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Fix IEEE negative zero problems

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From-SVN: r20169
This commit is contained in:
Michael Meissner 1998-06-01 09:15:23 +00:00 • committed by Michael Meissner
parent 36f5cda04b
commit 9224220fb3
2 changed files with 13 additions and 2 deletions
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5
gcc/ChangeLog
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@ -1,3 +1,8 @@
Mon Jun 1 12:14:28 1998 Michael Meissner <meissner@cygnus.com>
* config/fp-bit.c (_fp{add,div}_parts): Return correct IEEE result
in the presence of IEEE negative 0's.
Sun May 31 16:11:41 1998 John Wehle (john@feith.com)
* reload.c (find_reloads): Record the existing mode if

10
gcc/config/fp-bit.c
View file

@ -1,7 +1,7 @@
/* This is a software floating point library which can be used instead of
the floating point routines in libgcc1.c for targets without hardware
floating point.
Copyright (C) 1994, 1995, 1996, 1997 Free Software Foundation, Inc.
Copyright (C) 1994, 1995, 1996, 1997, 1998 Free Software Foundation, Inc.
This file is free software; you can redistribute it and/or modify it
under the terms of the GNU General Public License as published by the
@ -663,6 +663,12 @@ _fpadd_parts (fp_number_type * a,
}
if (iszero (b))
{
if (iszero (a))
{
*tmp = *a;
tmp->sign = a->sign & b->sign;
return tmp;
}
return a;
}
if (iszero (a))
@ -1028,7 +1034,7 @@ _fpdiv_parts (fp_number_type * a,
if (iszero (b))
{
a->class = CLASS_INFINITY;
return b;
return a;
}
/* Calculate the mantissa by multiplying both 64bit numbers to get a