| long double acosl (long double x) | |
| { | |
| long double res; | |
| /* acosl = atanl (sqrtl(1 - x^2) / x) */ | |
| asm ( "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; | |
| } |