re PR rtl-optimization/80357 (ICE in model_update_limit_points_in_group, at…

re PR rtl-optimization/80357 (ICE in model_update_limit_points_in_group, at haifa-sched.c:1982 on powerpc64le-linux-gnu)

gcc/
	PR rtl-optimization/80357
	* haifa-sched.c (tmp_bitmap): New variable.
	(model_recompute): Handle duplicate use records.
	(alloc_global_sched_pressure_data): Initialize tmp_bitmap.
	(free_global_sched_pressure_data): Free it.

gcc/testsuite/
	PR rtl-optimization/80357
	* gcc.c-torture/compile/pr80357.c: New test.

From-SVN: r246980

gcc/ChangeLog

+2017-04-18  Richard Sandiford  <richard.sandiford@arm.com>
+
+	PR rtl-optimization/80357
+	* haifa-sched.c (tmp_bitmap): New variable.
+	(model_recompute): Handle duplicate use records.
+	(alloc_global_sched_pressure_data): Initialize tmp_bitmap.
+	(free_global_sched_pressure_data): Free it.
+
 2017-04-18  Bernd Edlinger  <bernd.edlinger@hotmail.de>
 
 	Revert:

gcc/haifa-sched.c

@@ -930,6 +930,9 @@ static bitmap saved_reg_live;
 /* Registers mentioned in the current region.  */
 static bitmap region_ref_regs;
 
+/* Temporary bitmap used for SCHED_PRESSURE_MODEL.  */
+static bitmap tmp_bitmap;
+
 /* Effective number of available registers of a given class (see comment
    in sched_pressure_start_bb).  */
 static int sched_class_regs_num[N_REG_CLASSES];
@@ -2135,10 +2138,11 @@ model_recompute (rtx_insn *insn)
      registers that will be born in the range [model_curr_point, POINT).  */
   num_uses = 0;
   num_pending_births = 0;
+  bitmap_clear (tmp_bitmap);
   for (use = INSN_REG_USE_LIST (insn); use != NULL; use = use->next_insn_use)
     {
       new_last = model_last_use_except (use);
-      if (new_last < point)
+      if (new_last < point && bitmap_set_bit (tmp_bitmap, use->regno))
 	{
 	  gcc_assert (num_uses < ARRAY_SIZE (uses));
 	  uses[num_uses].last_use = new_last;
@@ -7241,6 +7245,8 @@ alloc_global_sched_pressure_data (void)
 	  saved_reg_live = BITMAP_ALLOC (NULL);
 	  region_ref_regs = BITMAP_ALLOC (NULL);
 	}
+      if (sched_pressure == SCHED_PRESSURE_MODEL)
+	tmp_bitmap = BITMAP_ALLOC (NULL);
 
       /* Calculate number of CALL_SAVED_REGS and FIXED_REGS in register classes
 	 that we calculate register pressure for.  */
@@ -7274,6 +7280,8 @@ free_global_sched_pressure_data (void)
 	  BITMAP_FREE (region_ref_regs);
 	  BITMAP_FREE (saved_reg_live);
 	}
+      if (sched_pressure == SCHED_PRESSURE_MODEL)
+	BITMAP_FREE (tmp_bitmap);
       BITMAP_FREE (curr_reg_live);
       free (sched_regno_pressure_class);
     }

gcc/testsuite/ChangeLog

+2017-04-18  Richard Sandiford  <richard.sandiford@arm.com>
+
+	PR rtl-optimization/80357
+	* gcc.c-torture/compile/pr80357.c: New test.
+
 2017-04-18  Jeff Law  <law@redhat.com>
 
 	PR middle-end/80422

gcc/testsuite/gcc.c-torture/compile/pr80357.c

+typedef char a;
+a b, c;
+int d, e;
+void f(void *g) { *(volatile int *)g; }
+void j() {
+  a h, i;
+  for (; b; b += 2) {
+    d = b;
+    i = i >> b;
+    if (i)
+      continue;
+    f(&c + (b >> 2));
+    h = 0;
+    for (; h < 8 / 2; h++)
+      if (i << h)
+        e = 0;
+  }
+}