From 8fa47acecc4faca1ea410486de92e3669c65a9ee Mon Sep 17 00:00:00 2001
From: Justine Tunney <jtunney@gmail.com>
Date: Sat, 16 Jan 2021 21:36:55 -0800
Subject: [PATCH] Fix memcpy on sandybridge and ivybridge

This bug impacts folks who purchased Intel chips made in 2011-2012.
We're now using `vxorps` instead of `vpxor` which is great since it
means we do not need to change `X86_HAVE(AVX)` to `X86_HAVE(AVX2)`,
because AVX2 is only available on Haswell and later.

Fixes #16
---
 libc/nexgen32e/memcpy.S | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/libc/nexgen32e/memcpy.S b/libc/nexgen32e/memcpy.S
index 67ef269ce..6b7167d89 100644
--- a/libc/nexgen32e/memcpy.S
+++ b/libc/nexgen32e/memcpy.S
@@ -70,8 +70,8 @@ MemCpy:	.leafprologue
 	cmp	%rcx,%rdx
 	ja	0b
 	vmovdqu	%ymm4,-32(%rdi,%rdx)
-	vpxor	%ymm4,%ymm4,%ymm4
-	vpxor	%ymm3,%ymm3,%ymm3
+	vxorps	%ymm4,%ymm4,%ymm4
+	vxorps	%ymm3,%ymm3,%ymm3
 	jmp	.L0
 .L16r:	cmp	$1024,%rdx
 	jae	.Lerms