| /* 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 Lesser General Public |
| License as published by the Free Software Foundation; either |
| version 2.1 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 |
| Lesser General Public License for more details. |
| |
| You should have received a copy of the GNU Lesser General Public |
| License along with the GNU C Library; 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_hypotf) |
| flds 4(%esp) // x |
| fxam |
| fnstsw |
| flds 8(%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_hypotf) |
