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[pf3gnuchains/pf3gnuchains3x.git] / winsup / mingw / mingwex / math / acosl.c

diff --git a/winsup/mingw/mingwex/math/acosl.c b/winsup/mingw/mingwex/math/acosl.c
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+++ b/winsup/mingw/mingwex/math/acosl.c
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+/*
+ * Written by J.T. Conklin <jtc@netbsd.org>.
+ * Public domain.
+ *
+ * Adapted for `long double' by Ulrich Drepper <drepper@cygnus.com>.
+ */
+
+#include <math.h>
+
+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;
+}