The following avoids using exact_log2 on the number of SIMD clone calls
to be emitted when vectorizing calls since that can easily be not
a power of two in which case it will return -1. For different simd
clones the number of calls will differ by a multiply with a power of two
only so using floor_log2 is good enough here.
Bootstrap and regtest running on x86_64-unknown-linux-gnu.
PR tree-optimization/113552
* tree-vect-stmts.cc (vectorizable_simd_clone_call): Use
floor_log2 instead of exact_log2 on the number of calls.
---
gcc/tree-vect-stmts.cc | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/gcc/tree-vect-stmts.cc b/gcc/tree-vect-stmts.cc
index 09749ae3817..1dbe1115da4 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;
if (n->simdclone->inbranch)
this_badness += 8192;
int target_badness = targetm.simd_clone.usable (n);
--
2.35.3
