From: Uros Bizjak <ubizjak@gmail.com>
To: linux-crypto@vger.kernel.org, x86@kernel.org
Cc: Uros Bizjak <ubizjak@gmail.com>,
Herbert Xu <herbert@gondor.apana.org.au>,
"David S. Miller" <davem@davemloft.net>
Subject: [PATCH] crypto/x86: Use XORL r32,32 in poly1305-x86_64-cryptogams.pl
Date: Thu, 27 Aug 2020 19:38:31 +0200 [thread overview]
Message-ID: <20200827173831.95039-1-ubizjak@gmail.com> (raw)
x86_64 zero extends 32bit operations, so for 64bit operands,
XORL r32,r32 is functionally equal to XORQ r64,r64, but avoids
a REX prefix byte when legacy registers are used.
Signed-off-by: Uros Bizjak <ubizjak@gmail.com>
Cc: Herbert Xu <herbert@gondor.apana.org.au>
Cc: "David S. Miller" <davem@davemloft.net>
---
arch/x86/crypto/poly1305-x86_64-cryptogams.pl | 8 ++++----
1 file changed, 4 insertions(+), 4 deletions(-)
diff --git a/arch/x86/crypto/poly1305-x86_64-cryptogams.pl b/arch/x86/crypto/poly1305-x86_64-cryptogams.pl
index 137edcf038cb..7d568012cc15 100644
--- a/arch/x86/crypto/poly1305-x86_64-cryptogams.pl
+++ b/arch/x86/crypto/poly1305-x86_64-cryptogams.pl
@@ -246,7 +246,7 @@ $code.=<<___ if (!$kernel);
___
&declare_function("poly1305_init_x86_64", 32, 3);
$code.=<<___;
- xor %rax,%rax
+ xor %eax,%eax
mov %rax,0($ctx) # initialize hash value
mov %rax,8($ctx)
mov %rax,16($ctx)
@@ -2853,7 +2853,7 @@ $code.=<<___;
.type poly1305_init_base2_44,\@function,3
.align 32
poly1305_init_base2_44:
- xor %rax,%rax
+ xor %eax,%eax
mov %rax,0($ctx) # initialize hash value
mov %rax,8($ctx)
mov %rax,16($ctx)
@@ -3947,7 +3947,7 @@ xor128_decrypt_n_pad:
mov \$16,$len
sub %r10,$len
xor %eax,%eax
- xor %r11,%r11
+ xor %r11d,%r11d
.Loop_dec_byte:
mov ($inp,$otp),%r11b
mov ($otp),%al
@@ -4085,7 +4085,7 @@ avx_handler:
.long 0xa548f3fc # cld; rep movsq
mov $disp,%rsi
- xor %rcx,%rcx # arg1, UNW_FLAG_NHANDLER
+ xor %ecx,%ecx # arg1, UNW_FLAG_NHANDLER
mov 8(%rsi),%rdx # arg2, disp->ImageBase
mov 0(%rsi),%r8 # arg3, disp->ControlPc
mov 16(%rsi),%r9 # arg4, disp->FunctionEntry
--
2.26.2
next reply other threads:[~2020-08-27 17:38 UTC|newest]
Thread overview: 5+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-08-27 17:38 Uros Bizjak [this message]
2020-09-01 19:16 ` [PATCH] crypto/x86: Use XORL r32,32 in poly1305-x86_64-cryptogams.pl Jason A. Donenfeld
2020-09-02 5:52 ` Uros Bizjak
2020-09-07 13:16 ` Jason A. Donenfeld
2020-09-11 6:56 ` Herbert Xu
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