Add -fipa-cp-alignment

This patch adds -fipa-cp-alignment to provide a way to enable/disable
alignment discovery and propagation in IPA-CP.

gcc/

	* common.opt (fipa-cp-alignment): New.
	* ipa-cp.c (ipcp_store_alignment_results): Check
	flag_ipa_cp_alignment.
	* opts.c (default_options_table): Enable -fipa-cp-alignment for
	-O2.
	(enable_fdo_optimizations): Set x_flag_ipa_cp_alignment.
	* doc/invoke.texi: Document -fipa-cp-alignment.

gcc/testsuite/

	* gcc.dg/ipa/propalign-3.c: New test.


git-svn-id: svn+ssh://gcc.gnu.org/svn/gcc/trunk@220773 138bc75d-0d04-0410-961f-82ee72b054a4

1 files changed, 9 insertions, 0 deletions

diff --git a/gcc/ipa-cp.c b/gcc/ipa-cp.c
index 440ced4900c..103ac99a6f2 100644
--- a/gcc/ipa-cp.c
+++ b/gcc/ipa-cp.c
@@ -4323,6 +4323,15 @@ ipcp_store_alignment_results (void)
     bool dumped_sth = false;
     bool found_useful_result = false;
 
+    if (!opt_for_fn (node->decl, flag_ipa_cp_alignment))
+      {
+	if (dump_file)
+	  fprintf (dump_file, "Not considering %s for alignment discovery "
+		   "and propagate; -fipa-cp-alignment: disabled.\n",
+		   node->name ());
+	continue;
+      }
+
    if (info->ipcp_orig_node)
       info = IPA_NODE_REF (info->ipcp_orig_node);