------- Comment #3 from michael dot meissner at amd dot com 2006-12-04 23:21
-------
I've done some analysis on the test case. The current GCC 4.2 and mainline
branches no longer generate the initial push of %r8, but instead do a subq
$8,%rsp. I believe in the compiler you used it did the push to allocate 8
bytes of stack instead of the subtract. Note, the epilogue still uses a pop to
remove the stack location. The core of the problem is that the compiler is
allocating 8 bytes too much stack in this particular case. I think I
understand whats going on, but I want to dig a bit more.
--
michael dot meissner at amd dot com changed:
What |Removed |Added
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CC| |michael dot meissner at amd
| |dot com
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=25295
