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/*
* Written by J.T. Conklin <jtc@netbsd.org>.
* Public domain.
*/
#include <machine/asm.h>
RCSID("$NetBSD: e_asin.S,v 1.4 1995/05/08 23:45:40 jtc Exp $")
.section .rodata.cst8,"aM",@progbits,8
.p2align 3
.type dbl_min,@object
dbl_min: .byte 0, 0, 0, 0, 0, 0, 0x10, 0
ASM_SIZE_DIRECTIVE(dbl_min)
#ifdef PIC
# define MO(op) op##@GOTOFF(%ecx)
#else
# define MO(op) op
#endif
.text
/* asin = atan (x / sqrt((1-x) (1+x))) */
ENTRY(__ieee754_asin)
#ifdef PIC
LOAD_PIC_REG (cx)
#endif
fldl 4(%esp) /* x */
fld %st
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 */
fsqrt /* sqrt (1 - x^2) */
fpatan
fldl MO(dbl_min)
fld %st(1)
fabs
fucompp
fnstsw
sahf
jnc 1f
subl $8, %esp
cfi_adjust_cfa_offset (8)
fld %st(0)
fmul %st(0)
fstpl (%esp)
addl $8, %esp
cfi_adjust_cfa_offset (-8)
1: ret
END (__ieee754_asin)
strong_alias (__ieee754_asin, __asin_finite)
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