2001-05-06 17:03:45 +00:00
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/*
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* Public domain.
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*
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*/
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#include <math_private.h>
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2019-07-16 15:17:22 +00:00
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#include <libm-alias-finite.h>
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2001-05-06 17:03:45 +00:00
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long double
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__ieee754_acosl (long double x)
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{
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long double res;
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2012-04-30 18:56:39 +00:00
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/* acosl = atanl (sqrtl((1-x) (1+x)) / x) */
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2001-05-06 17:03:45 +00:00
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asm ( "fld %%st\n"
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"fld1\n"
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2012-04-30 18:56:39 +00:00
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"fsubp\n"
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"fld1\n"
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"fadd %%st(2)\n"
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"fmulp\n" /* 1 - x^2 */
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2001-05-06 17:03:45 +00:00
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"fsqrt\n" /* sqrtl (1 - x^2) */
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2012-04-30 09:38:06 +00:00
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"fabs\n"
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2001-05-06 17:03:45 +00:00
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"fxch %%st(1)\n"
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"fpatan"
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: "=t" (res) : "0" (x) : "st(1)");
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return res;
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}
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2019-07-16 15:17:22 +00:00
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libm_alias_finite (__ieee754_acosl, __acosl)
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