PR rtl-optimization/37769

	* regmove.c (optimize_reg_copy_2): Update REG_INC note if needed.

git-svn-id: svn+ssh://gcc.gnu.org/svn/gcc/trunk@141354 138bc75d-0d04-0410-961f-82ee72b054a4

diff --git a/gcc/ChangeLog b/gcc/ChangeLog
index ecd9081..1beb0d0 100644 (file)
--- a/gcc/ChangeLog
+++ b/gcc/ChangeLog
@@ -1,5 +1,10 @@
 2008-10-24  Kaz Kojima  <kkojima@gcc.gnu.org>
 
+       PR rtl-optimization/37769
+       * regmove.c (optimize_reg_copy_2): Update REG_INC note if needed.
+
+2008-10-24  Kaz Kojima  <kkojima@gcc.gnu.org>
+
        * config/sh/t-sh: Use $(MULTILIB_CFLAGS) when compiling to
        unwind-dw2-Os-4-200.o.
 

diff --git a/gcc/regmove.c b/gcc/regmove.c
index e25dbec..12b93fc 100644 (file)
--- a/gcc/regmove.c
+++ b/gcc/regmove.c
@@ -685,7 +685,15 @@ optimize_reg_copy_2 (rtx insn, rtx dest, rtx src)
              {
                if (reg_mentioned_p (dest, PATTERN (q)))
                  {
+                   rtx note;
+
                    PATTERN (q) = replace_rtx (PATTERN (q), dest, src);
+                   note = FIND_REG_INC_NOTE (q, dest);
+                   if (note)
+                     {
+                       remove_note (q, note);
+                       add_reg_note (q, REG_INC, src);
+                     }
                    df_insn_rescan (q);
                  }