* cfgrtl.c (emit_insn_at_entry): New function.

	* rtl.h (emit_insn_at_entry): Declare it.
	* integrate.c (emit_initial_value_sets): Use it.



git-svn-id: svn+ssh://gcc.gnu.org/svn/gcc/trunk@116968 138bc75d-0d04-0410-961f-82ee72b054a4

1 files changed, 14 insertions, 0 deletions

diff --git a/gcc/cfgrtl.c b/gcc/cfgrtl.c
index b07bb9467eb..df281cb2d89 100644
--- a/gcc/cfgrtl.c
+++ b/gcc/cfgrtl.c
@@ -453,6 +453,20 @@ entry_of_function (void)
 	  BB_HEAD (ENTRY_BLOCK_PTR->next_bb) : get_insns ());
 }
 
+/* Emit INSN at the entry point of the function, ensuring that it is only
+   executed once per function.  */
+void
+emit_insn_at_entry (rtx insn)
+{
+  edge_iterator ei = ei_start (ENTRY_BLOCK_PTR->succs);
+  edge e = ei_safe_edge (ei);
+  if (!(e->flags & EDGE_FALLTHRU))
+    abort ();
+
+  insert_insn_on_edge (insn, e);
+  commit_edge_insertions ();
+}
+
 /* Update insns block within BB.  */
 
 void