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UPSTREAM: crypto: poly1305-x86_64 - Use XORL r32,32

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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>
Acked-by: Jason A. Donenfeld <Jason@zx2c4.com>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
(cherry picked from commit 7dfd1e01b3dfc13431b1b25720cf2692a7e111ef)
Bug: 152722841
Signed-off-by: Jason A. Donenfeld <Jason@zx2c4.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@google.com>
Change-Id: Ice946da2856551122eca8b589323ecc7b3b311af
This commit is contained in:
Uros Bizjak 2020-08-27 19:38:31 +02:00 committed by Greg Kroah-Hartman
parent 4dffe8cd70
commit beeb774515
1 changed files with 4 additions and 4 deletions
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8
arch/x86/crypto/poly1305-x86_64-cryptogams.pl
View file

@ -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)
@ -2869,7 +2869,7 @@ $code.=<<___;
.type poly1305_init_base2_44,\@function,3
.align 32
poly1305_init_base2_44:
xor %rax,%rax
xor %eax,%eax
mov %rax,0($ctx) # initialize hash value
mov %rax,8($ctx)
mov %rax,16($ctx)
@ -3963,7 +3963,7 @@ 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
@ -4101,7 +4101,7 @@ 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