[Bug target/41156] [4.4/4.5 Regression] zlib segfault in inflate_table() compiled w/ -O -msse2 ftree-vectorize

[joseph at codesourcery dot com]

------- Comment #33 from joseph at codesourcery dot com  2010-02-17 17:24 -------
Subject: Re:  [4.4/4.5 Regression] zlib segfault in
 inflate_table() compiled w/ -O -msse2 ftree-vectorize

I believe the ABI *is* that the stack must be 16-byte aligned at function 
boundaries, although this is not documented other than as a statement of 
what GCC does 
<http://groups.google.com/group/ia32-abi/browse_thread/thread/4f9b3e5069943bf1>. 
This does not of course stop smaller alignment being used for particular 
code by private arrangement as long as 16-byte alignment is used when 
calling back into user code (for example, it's fine for glibc to build 
code not using callbacks with smaller alignment, or for the Linux kernel 
to use smaller alignment internally as long as it ensures the full 
alignment for signal frames in userspace processes).


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http://gcc.gnu.org/bugzilla/show_bug.cgi?id=41156