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From 4bfac4471f53c4f74c8d81020beb938f92d84ca5 Mon Sep 17 00:00:00 2001
From: Bernd Edlinger <bernd.edlinger@hotmail.de>
Date: Tue, 22 Aug 2023 16:07:30 +0200
Subject: [PATCH] Avoid clobbering non-volatile XMM registers
This affects some Poly1305 assembler functions
which are only used for certain CPU types.
Remove those functions for Windows targets,
as a simple interim solution.
Fixes #21522
Reviewed-by: Tomas Mraz <tomas@openssl.org>
Reviewed-by: Paul Dale <pauli@openssl.org>
(Merged from https://github.com/openssl/openssl/pull/21808)
(cherry picked from commit 7b8e27bc2e02238986d89ef0ece067ec1b48e165)
---
crypto/poly1305/asm/poly1305-x86_64.pl | 4 ++--
1 file changed, 2 insertions(+), 2 deletions(-)
diff --git a/crypto/poly1305/asm/poly1305-x86_64.pl b/crypto/poly1305/asm/poly1305-x86_64.pl
index fa9bfb7a7b81..24bab9d0bcf9 100755
--- a/crypto/poly1305/asm/poly1305-x86_64.pl
+++ b/crypto/poly1305/asm/poly1305-x86_64.pl
@@ -195,7 +195,7 @@ sub poly1305_iteration {
bt \$`5+32`,%r9 # AVX2?
cmovc %rax,%r10
___
-$code.=<<___ if ($avx>3);
+$code.=<<___ if ($avx>3 && !$win64);
mov \$`(1<<31|1<<21|1<<16)`,%rax
shr \$32,%r9
and %rax,%r9
@@ -2724,7 +2724,7 @@ sub poly1305_iteration {
.cfi_endproc
.size poly1305_blocks_avx512,.-poly1305_blocks_avx512
___
-if ($avx>3) {
+if ($avx>3 && !$win64) {
########################################################################
# VPMADD52 version using 2^44 radix.
#
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