re PR rtl-optimization/46585 (ICE: SIGSEGV in vinsn_create (sel-sched-ir.c:1189)…

re PR rtl-optimization/46585 (ICE: SIGSEGV in vinsn_create (sel-sched-ir.c:1189) with -fno-dce -fschedule-insns -fselective-scheduling)

	PR rtl-optimization/46585
	* sel-sched-ir.c (return_regset_to_pool): Verify that RS is not NULL.
	(vinsn_init): Skip initialization of dependencies for local NOPs.
	(vinsn_delete): Don't try to free regsets for local NOPs.
        (setup_nop_and_exit_insns): Change definition of nop_pattern.

testsuite:
	* gcc.dg/pr46585.c: New.

From-SVN: r167141

gcc/ChangeLog

 2010-11-25  Alexander Monakov  <amonakov@ispras.ru>
 
+	PR rtl-optimization/46585
+	* sel-sched-ir.c (return_regset_to_pool): Verify that RS is not NULL.
+	(vinsn_init): Skip computation of dependencies for local NOPs.
+	(vinsn_delete): Don't try to free regsets for local NOPs.
+	(setup_nop_and_exit_insns): Change definition of nop_pattern.
+
+2010-11-25  Alexander Monakov  <amonakov@ispras.ru>
+
 	PR rtl-optimization/46602
 	* sel-sched-ir.c (maybe_tidy_empty_bb): Move checking ...
 	(tidy_control_flow): Here.

gcc/sel-sched-ir.c

@@ -942,6 +942,7 @@ get_clear_regset_from_pool (void)
 void
 return_regset_to_pool (regset rs)
 {
+  gcc_assert (rs);
   regset_pool.diff--;
 
   if (regset_pool.n == regset_pool.s)
@@ -1175,6 +1176,9 @@ vinsn_init (vinsn_t vi, insn_t insn, bool force_unique_p)
   VINSN_COUNT (vi) = 0;
   vi->cost = -1;
 
+  if (INSN_NOP_P (insn))
+    return;
+
   if (DF_INSN_UID_SAFE_GET (INSN_UID (insn)) != NULL)
     init_id_from_df (VINSN_ID (vi), insn, force_unique_p);
   else
@@ -1256,9 +1260,12 @@ vinsn_delete (vinsn_t vi)
 {
   gcc_assert (VINSN_COUNT (vi) == 0);
 
-  return_regset_to_pool (VINSN_REG_SETS (vi));
-  return_regset_to_pool (VINSN_REG_USES (vi));
-  return_regset_to_pool (VINSN_REG_CLOBBERS (vi));
+  if (!INSN_NOP_P (VINSN_INSN_RTX (vi)))
+    {
+      return_regset_to_pool (VINSN_REG_SETS (vi));
+      return_regset_to_pool (VINSN_REG_USES (vi));
+      return_regset_to_pool (VINSN_REG_CLOBBERS (vi));
+    }
 
   free (vi);
 }
@@ -5607,7 +5614,7 @@ setup_nop_and_exit_insns (void)
   gcc_assert (nop_pattern == NULL_RTX
 	      && exit_insn == NULL_RTX);
 
-  nop_pattern = gen_nop ();
+  nop_pattern = constm1_rtx;
 
   start_sequence ();
   emit_insn (nop_pattern);

gcc/testsuite/ChangeLog

+2010-11-25  Alexander Monakov  <amonakov@ispras.ru>
+
+	PR rtl-optimization/46585
+	* gcc.dg/pr46585.c: New.
+
 2010-11-24  Richard Henderson  <rth@redhat.com>
 
 	* lib/target-supports.exp (vect_widen_sum_hi_to_si_pattern,

gcc/testsuite/gcc.dg/pr46585.c

+/* { dg-do compile { target powerpc*-*-* ia64-*-* i?86-*-* x86_64-*-* } } */
+/* { dg-options "-fno-dce -fschedule-insns -fselective-scheduling" } */
+void
+foo (void)
+{
+  switch (0)
+    {
+    default:
+      break;
+    }
+}