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c++/1482: va_start generates call to memcpy
- To: gcc-gnats at gcc dot gnu dot org
- Subject: c++/1482: va_start generates call to memcpy
- From: andyj at mc dot com
- Date: 20 Dec 2000 22:07:35 -0000
- Reply-To: andyj at mc dot com
>Number: 1482
>Category: c++
>Synopsis: va_start generates call to memcpy
>Confidential: no
>Severity: serious
>Priority: high
>Responsible: unassigned
>State: open
>Class: sw-bug
>Submitter-Id: net
>Arrival-Date: Wed Dec 20 14:16:00 PST 2000
>Closed-Date:
>Last-Modified:
>Originator: E. Andrew Johnson
>Release: g++-2.95.2
>Organization:
>Environment:
target=powerpc with Altivec 2.95.2 patches
>Description:
The expansion of va_start includes a call to _builtin_memcpy. When compiling with the gcc-2.95.2 C compiler, this generates the inline expansion of the code. When compiling with the gcc-2.95.2 C++ compiler, it generates an external call to memcpy. The problem is that the type.align for "va_list ap" is set to 1, whereas it is
set to 8 (1 byte) in C. Why does it behave differently
with the C++ compiler?
>How-To-Repeat:
gcc -O2 -c tstdarg.ippc
>Fix:
>Release-Note:
>Audit-Trail:
>Unformatted: