| /** |
| * This file has no copyright assigned and is placed in the Public Domain. |
| * This file is part of the mingw-w64 runtime package. |
| * No warranty is given; refer to the file DISCLAIMER.PD within this package. |
| */ |
| /* |
| * Written by J.T. Conklin <jtc@netbsd.org>. |
| * Public domain. |
| */ |
| |
| #include <math.h> |
| |
| float |
| acosf (float x) |
| { |
| float res = 0.0F; |
| |
| /* acosl = atanl (sqrtl(1 - x^2) / x) */ |
| asm volatile ( |
| "fld %%st\n\t" |
| "fmul %%st(0)\n\t" /* x^2 */ |
| "fld1\n\t" |
| "fsubp\n\t" /* 1 - x^2 */ |
| "fsqrt\n\t" /* sqrtl (1 - x^2) */ |
| "fxch %%st(1)\n\t" |
| "fpatan" |
| : "=t" (res) : "0" (x) : "st(1)"); |
| return res; |
| } |
