Fix incorrect note handling.

git-svn-id: svn+ssh://gcc.gnu.org/svn/gcc/trunk@43462 138bc75d-0d04-0410-961f-82ee72b054a4

1 files changed, 9 insertions, 0 deletions

diff --git a/gcc/regmove.c b/gcc/regmove.c
index 910c422ee4f..85ca4efaa7d 100644
--- a/gcc/regmove.c
+++ b/gcc/regmove.c
@@ -703,6 +703,9 @@ optimize_reg_copy_3 (insn, dest, src)
 
   if (! (set = single_set (p))
       || GET_CODE (SET_SRC (set)) != MEM
+      /* If there's a REG_EQUIV note, this must be an insn that loads an
+	 argument.  Prefer keeping the note over doing this optimization.  */
+      || find_reg_note (p, REG_EQUIV, NULL_RTX)
       || SET_DEST (set) != src_reg)
     return;
 
@@ -747,6 +750,12 @@ optimize_reg_copy_3 (insn, dest, src)
       PUT_MODE (src_reg, old_mode);
       XEXP (src, 0) = src_reg;
     }
+  else
+    {
+      rtx note = find_reg_note (p, REG_EQUAL, NULL_RTX);
+      if (note)
+	remove_note (p, note);
+    }
 }