------- Comment #2 from jakub at gcc dot gnu dot org 2010-06-15 11:36 -------
I don't have any wrong-code testcases.
__attribute__((noinline, noclone)) void
f (long x)
{
long a, b, c, d;
asm ("");
__builtin_alloca (1);
}
int
main (void)
{
f (1234567890);
return 0;
}
shows the same issue at -O0 -g as I see on redhat/gcc-4_4-branch on the trunk
between r145138 (which I've backported to 4.4-RH, perhaps I'll need to back it
out) and r146817 (SSA expand). In between those two commits the trunk first
sets DECL_ALIGN to 256 bits on one of the variables (as offset 32 gives and is
still smaller or equal to MAX_SUPPORTED_STACK_ALIGNMENT) and then
expand_stack_var is called on it again and bumps
crtl->stack_alignment_estimated
to 256 (something that isn't really needed).
--
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=44542
