From 9224220fb392bc10bc60e394efc0bdea2c9d515b Mon Sep 17 00:00:00 2001 From: Michael Meissner Date: Mon, 1 Jun 1998 09:15:23 +0000 Subject: [PATCH] Fix IEEE negative zero problems From-SVN: r20169 --- gcc/ChangeLog | 5 +++++ gcc/config/fp-bit.c | 10 ++++++++-- 2 files changed, 13 insertions(+), 2 deletions(-) diff --git a/gcc/ChangeLog b/gcc/ChangeLog index 87f05f9e3b7..fac0310fc38 100644 --- a/gcc/ChangeLog +++ b/gcc/ChangeLog @@ -1,3 +1,8 @@ +Mon Jun 1 12:14:28 1998 Michael Meissner + + * 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 diff --git a/gcc/config/fp-bit.c b/gcc/config/fp-bit.c index 4ff8e028cc7..ca4e0c5ba28 100644 --- a/gcc/config/fp-bit.c +++ b/gcc/config/fp-bit.c @@ -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