forked from KolibriOS/kolibrios
35 lines
615 B
C
35 lines
615 B
C
|
/*
|
||
|
|
* Written by J.T. Conklin <jtc@netbsd.org>.
|
||
|
|
* Public domain.
|
||
|
|
*/
|
||
|
|
|
||
|
|
/* asin = atan (x / sqrt(1 - x^2)) */
|
||
|
|
|
||
|
|
float asinf (float x)
|
||
|
|
{
|
||
|
|
float res;
|
||
|
|
|
||
|
|
asm ( "fld %%st\n\t"
|
||
|
|
"fmul %%st(0)\n\t" /* x^2 */
|
||
|
|
"fld1\n\t"
|
||
|
|
"fsubp\n\t" /* 1 - x^2 */
|
||
|
|
"fsqrt\n\t" /* sqrt (1 - x^2) */
|
||
|
|
"fpatan"
|
||
|
|
: "=t" (res) : "0" (x) : "st(1)");
|
||
|
|
return res;
|
||
|
|
}
|
||
|
|
|
||
|
|
double asin (double x)
|
||
|
|
{
|
||
|
|
double res;
|
||
|
|
|
||
|
|
asm ( "fld %%st\n\t"
|
||
|
|
"fmul %%st(0)\n\t" /* x^2 */
|
||
|
|
"fld1\n\t"
|
||
|
|
"fsubp\n\t" /* 1 - x^2 */
|
||
|
|
"fsqrt\n\t" /* sqrt (1 - x^2) */
|
||
|
|
"fpatan"
|
||
|
|
: "=t" (res) : "0" (x) : "st(1)");
|
||
|
|
return res;
|
||
|
|
}
|