From cfbabe10ddaba3f200f58910d49aa041d2abde8c Mon Sep 17 00:00:00 2001 From: Andrew Pinski Date: Mon, 17 Mar 2025 11:28:16 -0700 Subject: [PATCH] SCC-Copy: Add More Debug dumps While debugging a failure, I noticed that SCC copy didn't print out what it was doing, e.g. replacing name1 with name 2. This adds that dump. Bootstrapped and tested on x86_64-linux-gnu. gcc/ChangeLog: * gimple-ssa-sccopy.cc (scc_copy_prop::replace_scc_by_value): Dump what is being replaced with what. Signed-off-by: Andrew Pinski --- gcc/gimple-ssa-sccopy.cc | 10 ++++++++++ 1 file changed, 10 insertions(+) diff --git a/gcc/gimple-ssa-sccopy.cc b/gcc/gimple-ssa-sccopy.cc index 7ffb5718ab6..298feb05571 100644 --- a/gcc/gimple-ssa-sccopy.cc +++ b/gcc/gimple-ssa-sccopy.cc @@ -38,6 +38,7 @@ along with GCC; see the file COPYING3. If not see #include "builtins.h" #include "tree-ssa-dce.h" #include "fold-const.h" +#include "tree-pretty-print.h" /* Strongly connected copy propagation pass. @@ -485,6 +486,15 @@ scc_copy_prop::replace_scc_by_value (vec scc, tree val) for (gimple *stmt : scc) { tree name = gimple_get_lhs (stmt); + if (dump_file && (dump_flags & TDF_DETAILS)) + { + fprintf (dump_file, "Replacing "); + print_generic_expr (dump_file, name); + fprintf (dump_file, " with "); + print_generic_expr (dump_file, val); + fprintf (dump_file, "\n"); + + } replace_uses_by (name, val); bitmap_set_bit (dead_stmts, SSA_NAME_VERSION (name)); }