re PR rtl-optimization/87759 (ICE in lra_assign, at lra-assigns.c:1624, or ICE:…

re PR rtl-optimization/87759 (ICE in lra_assign, at lra-assigns.c:1624, or ICE: Maximum number of LRA assignment passes is achieved (30), or compile-time hog)

2018-12-18  Vladimir Makarov  <vmakarov@redhat.com>

	PR rtl-optimization/87759
	* lra-assigns.c (lra_split_hard_reg_for): Recalculate
	non_reload_pseudos.

2018-12-18  Vladimir Makarov  <vmakarov@redhat.com>

	PR rtl-optimization/87759
	* gcc.target/i386/pr87759.c: New.

From-SVN: r267244

gcc/ChangeLog

+2018-12-18  Vladimir Makarov  <vmakarov@redhat.com>
+
+	PR rtl-optimization/87759
+	* lra-assigns.c (lra_split_hard_reg_for): Recalculate
+	non_reload_pseudos.
+
 2018-12-18  Jakub Jelinek  <jakub@redhat.com>
 
 	PR target/88464

gcc/lra-assigns.c

@@ -1758,6 +1758,10 @@ lra_split_hard_reg_for (void)
 	     "\n****** Splitting a hard reg after assignment #%d: ******\n\n",
 	     lra_assignment_iter);
   bitmap_initialize (&failed_reload_pseudos, &reg_obstack);
+  bitmap_initialize (&non_reload_pseudos, &reg_obstack);
+  bitmap_ior (&non_reload_pseudos, &lra_inheritance_pseudos, &lra_split_regs);
+  bitmap_ior_into (&non_reload_pseudos, &lra_subreg_reload_pseudos);
+  bitmap_ior_into (&non_reload_pseudos, &lra_optional_reload_pseudos);
   for (i = lra_constraint_new_regno_start; i < max_regno; i++)
     if (reg_renumber[i] < 0 && lra_reg_info[i].nrefs != 0
 	&& (rclass = lra_get_allocno_class (i)) != NO_REGS
@@ -1772,6 +1776,7 @@ lra_split_hard_reg_for (void)
 	  }
 	bitmap_set_bit (&failed_reload_pseudos, i);
       }
+  bitmap_clear (&non_reload_pseudos);
   bitmap_initialize (&failed_reload_insns, &reg_obstack);
   EXECUTE_IF_SET_IN_BITMAP (&failed_reload_pseudos, 0, u, bi)
     {

gcc/testsuite/ChangeLog

+2018-12-18  Vladimir Makarov  <vmakarov@redhat.com>
+
+	PR rtl-optimization/87759
+	* gcc.target/i386/pr87759.c: New.
+
 2018-12-18  Jakub Jelinek  <jakub@redhat.com>
 
 	PR target/88464

gcc/testsuite/gcc.target/i386/pr87759.c

+/* PR rtl-optimization/87759 */
+/* { dg-do compile } */
+/* { dg-options "-O2 -w -fschedule-insns -fselective-scheduling -ftrapv -fno-dce -fno-expensive-optimizations -fno-ipa-ra -fno-tree-dce -fno-tree-ter" } */
+
+int cc;
+
+void
+rc (__int128 *oi)
+{
+  __int128 qz = (__int128)2 << cc;
+
+  if (qz != 0)
+    {
+      if (cc != 0)
+        {
+          __int128 zp = 1;
+
+          for (;;)
+            {
+              unsigned __int128 *ar = &cc;
+              int y5;
+
+              if (oi != 0)
+                {
+ y3:
+                  zp = *oi + *ar;
+                }
+
+              y5 = (cc + 1) == ((*ar /= *oi) << ((zp >>= 128) / cc));
+              qz += !!y5 ? 1 : qz == (*ar ^ zp + 1);
+              ++*oi;
+            }
+        }
+      else
+        ++qz;
+    }
+
+  goto y3;
+}