[PATCH, i386]: Use ROUND_DOWN some more

[Uros Bizjak]

Hello!

No functional changes.

2015-10-09  Uros Bizjak  <ubiz...@gmail.com>

    * config/i386/i386.c
    (expand_set_or_movmem_prologue_epilogue_by_misaligned_moves): Use
    ROUND_DOWN where applicable.

Bootstrapped and regression tested on x86_64-linux-gnu {,-m32},
committed to mainline SVN:

Uros.

Index: config/i386/i386.c
===================================================================
--- config/i386/i386.c  (revision 228640)
+++ config/i386/i386.c  (working copy)
@@ -25564,7 +25564,8 @@ expand_set_or_movmem_prologue_epilogue_by_misalign
                                    saveddest, *count, 1, OPTAB_DIRECT);
       /* We copied at most size + prolog_size.  */
       if (*min_size > (unsigned HOST_WIDE_INT)(size + prolog_size))
-       *min_size = (*min_size - size) & ~(unsigned HOST_WIDE_INT)(size - 1);
+       *min_size
+         = ROUND_DOWN (*min_size - size, (unsigned HOST_WIDE_INT)size);
       else
        *min_size = 0;
 
@@ -25582,9 +25583,10 @@ expand_set_or_movmem_prologue_epilogue_by_misalign
        *count = expand_simple_binop (GET_MODE (*count), PLUS, *count,
                                      constm1_rtx, *count, 1, OPTAB_DIRECT);
       else
-       *count = GEN_INT ((UINTVAL (*count) - 1) & ~(unsigned 
HOST_WIDE_INT)(size - 1));
+       *count = GEN_INT (ROUND_DOWN (UINTVAL (*count) - 1,
+                                     (unsigned HOST_WIDE_INT)size));
       if (*min_size)
-       *min_size = (*min_size - 1) & ~(unsigned HOST_WIDE_INT)(size - 1);
+       *min_size = ROUND_DOWN (*min_size - 1, (unsigned HOST_WIDE_INT)size);
     }
 }