1/* 2 * Written by J.T. Conklin <jtc@NetBSD.org>. 3 * Public domain. 4 */ 5 6#include <machine/asm.h> 7 8#include "abi.h" 9 10RCSID("$NetBSD: e_acos.S,v 1.8 2003/07/26 19:24:57 salo Exp $") 11 12/* acos = atan (sqrt(1 - x^2) / x) */ 13ENTRY(__ieee754_acos) 14 XMM_ONE_ARG_DOUBLE_PROLOGUE 15 fldl ARG_DOUBLE_ONE /* x */ 16 fld %st(0) 17 fmul %st(0) /* x^2 */ 18 fld1 19 fsubp /* 1 - x^2 */ 20 fsqrt /* sqrt (1 - x^2) */ 21 fxch %st(1) 22 fpatan 23 XMM_DOUBLE_EPILOGUE 24 ret 25