[Bug tree-optimization/113552] [11/12/13/14 Regression] vectorizer generates calls to vector math routines with 1 simd lane.

[rguenth at gcc dot gnu.org via Gcc-bugs]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=113552

--- Comment #8 from Richard Biener <rguenth at gcc dot gnu.org> ---
diff --git a/gcc/tree-vect-stmts.cc b/gcc/tree-vect-stmts.cc
index 09749ae3817..1ddbe7a2f6b 100644
--- a/gcc/tree-vect-stmts.cc
+++ b/gcc/tree-vect-stmts.cc
@@ -4071,7 +4071,7 @@ vectorizable_simd_clone_call (vec_info *vinfo,
stmt_vec_info stmt_info,
            || (nargs != simd_nargs))
          continue;
        if (num_calls != 1)
-         this_badness += exact_log2 (num_calls) * 4096;
+         this_badness += floor_log2 (num_calls) * 4096 + num_calls;
        if (n->simdclone->inbranch)
          this_badness += 8192;
        int target_badness = targetm.simd_clone.usable (n);


"fixes" it