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[93.103.18.160]) by smtp.gmail.com with ESMTPSA id f24sm4669457edx.90.2020.11.27.02.18.29 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Fri, 27 Nov 2020 02:18:29 -0800 (PST) From: Uros Bizjak To: linux-crypto@vger.kernel.org, x86@kernel.org Cc: Uros Bizjak , Herbert Xu , Borislav Petkov , "H. Peter Anvin" Subject: [PATCH] crypto: x86/poly1305-intel: Use TEST %reg,%reg instead of CMP $0,%reg Date: Fri, 27 Nov 2020 11:18:12 +0100 Message-Id: <20201127101812.72787-1-ubizjak@gmail.com> X-Mailer: git-send-email 2.26.2 MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Precedence: bulk List-ID: X-Mailing-List: linux-crypto@vger.kernel.org CMP $0,%reg can't set overflow flag, so we can use shorter TEST %reg,%reg instruction when only zero and sign flags are checked (E,L,LE,G,GE conditions). Signed-off-by: Uros Bizjak Cc: Herbert Xu Cc: Borislav Petkov Cc: "H. Peter Anvin" --- arch/x86/crypto/poly1305-x86_64-cryptogams.pl | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/arch/x86/crypto/poly1305-x86_64-cryptogams.pl b/arch/x86/crypto/poly1305-x86_64-cryptogams.pl index 7d568012cc15..71fae5a09e56 100644 --- a/arch/x86/crypto/poly1305-x86_64-cryptogams.pl +++ b/arch/x86/crypto/poly1305-x86_64-cryptogams.pl @@ -251,7 +251,7 @@ $code.=<<___; mov %rax,8($ctx) mov %rax,16($ctx) - cmp \$0,$inp + test $inp,$inp je .Lno_key ___ $code.=<<___ if (!$kernel); -- 2.26.2