| 1 | /* |
| 2 | * Public domain. |
| 3 | */ |
| 4 | |
| 5 | #include <machine/asm.h> |
| 6 | #include <i386-math-asm.h> |
| 7 | #include <libm-alias-finite.h> |
| 8 | |
| 9 | RCSID("$NetBSD: e_asin.S,v 1.4 1995/05/08 23:45:40 jtc Exp $" ) |
| 10 | |
| 11 | DEFINE_DBL_MIN |
| 12 | |
| 13 | #ifdef PIC |
| 14 | # define MO(op) op##@GOTOFF(%ecx) |
| 15 | #else |
| 16 | # define MO(op) op |
| 17 | #endif |
| 18 | |
| 19 | .text |
| 20 | |
| 21 | /* asin = atan (x / sqrt((1-x) (1+x))) */ |
| 22 | ENTRY(__ieee754_asin) |
| 23 | #ifdef PIC |
| 24 | LOAD_PIC_REG (cx) |
| 25 | #endif |
| 26 | fldl 4(%esp) /* x */ |
| 27 | fld %st |
| 28 | fld1 /* 1 : x : x */ |
| 29 | fsubp /* 1 - x : x */ |
| 30 | fld1 /* 1 : 1 - x : x */ |
| 31 | fadd %st(2) /* 1 + x : 1 - x : x */ |
| 32 | fmulp /* 1 - x^2 */ |
| 33 | fsqrt /* sqrt (1 - x^2) */ |
| 34 | fpatan |
| 35 | DBL_CHECK_FORCE_UFLOW |
| 36 | ret |
| 37 | END (__ieee754_asin) |
| 38 | libm_alias_finite (__ieee754_asin, __asin) |
| 39 | |