Hi, Monk Chiang
I noticed that at -O0, static functions are emitting lpad instructions, whereas
they do not at -O2. I'm not sure if this is expected behavior.
Upon further investigation, I found that c_node->only_called_directly_p()
returns
false, which is caused by force_output being set to 1. Tracing back, I
encountered
the following patch[1] and PR25961[2], which set force_output to 1 for static
functions at -O0, while it is 0 at -O2.
Do you have any comments on this?
Example code:
int cc = 333;
extern int aa;
__attribute__((noinline))
static void
foo(void)
{
cc = aa;
}
int main(void)
{
foo();
return 0;
}
[1] https://gcc.gnu.org/legacy-ml/gcc-patches/2006-05/msg00315.html
[2] https://gcc.gnu.org/bugzilla/show_bug.cgi?id=24561
