[PATCH 01/12] Update alignment_for_piecewise_move

[H.J. Lu via Gcc-patches]

alignment_for_piecewise_move is called only with MOVE_MAX_PIECES or
STORE_MAX_PIECES, which are the number of bytes at a time that we
can move or store efficiently.  We should call mode_for_size without
limit to MAX_FIXED_MODE_SIZE, which is an integer expression for the
size in bits of the largest integer machine mode that should actually
be used, may be smaller than MOVE_MAX_PIECES or STORE_MAX_PIECES, which
may use vector.

        * expr.c (alignment_for_piecewise_move): Call mode_for_size
        without limit to MAX_FIXED_MODE_SIZE.
---
 gcc/expr.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/gcc/expr.c b/gcc/expr.c
index e0167b77410..b4c110f8c17 100644
--- a/gcc/expr.c
+++ b/gcc/expr.c
@@ -746,7 +746,7 @@ static unsigned int
 alignment_for_piecewise_move (unsigned int max_pieces, unsigned int align)
 {
   scalar_int_mode tmode
-    = int_mode_for_size (max_pieces * BITS_PER_UNIT, 1).require ();
+    = int_mode_for_size (max_pieces * BITS_PER_UNIT, 0).require ();
 
   if (align >= GET_MODE_ALIGNMENT (tmode))
     align = GET_MODE_ALIGNMENT (tmode);
-- 
2.31.1