When I added the dce_ssa_names argument, I didn't realize bitmap was a
pointer so I used the default argument value as auto_bitmap(). But
instead we could just use nullptr and check if it was a nullptr
before calling simple_dce_from_worklist.
OK? Bootstrapped and tested on x86_64-linux-gnu with no regressions.
gcc/ChangeLog:
* tree-ssa-phiopt.cc (replace_phi_edge_with_variable): Change
the default argument value for dce_ssa_names to nullptr.
Check to make sure dce_ssa_names is a non-nullptr before
calling simple_dce_from_worklist.
---
gcc/tree-ssa-phiopt.cc | 5 +++--
1 file changed, 3 insertions(+), 2 deletions(-)
diff --git a/gcc/tree-ssa-phiopt.cc b/gcc/tree-ssa-phiopt.cc
index 37b98ef3c52..fbc1fd66607 100644
--- a/gcc/tree-ssa-phiopt.cc
+++ b/gcc/tree-ssa-phiopt.cc
@@ -89,7 +89,7 @@ single_non_singleton_phi_for_edges (gimple_seq seq, edge e0,
edge e1)
static void
replace_phi_edge_with_variable (basic_block cond_block,
edge e, gphi *phi, tree new_tree,
- bitmap dce_ssa_names = auto_bitmap())
+ bitmap dce_ssa_names = nullptr)
{
basic_block bb = gimple_bb (phi);
gimple_stmt_iterator gsi;
@@ -164,7 +164,8 @@ replace_phi_edge_with_variable (basic_block cond_block,
gimple_cond_make_true (cond);
}
- simple_dce_from_worklist (dce_ssa_names);
+ if (dce_ssa_names)
+ simple_dce_from_worklist (dce_ssa_names);
statistics_counter_event (cfun, "Replace PHI with variable", 1);
--
2.31.1
