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From: "stefansf at linux dot ibm.com" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug tree-optimization/102752] [12 Regression] Recent change to
 ldist causing ICE on msp430-elf, rl78-elf, and xstormy16-elf
Date: Thu, 14 Oct 2021 18:07:23 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D102752

--- 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 =3D wi::lshift (1, TYPE_PRECISION (reduction_var));;
+  widest_int n2 =3D wi::lshift (1, TYPE_PRECISION (TREE_TYPE (reduction_va=
r)));;
   widest_int m2 =3D wi::lshift (1, TYPE_PRECISION (ptrdiff_type_node) - 1);
   widest_int s =3D 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 l=
oop)
          && ((TYPE_PRECISION (sizetype) >=3D TYPE_PRECISION (ptr_type_node=
) - 1
               && TYPE_PRECISION (ptr_type_node) >=3D 32)
              || (TYPE_OVERFLOW_UNDEFINED (TREE_TYPE (reduction_var))
-                 && TYPE_PRECISION (reduction_var) <=3D TYPE_PRECISION
(sizetype)))
+                 && TYPE_PRECISION (TREE_TYPE (reduction_var)) <=3D
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.=