[PATCH] Fix PR target/103100 -mstrict-align and memset on not aligned buffers

apinski@marvell.com apinski@marvell.com
Sat Nov 6 05:25:25 GMT 2021


From: Andrew Pinski <apinski@marvell.com>

The problem here is with -mstrict-align, aarch64_expand_setmem needs
to check the alginment of the mode to make sure we can use it for
doing the stores.

gcc/ChangeLog:

	PR target/103100
	* config/aarch64/aarch64.c (aarch64_expand_setmem):
	Add check for alignment of the mode if STRICT_ALIGNMENT is true.
---
 gcc/config/aarch64/aarch64.c | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/gcc/config/aarch64/aarch64.c b/gcc/config/aarch64/aarch64.c
index fdf05505846..2c00583e12c 100644
--- a/gcc/config/aarch64/aarch64.c
+++ b/gcc/config/aarch64/aarch64.c
@@ -23738,7 +23738,9 @@ aarch64_expand_setmem (rtx *operands)
 	 over writing.  */
       opt_scalar_int_mode mode_iter;
       FOR_EACH_MODE_IN_CLASS (mode_iter, MODE_INT)
-	if (GET_MODE_BITSIZE (mode_iter.require ()) <= MIN (n, copy_limit))
+	if (GET_MODE_BITSIZE (mode_iter.require ()) <= MIN (n, copy_limit)
+	    && (!STRICT_ALIGNMENT
+		|| MEM_ALIGN (dst) >= GET_MODE_ALIGNMENT (mode_iter.require ())))
 	  cur_mode = mode_iter.require ();
 
       gcc_assert (cur_mode != BLKmode);
-- 
2.17.1



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