c++/6144: segment-faults when using sse extensions and ia32 g++

[dylan@q-games.com]

>Number:         6144
>Category:       c++
>Synopsis:       segment-faults when using sse extensions and ia32 g++
>Confidential:   no
>Severity:       serious
>Priority:       medium
>Responsible:    unassigned
>State:          open
>Class:          sw-bug
>Submitter-Id:   net
>Arrival-Date:   Tue Apr 02 17:46:21 PST 2002
>Closed-Date:
>Last-Modified:
>Originator:     Dylan Cuthbert (dylan@q-games.com)
>Release:        3.1 (25th March 2002 snapshot)
>Organization:
>Environment:
cygwin 1.3.9, windows 2000, Athlon MP (2 processor) 1.2Ghz (problem occurs also on Pentium IV machines)
>Description:
A simplified piece of code to demonstrate SSE 16 byte values not being stack-aligned correctly in certain cases.  The main problem appears to be when they are encapsulated in another class (like a matrix) and then referenced individually in an expression.  This makes use of the SSE extensions unreliable and, in effect, unusable so I think the priority should be high.
>How-To-Repeat:
compile and run the attached code on Pentium IV or Athlon 4. MP or XP chipset.
>Fix:
Unknown
>Release-Note:
>Audit-Trail:
>Unformatted: