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