File: e_acos.S

package info (click to toggle)
glibc 2.28-8
  • links: PTS, VCS
  • area: main
  • in suites: buster
  • size: 271,788 kB
  • sloc: ansic: 1,008,637; asm: 259,607; makefile: 11,271; sh: 10,477; python: 6,910; cpp: 4,992; perl: 2,258; awk: 2,005; yacc: 290; pascal: 182; sed: 73
file content (25 lines) | stat: -rw-r--r-- 613 bytes parent folder | download | duplicates (18)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
/*
 * 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)