gcc/

	* rtl.h (emit): Add an optional boolean parameter to control
	whether barriers are emitted.
	* emit-rtl.c (emit): Likewise.
	* gensupport.c (get_emit_function): Return null rather than "emit".
	* genemit.c (gen_emit_seq): Handle the null return value.
	Don't emit barriers after the final instruction in the sequence.
	* gentarget-def.c (main): Don't emit barriers after the instruction.


git-svn-id: svn+ssh://gcc.gnu.org/svn/gcc/trunk@225000 138bc75d-0d04-0410-961f-82ee72b054a4

1 files changed, 7 insertions, 3 deletions

diff --git a/gcc/emit-rtl.c b/gcc/emit-rtl.c
index e7f7eab4fe2..80c0adb1a35 100644
--- a/gcc/emit-rtl.c
+++ b/gcc/emit-rtl.c
@@ -5303,11 +5303,14 @@ set_dst_reg_note (rtx insn, enum reg_note kind, rtx datum, rtx dst)
   return NULL_RTX;
 }
 
-/* Emit the rtl pattern X as an appropriate kind of insn.
+/* Emit the rtl pattern X as an appropriate kind of insn.  Also emit a
+   following barrier if the instruction needs one and if ALLOW_BARRIER_P
+   is true.
+
    If X is a label, it is simply added into the insn chain.  */
 
 rtx_insn *
-emit (rtx x)
+emit (rtx x, bool allow_barrier_p)
 {
   enum rtx_code code = classify_insn (x);
 
@@ -5320,7 +5323,8 @@ emit (rtx x)
     case  JUMP_INSN:
       {
 	rtx_insn *insn = emit_jump_insn (x);
-	if (any_uncondjump_p (insn) || GET_CODE (x) == RETURN)
+	if (allow_barrier_p
+	    && (any_uncondjump_p (insn) || GET_CODE (x) == RETURN))
 	  return emit_barrier ();
 	return insn;
       }