* unroll.c (unroll_loop): Avoid out-of-bounds index for local_regno.

From-SVN: r25399

diff --git a/gcc/ChangeLog b/gcc/ChangeLog
index ff5706ec15521558ee8ba8a1834771c694d323b5..08591cca4b6826c65bf8827065e315485c48c2ec 100644 (file)
--- a/gcc/ChangeLog
+++ b/gcc/ChangeLog
@@ -1,3 +1,7 @@
+Wed Feb 24 19:17:11 1999  J"orn Rennecke <amylaar@cygnus.co.uk>
+
+       * unroll.c (unroll_loop): Avoid out-of-bounds index for local_regno.
+
 Wed Feb 24 11:26:41 1999  Vladimir N. Makarov  <vmakarov@cygnus.com>
 
        * config/sparc/sparc.h (CONDITIONAL_REGISTER_USAGE): Don't use

diff --git a/gcc/unroll.c b/gcc/unroll.c
index 8737544ae68557b1aa648e84723d7bb29f8e2bff..bf0375761a7e2e154287a43752a2a98a76b20b46 100644 (file)
--- a/gcc/unroll.c
+++ b/gcc/unroll.c
@@ -238,6 +238,7 @@ unroll_loop (loop_end, insn_count, loop_start, end_insert_before,
   struct inline_remap *map;
   char *local_label;
   char *local_regno;
+  int max_local_regnum;
   int maxregnum;
   rtx exit_label = 0;
   rtx start_label;
@@ -755,6 +756,9 @@ unroll_loop (loop_end, insn_count, loop_start, end_insert_before,
   /* The preconditioning code may allocate two new pseudo registers.  */
   maxregnum = max_reg_num ();
 
+  /* local_regno is only valid for regnos < max_local_regnum.  */
+  max_local_regnum = maxregnum;
+
   /* Allocate and zero out the splittable_regs and addr_combined_regs
      arrays.  These must be zeroed here because they will be used if
      loop preconditioning is performed, and must be zero for that case.
@@ -1051,7 +1055,7 @@ unroll_loop (loop_end, insn_count, loop_start, end_insert_before,
                if (local_label[j])
                  set_label_in_map (map, j, gen_label_rtx ());
 
-             for (j = FIRST_PSEUDO_REGISTER; j < maxregnum; j++)
+             for (j = FIRST_PSEUDO_REGISTER; j < max_local_regnum; j++)
                if (local_regno[j])
                  {
                    map->reg_map[j] = gen_reg_rtx (GET_MODE (regno_reg_rtx[j]));
@@ -1199,7 +1203,7 @@ unroll_loop (loop_end, insn_count, loop_start, end_insert_before,
        if (local_label[j])
          set_label_in_map (map, j, gen_label_rtx ());
 
-      for (j = FIRST_PSEUDO_REGISTER; j < maxregnum; j++)
+      for (j = FIRST_PSEUDO_REGISTER; j < max_local_regnum; j++)
        if (local_regno[j])
          {
            map->reg_map[j] = gen_reg_rtx (GET_MODE (regno_reg_rtx[j]));