https://gcc.gnu.org/bugzilla/show_bug.cgi?id=102752
--- Comment #2 from Stefan Schulze Frielinghaus <stefansf at linux dot ibm.com> --- It looks like I missed to take the TREE_TYPE of reduction_var. I just did a quick test with diff --git a/gcc/tree-loop-distribution.c b/gcc/tree-loop-distribution.c index fb9250031b5..0559b9c47d7 100644 --- a/gcc/tree-loop-distribution.c +++ b/gcc/tree-loop-distribution.c @@ -3430,7 +3430,7 @@ generate_strlen_builtin_using_rawmemchr (loop_p loop, tree reduction_var, static bool reduction_var_overflows_first (tree reduction_var, tree load_type) { - widest_int n2 = wi::lshift (1, TYPE_PRECISION (reduction_var));; + widest_int n2 = wi::lshift (1, TYPE_PRECISION (TREE_TYPE (reduction_var)));; widest_int m2 = wi::lshift (1, TYPE_PRECISION (ptrdiff_type_node) - 1); widest_int s = wi::to_widest (TYPE_SIZE_UNIT (load_type)); return wi::ltu_p (n2, wi::udiv_trunc (m2, s)); @@ -3681,7 +3681,7 @@ loop_distribution::transform_reduction_loop (loop_p loop) && ((TYPE_PRECISION (sizetype) >= TYPE_PRECISION (ptr_type_node) - 1 && TYPE_PRECISION (ptr_type_node) >= 32) || (TYPE_OVERFLOW_UNDEFINED (TREE_TYPE (reduction_var)) - && TYPE_PRECISION (reduction_var) <= TYPE_PRECISION (sizetype))) + && TYPE_PRECISION (TREE_TYPE (reduction_var)) <= TYPE_PRECISION (sizetype))) && builtin_decl_implicit (BUILT_IN_STRLEN)) generate_strlen_builtin (loop, reduction_var, load_iv.base, reduction_iv.base, loc); successfully. It's getting late here. I will come back to this tomorrow morning. Sorry for the inconvenience.