mn10300: Fixes to PARALLEL handling within mn10300_adjust_sched_cost

2014-08-27  David Malcolm  <dmalcolm@redhat.com>

	* gcc/config/mn10300/mn10300.c (is_load_insn): Rename to...
	(set_is_load_p): ...this, updating to work on a SET pattern rather
	than an insn.
	(is_store_insn): Rename to...
	(set_is_store_p): ...this, updating to work on a SET pattern
	rather than an insn.
	(mn10300_adjust_sched_cost): Move call to get_attr_timings from
	top of function to where it is needed.  Rewrite the bogus
	condition that checks for "insn" and "dep" being PARALLEL to
	instead use single_set, introducing locals "insn_set" and
	"dep_set".  Given that we only ever returned "cost" for a non-pair
	of SETs, bail out early if we don't have a pair of SET.
	Rewrite all uses of PATTERN (dep) and PATTERN (insn) to instead
	use the new locals "insn_set" and "dep_set", and update calls to
	is_load_insn and is_store_insn to be calls to set_is_load_p and
	set_is_store_p.

From-SVN: r214582

gcc/ChangeLog

+2014-08-27  David Malcolm  <dmalcolm@redhat.com>
+
+	* gcc/config/mn10300/mn10300.c (is_load_insn): Rename to...
+	(set_is_load_p): ...this, updating to work on a SET pattern rather
+	than an insn.
+	(is_store_insn): Rename to...
+	(set_is_store_p): ...this, updating to work on a SET pattern
+	rather than an insn.
+	(mn10300_adjust_sched_cost): Move call to get_attr_timings from
+	top of function to where it is needed.  Rewrite the bogus
+	condition that checks for "insn" and "dep" being PARALLEL to
+	instead use single_set, introducing locals "insn_set" and
+	"dep_set".  Given that we only ever returned "cost" for a non-pair
+	of SETs, bail out early if we don't have a pair of SET.
+	Rewrite all uses of PATTERN (dep) and PATTERN (insn) to instead
+	use the new locals "insn_set" and "dep_set", and update calls to
+	is_load_insn and is_store_insn to be calls to set_is_load_p and
+	set_is_store_p.
+
 2014-08-27  Guozhi Wei  <carrot@google.com>
 
 	PR target/62262

gcc/config/mn10300/mn10300.c

@@ -2742,21 +2742,15 @@ mn10300_select_cc_mode (enum rtx_code code, rtx x, rtx y ATTRIBUTE_UNUSED)
 }
 
 static inline bool
-is_load_insn (rtx insn)
+set_is_load_p (rtx set)
 {
-  if (GET_CODE (PATTERN (insn)) != SET)
-    return false;
-
-  return MEM_P (SET_SRC (PATTERN (insn)));
+  return MEM_P (SET_SRC (set));
 }
 
 static inline bool
-is_store_insn (rtx insn)
+set_is_store_p (rtx set)
 {
-  if (GET_CODE (PATTERN (insn)) != SET)
-    return false;
-
-  return MEM_P (SET_DEST (PATTERN (insn)));
+  return MEM_P (SET_DEST (set));
 }
 
 /* Update scheduling costs for situations that cannot be
@@ -2768,33 +2762,36 @@ is_store_insn (rtx insn)
 static int
 mn10300_adjust_sched_cost (rtx insn, rtx link, rtx dep, int cost)
 {
-  int timings = get_attr_timings (insn);
+  rtx insn_set;
+  rtx dep_set;
+  int timings;
 
   if (!TARGET_AM33)
     return 1;
 
-  if (GET_CODE (insn) == PARALLEL)
-    insn = XVECEXP (insn, 0, 0);
+  /* We are only interested in pairs of SET. */
+  insn_set = single_set (insn);
+  if (!insn_set)
+    return cost;
 
-  if (GET_CODE (dep) == PARALLEL)
-    dep = XVECEXP (dep, 0, 0);
+  dep_set = single_set (dep);
+  if (!dep_set)
+    return cost;
 
   /* For the AM34 a load instruction that follows a
      store instruction incurs an extra cycle of delay.  */
   if (mn10300_tune_cpu == PROCESSOR_AM34
-      && is_load_insn (dep)
-      && is_store_insn (insn))
+      && set_is_load_p (dep_set)
+      && set_is_store_p (insn_set))
     cost += 1;
 
   /* For the AM34 a non-store, non-branch FPU insn that follows
      another FPU insn incurs a one cycle throughput increase.  */
   else if (mn10300_tune_cpu == PROCESSOR_AM34
-      && ! is_store_insn (insn)
+      && ! set_is_store_p (insn_set)
       && ! JUMP_P (insn)
-      && GET_CODE (PATTERN (dep)) == SET
-      && GET_CODE (PATTERN (insn)) == SET
-      && GET_MODE_CLASS (GET_MODE (SET_SRC (PATTERN (dep)))) == MODE_FLOAT
-      && GET_MODE_CLASS (GET_MODE (SET_SRC (PATTERN (insn)))) == MODE_FLOAT)
+      && GET_MODE_CLASS (GET_MODE (SET_SRC (dep_set))) == MODE_FLOAT
+      && GET_MODE_CLASS (GET_MODE (SET_SRC (insn_set))) == MODE_FLOAT)
     cost += 1;
 
   /*  Resolve the conflict described in section 1-7-4 of
@@ -2816,23 +2813,21 @@ mn10300_adjust_sched_cost (rtx insn, rtx link, rtx dep, int cost)
     return cost;
 
   /* Check that the instruction about to scheduled is an FPU instruction.  */
-  if (GET_CODE (PATTERN (dep)) != SET)
-    return cost;
-
-  if (GET_MODE_CLASS (GET_MODE (SET_SRC (PATTERN (dep)))) != MODE_FLOAT)
+  if (GET_MODE_CLASS (GET_MODE (SET_SRC (dep_set))) != MODE_FLOAT)
     return cost;
 
   /* Now check to see if the previous instruction is a load or store.  */
-  if (! is_load_insn (insn) && ! is_store_insn (insn))
+  if (! set_is_load_p (insn_set) && ! set_is_store_p (insn_set))
     return cost;
 
   /* XXX: Verify: The text of 1-7-4 implies that the restriction
      only applies when an INTEGER load/store precedes an FPU
      instruction, but is this true ?  For now we assume that it is.  */
-  if (GET_MODE_CLASS (GET_MODE (SET_SRC (PATTERN (insn)))) != MODE_INT)
+  if (GET_MODE_CLASS (GET_MODE (SET_SRC (insn_set))) != MODE_INT)
     return cost;
 
   /* Extract the latency value from the timings attribute.  */
+  timings = get_attr_timings (insn);
   return timings < 100 ? (timings % 10) : (timings % 100);
 }