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flt_rounds.S revision 1.6 
      1  1.6  christos /*	$NetBSD: flt_rounds.S,v 1.6 2011/09/30 17:42:34 christos Exp $	*/
      2  1.1      fvdl 
      3  1.4  christos #include <machine/asm.h>
      4  1.4  christos 
      5  1.1      fvdl /*
      6  1.4  christos  * 00 0 round to zero
      7  1.4  christos  * 01 1 round to nearest
      8  1.4  christos  * 10 2 round to positive infinity
      9  1.4  christos  * 11 3 round to negative infinity
     10  1.1      fvdl  */
     11  1.1      fvdl 	.text
     12  1.1      fvdl 	_ALIGN_TEXT
     13  1.1      fvdl ENTRY(__flt_rounds)
     14  1.4  christos 	fnstcw	-4(%rsp)
     15  1.6  christos 	movl	-4(%rsp), %ecx
     16  1.6  christos 	shrl	$9, %ecx
     17  1.6  christos 	andl	$6, %ecx
     18  1.6  christos 	movl	$0x2d, %eax	/* 0x2d = 00.10.11.01 */
     19  1.6  christos 	sarl	%cl, %eax	/* 0,1,2,3 -> 1,3,2,0 */
     20  1.5  christos 	andl	$3, %eax
     21  1.1      fvdl 	ret
     22