From c2ebccc97190a978a44e341516b488f02a78c598 Mon Sep 17 00:00:00 2001 From: Jan Hubicka Date: Mon, 26 Jun 2023 18:29:39 +0200 Subject: [PATCH] Fix profile of forwarders produced by cd-dce compiling the testcase from PR109849 (which uses std:vector based stack to drive a loop) with profile feedbakc leads to profile mismatches introduced by tree-ssa-dce. This is the new code to produce unified forwarder blocks for PHIs. I am not including the testcase itself since checking it for Invalid sum is probably going to be too fragile and this should show in our LNT testers. The patch however fixes the mismatch. Bootstrapped/regtested x86_64-linux and plan to commit it shortly. gcc/ChangeLog: PR tree-optimization/109849 * tree-ssa-dce.cc (make_forwarders_with_degenerate_phis): Fix profile count of newly constructed forwarder block. --- gcc/tree-ssa-dce.cc | 3 +++ 1 file changed, 3 insertions(+) diff --git a/gcc/tree-ssa-dce.cc b/gcc/tree-ssa-dce.cc index 2949957f883..f0b02456132 100644 --- a/gcc/tree-ssa-dce.cc +++ b/gcc/tree-ssa-dce.cc @@ -1865,12 +1865,15 @@ make_forwarders_with_degenerate_phis (function *fn) } free_dominance_info (fn, CDI_DOMINATORS); basic_block forwarder = split_edge (args[start].first); + profile_count count = profile_count::zero (); for (unsigned j = start + 1; j < i; ++j) { edge e = args[j].first; redirect_edge_and_branch_force (e, forwarder); redirect_edge_var_map_clear (e); + count += e->count (); } + forwarder->count = count; if (vphi) { tree def = copy_ssa_name (vphi_args[0]);