.4  christos 	movl	-4(%rsp), %edx
     1.4  christos 	andl	$0xffff9fff, %edx
     1.4  christos 	sall	$3, %edi
     1.3      fvdl 	orl	%edi,%edx
     1.3      fvdl 	movl	%edx,-4(%rsp)
     1.4  christos 	ldmxcsr	-4(%rsp)
     1.3      fvdl
     1.1      fvdl 	ret
1.4.18.1       tls #ifdef WEAK_ALIAS
1.4.18.1       tls END(_fpsetround)
1.4.18.1       tls #else
1.4.18.1       tls END(fpsetround)
1.4.18.1       tls #endif