[Bug tree-optimization/19431] missed optimization with ifs and deferencing
pinskia at gcc dot gnu dot org
gcc-bugzilla@gcc.gnu.org
Thu Jan 13 21:54:00 GMT 2005
------- Additional Comments From pinskia at gcc dot gnu dot org 2005-01-13 21:54 -------
This comes from "std::_Deque_base<_Tp, _Alloc>::_M_initialize_map" in libstdc++.
Here is the last SSA tree dump:
f (k, i1, j1)
{
int * f1;
int D.1116;
<bb 0>:
if (k_2 != 0) goto <L2>; else goto <L4>;
<L4>:;
# f1_1 = PHI <&i1(0), &j1(1)>;
<L2>:;
# VUSE <i1_7>;
# VUSE <j1_8>;
D.1116_3 = *f1_1;
return D.1116_3;
}
And the .final_cleanup one:
f (k, i1, j1)
{
int * f1;
<bb 0>:
if (k != 0) goto <L5>; else goto <L4>;
<L5>:;
f1 = &i1;
goto <bb 3> (<L2>);
<L4>:;
f1 = &j1;
<L2>:;
return *f1;
}
--
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=19431
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