https://gcc.gnu.org/bugzilla/show_bug.cgi?id=36010
Ajit Kumar Agarwal <aagarwa at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
CC| |aagarwa at gcc dot gnu.org
--- Comment #5 from Ajit Kumar Agarwal <aagarwa at gcc dot gnu.org> ---
Use the following flags-fassociative-math -fno-signed-zeros -fno-trapping-math
to make loop-interchange work.
Following code in gcc/gimple-loop-interchange.cc
@@ -514,8 +514,8 @@ loop_cand::analyze_iloop_reduction_var (tree var)
if (! (associative_tree_code (code)
|| (code == MINUS_EXPR
&& use_p->use == gimple_assign_rhs1_ptr (ass)))
|| (FLOAT_TYPE_P (TREE_TYPE (var))
&& ! flag_associative_math))
return false;
}
else
Because of the flag_associative_math conditions at line no: 514 it returns
false and loop interchange doesn't work. Using the above flags make
flag_associative_math as true and loop interchange works.
