| /* |
| * Written by J.T. Conklin <jtc@netbsd.org>. |
| * Public domain. |
| */ |
| |
| #include <machine/asm.h> |
| |
| RCSID("$NetBSD: e_acos.S,v 1.4 1995/05/08 23:44:37 jtc Exp $") |
| |
| /* acos = atan (sqrt((1-x) (1+x)) / x) */ |
| ENTRY(__ieee754_acos) |
| fldl 4(%esp) /* x */ |
| fld %st /* x : x */ |
| fld1 /* 1 : x : x */ |
| fsubp /* 1 - x : x */ |
| fld1 /* 1 : 1 - x : x */ |
| fadd %st(2) /* 1 + x : 1 - x : x */ |
| fmulp /* 1 - x^2 : x */ |
| fsqrt /* sqrt (1 - x^2) : x */ |
| fabs |
| fxch %st(1) /* x : sqrt (1 - x^2) */ |
| fpatan /* atan (sqrt(1 - x^2) / x) */ |
| ret |
| END (__ieee754_acos) |
| strong_alias (__ieee754_acos, __acos_finite) |
