(calculate_giv_inc): Handle increment computed by ASHIFT.

From-SVN: r10256

diff --git a/gcc/unroll.c b/gcc/unroll.c
index 083f0ab..c598578 100644 (file)
--- a/gcc/unroll.c
+++ b/gcc/unroll.c
@@ -1412,10 +1412,13 @@ calculate_giv_inc (pattern, src_insn, regno)
         one of the LO_SUM rtx.  */
       if (GET_CODE (increment) == LO_SUM)
        increment = XEXP (increment, 1);
-      else if (GET_CODE (increment) == IOR)
+      else if (GET_CODE (increment) == IOR
+              || GET_CODE (increment) == ASHIFT)
        {
-         /* The rs6000 port loads some constants with IOR.  */
+         /* The rs6000 port loads some constants with IOR.
+            The alpha port loads some constants with ASHIFT.  */
          rtx second_part = XEXP (increment, 1);
+         enum rtx_code code = GET_CODE (increment);
 
          src_insn = PREV_INSN (src_insn);
          increment = SET_SRC (PATTERN (src_insn));
@@ -1426,7 +1429,10 @@ calculate_giv_inc (pattern, src_insn, regno)
              || GET_CODE (increment) != CONST_INT)
            abort ();
 
-         increment = GEN_INT (INTVAL (increment) | INTVAL (second_part));
+         if (code == IOR)
+           increment = GEN_INT (INTVAL (increment) | INTVAL (second_part));
+         else
+           increment = GEN_INT (INTVAL (increment) << INTVAL (second_part));
        }
 
       if (GET_CODE (increment) != CONST_INT)