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acosf.c
/**
 * This file has no copyright assigned and is placed in the Public Domain.
 * This file is part of the w64 mingw-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 (     "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;
}

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