VN has checking code with gcc_unreachable (), the following makes
it cheaper by instead guarding the side-effect with flag_checking.
Bootstrapped and tested on x86_64-unknown-linux-gnu, pushed.
2022-07-01 Richard Biener <rguent...@suse.de>
* tree-ssa-sccvn.cc (vn_nary_op_insert_into): Make
checking dominance check conditional on flag_checking.
---
gcc/tree-ssa-sccvn.cc | 5 +++--
1 file changed, 3 insertions(+), 2 deletions(-)
diff --git a/gcc/tree-ssa-sccvn.cc b/gcc/tree-ssa-sccvn.cc
index 76d92895a3a..c40c45ed840 100644
--- a/gcc/tree-ssa-sccvn.cc
+++ b/gcc/tree-ssa-sccvn.cc
@@ -4243,9 +4243,10 @@ vn_nary_op_insert_into (vn_nary_op_t vno,
vn_nary_op_table_type *table)
if (dominated_by_p (CDI_DOMINATORS, vno_bb, val_bb))
/* Value registered with more generic predicate. */
return *slot;
- else if (dominated_by_p (CDI_DOMINATORS, val_bb, vno_bb))
+ else if (flag_checking)
/* Shouldn't happen, we insert in RPO order. */
- gcc_unreachable ();
+ gcc_assert (!dominated_by_p (CDI_DOMINATORS,
+ val_bb, vno_bb));
}
/* Append value. */
*next = (vn_pval *) obstack_alloc (&vn_tables_obstack,
--
2.35.3
