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[Bug middle-end/32327] [4.2 Regression] Incorrect stack sharing causing removal of live code
- From: "pinskia at gcc dot gnu dot org" <gcc-bugzilla at gcc dot gnu dot org>
- To: gcc-bugs at gcc dot gnu dot org
- Date: 14 Jun 2007 01:02:47 -0000
- Subject: [Bug middle-end/32327] [4.2 Regression] Incorrect stack sharing causing removal of live code
- References: <bug-32327-91@http.gcc.gnu.org/bugzilla/>
- Reply-to: gcc-bugzilla at gcc dot gnu dot org
------- Comment #16 from pinskia at gcc dot gnu dot org 2007-06-14 01:02 -------
The problem is that it needs also source style scoping also:
take:
int f(int *a);
int g(int b)
{
{
int c;
f(&c);
}
{
int c1;
f(&c1);
}
}
Without source based ones, we don't know if c/c1 can ever be shared.
I have code here at Sony where we actually depend on this behavior with large
structs (and arrays).
--
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=32327