From: H.J. Lu <hjl.tools@gmail.com>
Date: Fri, 30 Apr 2021 11:36:36 +0000 (-0700)
Subject: Update alignment_for_piecewise_move
X-Git-Tag: basepoints/gcc-13~7999
X-Git-Url: http://git.ipfire.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=18d713fbd345c5c54ab6091ac5f114df4551d1bb;p=thirdparty%2Fgcc.git

Update alignment_for_piecewise_move

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.
---

diff --git a/gcc/expr.c b/gcc/expr.c
index e0167b774105..b4c110f8c179 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);