[Bug inline-asm/56621] Misaligned stack with inline assembly

["auc42 at yahoo dot com" <gcc-bugzilla@gcc.gnu.org>]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=56621

--- Comment #2 from auc42 at yahoo dot com 2013-03-14 20:00:56 UTC ---
Ah, I had forgotten to change "tmp" back to a long in the code snippet
provided.  I was experimenting to see variations of the generated assembly
while using different types.  The failure is present with both the 8-byte long
and 4-byte int, in this case.

I accept your explanation about the clobbered registers, though.  I apparently
misunderstood how clobber declarations worked (and in re-reading the manual,
either I'm still missing something or the text isn't very clear).  Placing the
variables directly in the S and d registers and skipping the movX instructions
eliminates the problem.  I suppose that the sequence only worked by
happenstance in earlier versions of gcc.

(As for the reason of doing it this way: the original code was avoiding use of
the C standard library and/or any include files, as a personal learning
exercise toward a later program.)