PR93561 -- [bounds checking] memory overflow for spill_for

2020-02-06  <zhongyunde@huawei.com>
  	    Vladimir Makarov  <vmakarov@redhat.com>

	PR rtl-optimization/93561
	* lra-assigns.c (spill_for): Check that tested hard regno is not out of
	hard register range.

gcc/ChangeLog

+2020-02-06  <zhongyunde@huawei.com>
+  	    Vladimir Makarov  <vmakarov@redhat.com>
+
+	PR rtl-optimization/93561
+	* lra-assigns.c (spill_for): Check that tested hard regno is not out of
+	hard register range.
+
 2020-02-06  Richard Sandiford  <richard.sandiford@arm.com>
 
 	* config/aarch64/aarch64.md (aarch64_movk<mode>): Add a type

gcc/lra-assigns.c

@@ -964,6 +964,8 @@ spill_for (int regno, bitmap spilled_pseudo_bitmap, bool first_p)
       bitmap_clear (&spill_pseudos_bitmap);
       for (j = hard_regno_nregs (hard_regno, mode) - 1; j >= 0; j--)
 	{
+          if (hard_regno + j >= FIRST_PSEUDO_REGISTER)
+	    break;
 	  if (try_hard_reg_pseudos_check[hard_regno + j] != curr_pseudo_check)
 	    continue;
 	  lra_assert (!bitmap_empty_p (&try_hard_reg_pseudos[hard_regno + j]));