resource.h (struct resources): Remove unch_memory member.

	* resource.h (struct resources): Remove unch_memory member.
	(CLEAR_RESOURCE): Don't clear unch_memory.
	* resource.c (mark_referenced_resources): Don't set it.
	(mark_set_resources): Likewise.
	(mark_target_live_regs): Don't clear it.
	(init_resource_info): Likewise.
	* reorg.c (resource_conflicts_p): Don't compare it.
	(redundant_insn): Don't set it.

From-SVN: r198895

gcc/ChangeLog

 2013-05-14  Steven Bosscher  <steven@gcc.gnu.org>
 
+	* resource.h (struct resources): Remove unch_memory member.
+	(CLEAR_RESOURCE): Don't clear unch_memory.
+	* resource.c (mark_referenced_resources): Don't set it.
+	(mark_set_resources): Likewise.
+	(mark_target_live_regs): Don't clear it.
+	(init_resource_info): Likewise.
+	* reorg.c (resource_conflicts_p): Don't compare it.
+	(redundant_insn): Don't set it.
+
 	* rtl.h (next_label, skip_consecutive_labels, link_cc0_insns):
 	Remove prototypes.
 	* emit-rtl.c (next_label): Remove unused function.

gcc/reg-stack.c

@@ -1300,11 +1300,7 @@ compare_for_stack_reg (rtx insn, stack_ptr regstack, rtx pat_src)
 	  /* The 386 can only represent death of the first operand in
 	     the case handled above.  In all other cases, emit a separate
 	     pop and remove the death note from here.  */
-
-	  /* link_cc0_insns (insn); */
-
 	  remove_regno_note (insn, REG_DEAD, REGNO (XEXP (src2_note, 0)));
-
 	  emit_pop_insn (insn, regstack, XEXP (src2_note, 0),
 			 EMIT_AFTER);
 	}

gcc/reorg.c

@@ -314,7 +314,6 @@ static int
 resource_conflicts_p (struct resources *res1, struct resources *res2)
 {
   if ((res1->cc && res2->cc) || (res1->memory && res2->memory)
-      || (res1->unch_memory && res2->unch_memory)
       || res1->volatil || res2->volatil)
     return 1;
 
@@ -1580,7 +1579,6 @@ redundant_insn (rtx insn, rtx target, rtx delay_list)
   /* Insns we pass may not set either NEEDED or SET, so merge them for
      simpler tests.  */
   needed.memory |= set.memory;
-  needed.unch_memory |= set.unch_memory;
   IOR_HARD_REG_SET (needed.regs, set.regs);
 
   /* This insn isn't redundant if it conflicts with an insn that either is

gcc/resource.c

@@ -240,9 +240,7 @@ mark_referenced_resources (rtx x, struct resources *res,
     case MEM:
       /* If this memory shouldn't change, it really isn't referencing
 	 memory.  */
-      if (MEM_READONLY_P (x))
-	res->unch_memory = 1;
-      else
+      if (! MEM_READONLY_P (x))
 	res->memory = 1;
       res->volatil |= MEM_VOLATILE_P (x);
 
@@ -740,7 +738,6 @@ mark_set_resources (rtx x, struct resources *res, int in_dest,
       if (in_dest)
 	{
 	  res->memory = 1;
-	  res->unch_memory |= MEM_READONLY_P (x);
 	  res->volatil |= MEM_VOLATILE_P (x);
 	}
 
@@ -896,7 +893,7 @@ mark_target_live_regs (rtx insns, rtx target, struct resources *res)
 
   /* We have to assume memory is needed, but the CC isn't.  */
   res->memory = 1;
-  res->volatil = res->unch_memory = 0;
+  res->volatil = 0;
   res->cc = 0;
 
   /* See if we have computed this value already.  */
@@ -1145,7 +1142,6 @@ init_resource_info (rtx epilogue_insn)
 
   end_of_function_needs.cc = 0;
   end_of_function_needs.memory = 1;
-  end_of_function_needs.unch_memory = 0;
   CLEAR_HARD_REG_SET (end_of_function_needs.regs);
 
   if (frame_pointer_needed)

gcc/resource.h

@@ -25,14 +25,13 @@ along with GCC; see the file COPYING3.  If not see
 
 /* Macro to clear all resources.  */
 #define CLEAR_RESOURCE(RES)	\
- do { (RES)->memory = (RES)->unch_memory = (RES)->volatil = (RES)->cc = 0; \
+ do { (RES)->memory = (RES)->volatil = (RES)->cc = 0; \
       CLEAR_HARD_REG_SET ((RES)->regs); } while (0)
 
 /* The resources used by a given insn.  */
 struct resources
 {
   char memory;		/* Insn sets or needs a memory location.  */
-  char unch_memory;	/* Insn sets or needs an "unchanging" MEM.  */
   char volatil;		/* Insn sets or needs a volatile memory loc.  */
   char cc;		/* Insn sets or needs the condition codes.  */
   HARD_REG_SET regs;	/* Which registers are set or needed.  */