Sibcalls and exceptions

[Alexandre Oliva]

Mark,

I don't see why this patch:

2001-06-05  Mark Mitchell  <mark@codesourcery.com>

	* toplev.c (main): Disable sibling-call optimization if we are
	handling exceptions.

is necessary.  The following patches, installed long before yours:

2000-11-30  Richard Henderson  <rth@redhat.com>

	* calls.c (expand_call): Emit queued insns before creating
	the tail recursion sequence.

2000-11-21  Richard Henderson  <rth@redhat.com>

	* c-common.c (c_unsafe_for_reeval): New function.
	(add_c_tree_codes): Register it.
	* c-common.h: Declare it.
	* tree.c (lang_unsafe_for_reeval): New hook.
	(unsafe_for_reeval): Call it.
	* tree.h: Declare it.

were enough to fix a testcase I had for an old branch, without
disabling the optimization, and, in fact, they have also fixed the
problem reported in PR2975.  I've just tried reverting your patch, and
I still could compile the testcase in PR2975 without any problems, and
didn't get any regressions on athlon-pc-linux-gnu.  So, is this ok to
install, or is there any other reason I and the testsuite are missing
to keep sibcalls disabled in the presence of exceptions?

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-- 
Alexandre Oliva   Enjoy Guarana', see http://www.ic.unicamp.br/~oliva/
Red Hat GCC Developer                  aoliva@{cygnus.com, redhat.com}
CS PhD student at IC-Unicamp        oliva@{lsd.ic.unicamp.br, gnu.org}
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