30 lines
552 B
C
30 lines
552 B
C
/*
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* Written by J.T. Conklin <jtc@netbsd.org>.
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* Public domain.
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*
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* Adapted for `long double' by Ulrich Drepper <drepper@cygnus.com>.
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*/
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#include <math_private.h>
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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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/* acosl = atanl (sqrtl((1-x) (1+x)) / x) */
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asm ( "fld %%st\n"
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"fld1\n"
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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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"fsqrt\n" /* sqrtl (1 - x^2) */
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"fabs\n"
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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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strong_alias (__ieee754_acosl, __acosl_finite)
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