diff options
Diffstat (limited to 'sysdeps/libm-i387/e_hypot.S')
| -rw-r--r-- | sysdeps/libm-i387/e_hypot.S | 62 |
1 files changed, 62 insertions, 0 deletions
diff --git a/sysdeps/libm-i387/e_hypot.S b/sysdeps/libm-i387/e_hypot.S new file mode 100644 index 0000000000..07a32878a0 --- /dev/null +++ b/sysdeps/libm-i387/e_hypot.S @@ -0,0 +1,62 @@ +/* Compute the hypothenuse of X and Y. + Copyright (C) 1998 Free Software Foundation, Inc. + This file is part of the GNU C Library. + Contributed by Ulrich Drepper <drepper@cygnus.com>, 1998. + + The GNU C Library is free software; you can redistribute it and/or + modify it under the terms of the GNU Library General Public License as + published by the Free Software Foundation; either version 2 of the + License, or (at your option) any later version. + + The GNU C Library is distributed in the hope that it will be useful, + but WITHOUT ANY WARRANTY; without even the implied warranty of + MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU + Library General Public License for more details. + + You should have received a copy of the GNU Library General Public + License along with the GNU C Library; see the file COPYING.LIB. If not, + write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330, + Boston, MA 02111-1307, USA. */ + +#include <sysdep.h> + + .text +ENTRY(__ieee754_hypot) + fldl 4(%esp) // x + fxam + fnstsw + fldl 12(%esp) // y : x + movb %ah, %ch + fxam + fnstsw + movb %ah, %al + orb %ch, %ah + sahf + jc 1f + fmul %st(0) // y * y : x + fxch // x : y * y + fmul %st(0) // x * x : y * y + faddp // x * x + y * y + fsqrt +2: ret + + // We have to test whether any of the parameters is Inf. + // In this case the result is infinity. +1: andb $0x45, %al + cmpb $5, %al + je 3f // jump if y is Inf + andb $0x45, %ch + cmpb $5, %ch + jne 4f // jump if x is not Inf + fxch +3: fstp %st(1) + fabs + jmp 2b + +4: testb $1, %al + jnz 5f // y is NaN + fxch +5: fstp %st(1) + jmp 2b + +END(__ieee754_hypot) |