Divide REG_LABEL notes into REG_LABEL_OPERAND and REG_LABEL_TARGET.

	* doc/rtl.texi (Insns): Specify when a label_ref makes a jump_insn.
	Similar for what label_refs can go in the JUMP_TARGET field.  Split
	REG_LABEL documentation into REG_LABEL_TARGET and REG_LABEL_OPERAND.
	* reload.c (find_reloads): Generate REG_LABEL_OPERAND, not
	REG_LABEL when replacing an operand with a LABEL_REF for a
	non-jump insn.
	(subst_reloads): When replacing a LABEL_REG with a register,
	instead of generating a REG_LABEL note, assert that there already
	is one or that the label is a known target for the insn.
	* rtlanal.c (computed_jump_p): Instead of looking for a REG_LABEL
	note, check the JUMP_LABEL field.  Remove "else" after return.
	* reorg.c (emit_delay_sequence): Replace case for REG_LABEL with
	cases for REG_LABEL_OPERAND and REG_LABEL_TARGET.
	(fill_slots_from_thread): Handle both REG_LABEL_OPERAND and
	REG_LABEL_TARGET notes, including the JUMP_TARGET field on JUMP_P
	insns.  Iterate over all notes; don't assume there's only one.
	* cse.c (recorded_label_ref): Adjust comment to refer to
	REG_LABEL_OPERAND.
	(cse_extended_basic_block): Do LABEL_REF check for all INSN_P
	insns, not just NONJUMP_INSN_P.
	(check_for_label_ref): For JUMP_P insns, check that the LABEL_REF
	isn't a jump target.
	* jump.c (rebuild_jump_labels): Adjust head comment.
	(init_label_info): Ditto.  Remove REG_LABEL_OPERAND notes only;
	don't reset REG_LABEL_TARGET notes, including the JUMP_LABEL field.
	(mark_all_labels): For JUMP_P insns without a target, check if the
	the target is noted on the previous nonjump insn.
	(mark_jump_label_1): New function, guts from mark_jump_label.
	<case IF_THEN_ELSE>: Handle first operand as a non-target when
	marking jump target labels.
	<case LABEL_REF>: Adjust for whether to generate a
	REG_LABEL_TARGET or a REG_LABEL_OPERAND note.
	For 'E' format rtl, iterate in descending element order.
	(delete_related_insns): Handle both REG_LABEL_TARGET and
	REG_LABEL_OPERAND notes.  For JUMP_P insns with labels with zero
	reference count, delete and fallthrough.  Move finding-next-
	non-deleted insn last in the function.  Look at all INSN_P insns
	for REG_LABEL_OPERAND notes.
	(redirect_jump_2): Assert that OLABEL equals the old JUMP_LABEL of
	JUMP.
	* print-rtl.c (print_rtx): For JUMP_P insns and a non-NULL
	JUMP_LABEL, output the INSN_UID of it.
	* gcse.c: Adjust comments as appropriate to say REG_LABEL_OPERAND
	and/or REG_LABEL_TARGET.
	(add_label_notes): Only add REG_LABEL_OPERAND notes.  Put in line
	with jump.c copy by only adding notes for labels actually
	referenced in the insn.
	* emit-rtl.c (try_split): Don't assume only NONJUMP_INSN_P need
	usage count increment; handle all INSN_P trial insns.
	(emit_copy_of_insn_after): Change to not copy REG_LABEL_OPERAND
	notes.
	* rtl.h (struct rtx_def) <volatil>: Adjust to mention
	REG_LABEL_TARGET and REG_LABEL_OPERAND.
	(LABEL_REF_NONLOCAL_P): Allow REG_LABEL_TARGET and
	REG_LABEL_OPERAND.
	* combine.c (distribute_notes): Adjust for REG_LABEL_TARGET on
	JUMP_P insns and REG_LABEL_OPERAND everywhere.
	* sched-rgn.c (is_cfg_nonregular): Check for REG_LABEL_OPERANDS
	on all INSN_P insns.
	* reg-notes.def (LABEL_TARGET, LABEL_OPERAND): Split from LABEL.
	* cfgrtl.c (delete_insn): Adjust to handle REG_LABEL_TARGET and
	REG_LABEL_OPERAND notes.
	* reload1.c (calculate_needs_all_insns): Adjust comments.
	(set_label_offsets): Adjust to look for REG_LABEL_OPERAND notes.
	* config/alpha/alpha.md (split for load of an address into a
	four-insn sequence on Unicos/Mk): Adjust to use
	REG_LABEL_OPERAND.
	* config/sh/sh.md (sh_reorg, final_prescan_insn): Ditto.


git-svn-id: https://gcc.gnu.org/svn/gcc/trunk@128287 138bc75d-0d04-0410-961f-82ee72b054a4

1 files changed, 19 insertions, 16 deletions

diff --git a/gcc/reload.c b/gcc/reload.c
index 6eb380202e2..e88a82de7c4 100644
--- a/gcc/reload.c
+++ b/gcc/reload.c
@@ -4103,13 +4103,18 @@ find_reloads (rtx insn, int replace, int ind_levels, int live_known,
 
 	  *recog_data.operand_loc[i] = substitution;
 
-	  /* If we're replacing an operand with a LABEL_REF, we need
-	     to make sure that there's a REG_LABEL note attached to
+	  /* If we're replacing an operand with a LABEL_REF, we need to
+	     make sure that there's a REG_LABEL_OPERAND note attached to
 	     this instruction.  */
-	  if (!JUMP_P (insn)
-	      && GET_CODE (substitution) == LABEL_REF
-	      && !find_reg_note (insn, REG_LABEL, XEXP (substitution, 0)))
-	    REG_NOTES (insn) = gen_rtx_INSN_LIST (REG_LABEL,
+	  if (GET_CODE (substitution) == LABEL_REF
+	      && !find_reg_note (insn, REG_LABEL_OPERAND,
+				 XEXP (substitution, 0))
+	      /* For a JUMP_P, if it was a branch target it must have
+		 already been recorded as such.  */
+	      && (!JUMP_P (insn)
+		  || !label_is_jump_target_p (XEXP (substitution, 0),
+					      insn)))
+	    REG_NOTES (insn) = gen_rtx_INSN_LIST (REG_LABEL_OPERAND,
 						  XEXP (substitution, 0),
 						  REG_NOTES (insn));
 	}
@@ -6123,17 +6128,15 @@ subst_reloads (rtx insn)
 	    }
 #endif /* DEBUG_RELOAD */
 
-	  /* If we're replacing a LABEL_REF with a register, add a
-	     REG_LABEL note to indicate to flow which label this
+	  /* If we're replacing a LABEL_REF with a register, there must
+	     already be an indication (to e.g. flow) which label this
 	     register refers to.  */
-	  if (GET_CODE (*r->where) == LABEL_REF
-	      && JUMP_P (insn))
-	    {
-	      REG_NOTES (insn) = gen_rtx_INSN_LIST (REG_LABEL,
-						    XEXP (*r->where, 0),
-						    REG_NOTES (insn));
-	      JUMP_LABEL (insn) = XEXP (*r->where, 0);
-	   }
+	  gcc_assert (GET_CODE (*r->where) != LABEL_REF
+		      || !JUMP_P (insn)
+		      || find_reg_note (insn,
+					REG_LABEL_OPERAND,
+					XEXP (*r->where, 0))
+		      || label_is_jump_target_p (XEXP (*r->where, 0), insn));
 
 	  /* Encapsulate RELOADREG so its machine mode matches what
 	     used to be there.  Note that gen_lowpart_common will