https://gcc.gnu.org/bugzilla/show_bug.cgi?id=111156
--- Comment #18 from Richard Biener <rguenth at gcc dot gnu.org> ---
diff --git a/gcc/tree-vect-slp.cc b/gcc/tree-vect-slp.cc
index 7cf9504398c..8deeecfd4aa 100644
--- a/gcc/tree-vect-slp.cc
+++ b/gcc/tree-vect-slp.cc
@@ -1280,8 +1280,11 @@ vect_build_slp_tree_1 (vec_info *vinfo, unsigned char
*swap,
&& rhs_code.is_tree_code ()
&& (TREE_CODE_CLASS (tree_code (first_stmt_code))
== tcc_comparison)
- && (swap_tree_comparison (tree_code (first_stmt_code))
- == tree_code (rhs_code)))
+ && ((swap_tree_comparison (tree_code (first_stmt_code))
+ == tree_code (rhs_code))
+ || ((TREE_CODE_CLASS (tree_code (alt_stmt_code))
+ == tcc_comparison)
+ && rhs_code == alt_stmt_code)))
&& !(STMT_VINFO_GROUPED_ACCESS (stmt_info)
&& (first_stmt_code == ARRAY_REF
|| first_stmt_code == BIT_FIELD_REF
should get you SLP but:
t.c:8:26: note: === vect_slp_analyze_operations ===
t.c:8:26: note: ==> examining statement: pretmp_29 = *_28;
t.c:8:26: missed: unsupported load permutation
t.c:10:30: missed: not vectorized: relevant stmt not supported: pretmp_29 =
*_28;
t.c:8:26: note: op template: pretmp_29 = *_28;
t.c:8:26: note: stmt 0 pretmp_29 = *_28;
t.c:8:26: note: stmt 1 pretmp_29 = *_28;
t.c:8:26: note: load permutation { 0 0 }
