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Diffstat (limited to 'winsup/cygwin/math/acosl.c')
| -rw-r--r-- | winsup/cygwin/math/acosl.c | 22 |
1 files changed, 22 insertions, 0 deletions
diff --git a/winsup/cygwin/math/acosl.c b/winsup/cygwin/math/acosl.c new file mode 100644 index 000000000..511b5def2 --- /dev/null +++ b/winsup/cygwin/math/acosl.c @@ -0,0 +1,22 @@ +/** + * This file has no copyright assigned and is placed in the Public Domain. + * This file is part of the mingw-w64 runtime package. + * No warranty is given; refer to the file DISCLAIMER.PD within this package. + */ +long double acosl (long double x); + +long double acosl (long double x) +{ + long double res = 0.0L; + + /* 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; +} |