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-/* 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_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)