From 5a64f933655384477d85122c6855dc6d84061810 Mon Sep 17 00:00:00 2001
From: Noah Goldstein <goldstein.w.n@gmail.com>
Date: Wed, 1 Nov 2023 15:30:26 -0500
Subject: [PATCH] x86: Only align destination to 1x VEC_SIZE in memset 4x
 loop

Current code aligns to 2x VEC_SIZE. Aligning to 2x has no affect on
performance other than potentially resulting in an additional
iteration of the loop.
1x maintains aligned stores (the only reason to align in this case)
and doesn't incur any unnecessary loop iterations.
Reviewed-by: Sunil K Pandey <skpgkp2@gmail.com>

(cherry picked from commit 9469261cf1924d350feeec64d2c80cafbbdcdd4d)
---
 sysdeps/x86_64/multiarch/memset-vec-unaligned-erms.S | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/sysdeps/x86_64/multiarch/memset-vec-unaligned-erms.S b/sysdeps/x86_64/multiarch/memset-vec-unaligned-erms.S
index 3d9ad49cb9..0f0636b90f 100644
--- a/sysdeps/x86_64/multiarch/memset-vec-unaligned-erms.S
+++ b/sysdeps/x86_64/multiarch/memset-vec-unaligned-erms.S
@@ -293,7 +293,7 @@ L(more_2x_vec):
 	leaq	(VEC_SIZE * 4)(%rax), %LOOP_REG
 #endif
 	/* Align dst for loop.  */
-	andq	$(VEC_SIZE * -2), %LOOP_REG
+	andq	$(VEC_SIZE * -1), %LOOP_REG
 	.p2align 4
 L(loop):
 	VMOVA	%VMM(0), LOOP_4X_OFFSET(%LOOP_REG)
-- 
2.27.0