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crypto: x86/poly1305 - Use TEST %reg,%reg instead of CMP $0,%reg

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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 <ubizjak@gmail.com>
Cc: Herbert Xu <herbert@gondor.apana.org.au>
Cc: Borislav Petkov <bp@alien8.de>
Cc: "H. Peter Anvin" <hpa@zytor.com>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
This commit is contained in:
Uros Bizjak
2020-11-27 11:18:12 +01:00
committed by Herbert Xu
parent 0b837f1ef8
commit be169fe3ce
1 changed files with 1 additions and 1 deletions
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arch/x86/crypto/poly1305-x86_64-cryptogams.pl
+1 -1
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@@ -251,7 +251,7 @@ $code.=<<___;
mov %rax,8($ctx) mov %rax,8($ctx)
mov %rax,16($ctx) mov %rax,16($ctx)
cmp \$0,$inp test $inp,$inp
je .Lno_key je .Lno_key
___ ___
$code.=<<___ if (!$kernel); $code.=<<___ if (!$kernel);