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Date: Mon, 25 Jul 2011 16:06:44 +0300 (EEST)
From: Dimitrios Apostolou <jimis@gmx.net>
To: Dimitrios Apostolou <jimis@gmx.net>
cc: gcc-patches@gcc.gnu.org, Steven Bosscher <stevenb.gcc@gmail.com>,
	Paolo Bonzini <bonzini@gnu.org>, Jakub Jelinek <jakub@redhat.com>
Subject: Re: [RFC] Replace some bitmaps with HARD_REG_SETs - second version
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Bug found, in df_mark_reg I need to iterate until regno + n, not n. The 
error is at the following hunk:

--- gcc/df-scan.c       2011-02-02 20:08:06 +0000
+++ gcc/df-scan.c       2011-07-24 17:16:46 +0000
@@ -3713,35 +3717,40 @@ df_mark_reg (rtx reg, void *vset)
    if (regno < FIRST_PSEUDO_REGISTER)
      {
        int n = hard_regno_nregs[regno][GET_MODE (reg)];
-      bitmap_set_range (set, regno, n);
+      int i;
+      for (i=regno; i<n; i++)
+       SET_HARD_REG_BIT (*set, i);
      }
    else


Many thanks to monoid from IRC for spotting it! I'll post an updated patch 
soon.

Thanks, 
Dimitris