Fix copyright problems reported by Doug Evans.

[pf3gnuchains/gcc-fork.git] / gcc / loop.c

diff --git a/gcc/loop.c b/gcc/loop.c
index e5ae479..cc09454 100644 (file)
--- a/gcc/loop.c
+++ b/gcc/loop.c
@@ -5578,14 +5578,10 @@ check_insn_for_givs (loop, p, not_every_iteration, maybe_multiple)
        }
     }
 
-#ifndef DONT_REDUCE_ADDR
   /* Look for givs which are memory addresses.  */
-  /* This resulted in worse code on a VAX 8600.  I wonder if it
-     still does.  */
   if (GET_CODE (p) == INSN)
     find_mem_givs (loop, PATTERN (p), p, not_every_iteration,
                   maybe_multiple);
-#endif
 
   /* Update the status of whether giv can derive other givs.  This can
      change when we pass a label or an insn that updates a biv.  */
@@ -6462,6 +6458,9 @@ basic_induction_var (loop, x, mode, dest_reg, p, inc_val, mult_val, location)
        return 0;
 
     case SIGN_EXTEND:
+      /* Ignore this BIV if signed arithmetic overflow is defined.  */
+      if (flag_wrapv)
+       return 0;
       return basic_induction_var (loop, XEXP (x, 0), GET_MODE (XEXP (x, 0)),
                                  dest_reg, p, inc_val, mult_val, location);