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* c++/7542: compiling for powerpc Altivec
@ 2002-08-08 5:16 eyal
0 siblings, 0 replies; 2+ messages in thread
From: eyal @ 2002-08-08 5:16 UTC (permalink / raw)
To: gcc-gnats
>Number: 7542
>Category: c++
>Synopsis: compiling for powerpc Altivec
>Confidential: no
>Severity: critical
>Priority: medium
>Responsible: unassigned
>State: open
>Class: wrong-code
>Submitter-Id: net
>Arrival-Date: Thu Aug 08 05:06:00 PDT 2002
>Closed-Date:
>Last-Modified:
>Originator: eyal@mobileye.com
>Release: gcc-3.1
>Organization:
>Environment:
linux , powerpc
>Description:
I tried to compile Altivec code - and used vec_msum(__vector signed char c1, __vector unsigned char c2, __vector signed int i1) ...
the compiler change this to the assembler code vmsumubm - which uses 2 UNsigned char vectors instead of vmsummbm which uses one SIGNES and one UNSIGND !!
this bug causes the signed operand to be treated as unsigned !!
>How-To-Repeat:
the following compilation:
g++ -S -Wall -pedantic -ansi -Wno-long-long -DNDEBUG -O6 -DALTIVEC -maltivec testZevel.cpp
the g++ version is :
Reading specs from /opt/gcc-3.1/lib/gcc-lib/i686-pc-linux-gnu/3.1/specs
Configured with: ../gcc-3.1/configure --prefix=/opt/gcc-3.1 --enable-shared --enable-threads --enable-languages=c,c++
Thread model: posix
gcc version 3.1
>Fix:
need to be find fast so if you have something please let me know !!!
>Release-Note:
>Audit-Trail:
>Unformatted:
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^ permalink raw reply [flat|nested] 2+ messages in thread
* Re: c++/7542: compiling for powerpc Altivec
@ 2002-09-11 12:03 dje
0 siblings, 0 replies; 2+ messages in thread
From: dje @ 2002-09-11 12:03 UTC (permalink / raw)
To: dje, eyal, gcc-bugs, gcc-prs, nobody
Synopsis: compiling for powerpc Altivec
Responsible-Changed-From-To: unassigned->dje
Responsible-Changed-By: dje
Responsible-Changed-When: Wed Sep 11 12:03:45 2002
Responsible-Changed-Why:
PowerPC
State-Changed-From-To: open->closed
State-Changed-By: dje
State-Changed-When: Wed Sep 11 12:03:45 2002
State-Changed-Why:
Fixed in GCC 3.2
http://gcc.gnu.org/cgi-bin/gnatsweb.pl?cmd=view%20audit-trail&database=gcc&pr=7542
^ permalink raw reply [flat|nested] 2+ messages in thread
end of thread, other threads:[~2002-09-11 19:03 UTC | newest]
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2002-08-08 5:16 c++/7542: compiling for powerpc Altivec eyal
2002-09-11 12:03 dje
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