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e_exp.S revision 1.3 
      1  1.1  jtc /*
      2  1.3  jtc  * Written by J.T. Conklin <jtc (at) netbsd.org>.
      3  1.3  jtc  * Public domain.
      4  1.1  jtc  */
      5  1.1  jtc 
      6  1.1  jtc #include <machine/asm.h>
      7  1.1  jtc 
      8  1.3  jtc RCSID("$Id: e_exp.S,v 1.3 1995/04/28 22:43:38 jtc Exp $")
      9  1.2  jtc 
     10  1.1  jtc /* e^x = 2^(x * log2(e)) */
     11  1.1  jtc ENTRY(__ieee754_exp)
     12  1.1  jtc 	fldl	4(%esp)
     13  1.1  jtc 	fldl2e
     14  1.1  jtc 	fmulp				/* x * log2(e) */
     15  1.1  jtc 	fstl	%st(1)
     16  1.1  jtc 	frndint				/* int(x * log2(e)) */
     17  1.1  jtc 	fstl	%st(2)
     18  1.1  jtc 	fsubrp				/* fract(x * log2(e)) */
     19  1.1  jtc 	f2xm1				/* 2^(fract(x * log2(e))) - 1 */
     20  1.1  jtc 	fld1
     21  1.1  jtc 	faddp				/* 2^(fract(x * log2(e))) */
     22  1.1  jtc 	fscale				/* e^x */
     23  1.1  jtc 	ret
     24