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 <ubiz...@gmail.com>
Cc: Herbert Xu <herb...@gondor.apana.org.au>
Cc: Borislav Petkov <b...@alien8.de>
Cc: "H. Peter Anvin" <h...@zytor.com>
---
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
