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middle-end/7315: DEC floating point support in real.c is broken
- From: dave at hiauly1 dot hia dot nrc dot ca
- To: gcc-gnats at gcc dot gnu dot org
- Cc: mark at codesourcery dot com
- Date: 15 Jul 2002 19:12:41 -0000
- Subject: middle-end/7315: DEC floating point support in real.c is broken
- Reply-to: dave at hiauly1 dot hia dot nrc dot ca
>Number: 7315
>Category: middle-end
>Synopsis: DEC floating point support in real.c is broken
>Confidential: no
>Severity: serious
>Priority: medium
>Responsible: unassigned
>State: open
>Class: sw-bug
>Submitter-Id: net
>Arrival-Date: Mon Jul 15 12:16:01 PDT 2002
>Closed-Date:
>Last-Modified:
>Originator: Dave Anglin
>Release: 3.1 branch and 3.2
>Organization:
>Environment:
vax-dec-ultrix4.3
>Description:
DEC floating point constants are incorrectly generated by
the current emulator in real.c. For example, the complex
value output for [(float)1, (float)0] in 20020227-1.c
is
.align 2
LC0:
.long 1065353216
.long 0
The correct value for the first long is 16512. It appears
that the IEEE value is being used instead of the DEC value.
>How-To-Repeat:
The problem can be duplicated with a cross compiler
to vax-dec-ultrix4.3.
>Fix:
A proposed fix for the problem on the main is here:
<http://gcc.gnu.org/ml/gcc-patches/2002-06/msg00645.html>.
The best solution for the 3.1 branch may be to revert to not
defining REAL_ARITHMETIC.
>Release-Note:
>Audit-Trail:
>Unformatted: