diff options
Diffstat (limited to 'sysdeps/i386/fpu/e_acos.S')
| -rw-r--r-- | sysdeps/i386/fpu/e_acos.S | 21 |
1 files changed, 21 insertions, 0 deletions
diff --git a/sysdeps/i386/fpu/e_acos.S b/sysdeps/i386/fpu/e_acos.S new file mode 100644 index 0000000000..b9d07b1091 --- /dev/null +++ b/sysdeps/i386/fpu/e_acos.S @@ -0,0 +1,21 @@ +/* + * Written by J.T. Conklin <jtc@netbsd.org>. + * Public domain. + */ + +#include <machine/asm.h> + +RCSID("$NetBSD: e_acos.S,v 1.4 1995/05/08 23:44:37 jtc Exp $") + +/* acos = atan (sqrt(1 - x^2) / x) */ +ENTRY(__ieee754_acos) + fldl 4(%esp) /* x */ + fld %st /* x : x */ + fmul %st(0) /* x^2 : x */ + fld1 /* 1 : x^2 : x */ + fsubp /* 1 - x^2 : x */ + fsqrt /* sqrt (1 - x^2) : x */ + fxch %st(1) /* x : sqrt (1 - x^2) */ + fpatan /* atan (sqrt(1 - x^2) / x) */ + ret +END (__ieee754_acos) |