[PATCH] crypto: x86/sha512-intel: Use TEST %reg,%reg instead of CMP $0,%reg

[Uros Bizjak]

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/sha512-avx-asm.S   | 2 +-
 arch/x86/crypto/sha512-ssse3-asm.S | 2 +-
 2 files changed, 2 insertions(+), 2 deletions(-)

diff --git a/arch/x86/crypto/sha512-avx-asm.S b/arch/x86/crypto/sha512-avx-asm.S
index 63470fd6ae32..684d58c8bc4f 100644
--- a/arch/x86/crypto/sha512-avx-asm.S
+++ b/arch/x86/crypto/sha512-avx-asm.S
@@ -278,7 +278,7 @@ frame_size = frame_GPRSAVE + GPRSAVE_SIZE
 # "blocks" is the message length in SHA512 blocks
 ########################################################################
 SYM_FUNC_START(sha512_transform_avx)
-       cmp $0, msglen
+       test msglen, msglen
        je nowork
 
        # Allocate Stack Space
diff --git a/arch/x86/crypto/sha512-ssse3-asm.S 
b/arch/x86/crypto/sha512-ssse3-asm.S
index 7946a1bee85b..50812af0b083 100644
--- a/arch/x86/crypto/sha512-ssse3-asm.S
+++ b/arch/x86/crypto/sha512-ssse3-asm.S
@@ -280,7 +280,7 @@ frame_size = frame_GPRSAVE + GPRSAVE_SIZE
 ########################################################################
 SYM_FUNC_START(sha512_transform_ssse3)
 
-       cmp $0, msglen
+       test msglen, msglen
        je nowork
 
        # Allocate Stack Space
-- 
2.26.2