Update.

	Reported by Christian Gafton.

	* sysdeps/libm-i387/e_hypot.S: New file.
	* sysdeps/libm-i387/e_hypotf.S: New file.

diff --git a/ChangeLog b/ChangeLog
index 756a0a2897f0459aba37b0f47040464c8d9a5fa5..a84062ca5ef678b15455d6fcb6eb8f14ec2e5674 100644 (file)
--- a/ChangeLog
+++ b/ChangeLog
@@ -3,6 +3,10 @@
        * misc/efgcvt_r.c (fcvt_r): Remove code which tries to use libm
        functions.  Reduce error in computing normalized value by multiplying
        factor in loop and compute result in one step.
+       Reported by Christian Gafton.
+
+       * sysdeps/libm-i387/e_hypot.S: New file.
+       * sysdeps/libm-i387/e_hypotf.S: New file.
 
 1998-11-04  Andreas Jaeger  <aj@arthur.rhein-neckar.de> 
  

diff --git a/sysdeps/libm-i387/e_hypot.S b/sysdeps/libm-i387/e_hypot.S
new file mode 100644 (file)
index 0000000..07a3287
--- /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)

diff --git a/sysdeps/libm-i387/e_hypotf.S b/sysdeps/libm-i387/e_hypotf.S
new file mode 100644 (file)
index 0000000..bf5416b
--- /dev/null
+++ b/sysdeps/libm-i387/e_hypotf.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_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)