| Message ID | 20201127101812.72787-1-ubizjak@gmail.com |
|---|---|
| State | Accepted |
| Commit | be169fe3cec9efe2bfff98b3f645bca6cc7d09cd |
| Headers | show |
| Series | crypto: x86/poly1305-intel: Use TEST %reg,%reg instead of CMP $0,%reg | expand |
On Fri, Nov 27, 2020 at 11:18:12AM +0100, Uros Bizjak wrote: > 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> > --- > arch/x86/crypto/poly1305-x86_64-cryptogams.pl | 2 +- > 1 file changed, 1 insertion(+), 1 deletion(-) Patch applied. Thanks. -- Email: Herbert Xu <herbert@gondor.apana.org.au> Home Page: http://gondor.apana.org.au/~herbert/ PGP Key: http://gondor.apana.org.au/~herbert/pubkey.txt
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);
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> --- arch/x86/crypto/poly1305-x86_64-cryptogams.pl | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-)