diff options
| author | Uros Bizjak <ubizjak@gmail.com> | 2020-08-27 19:38:31 +0200 |
|---|---|---|
| committer | Herbert Xu <herbert@gondor.apana.org.au> | 2020-09-11 14:39:13 +1000 |
| commit | 7dfd1e01b3dfc13431b1b25720cf2692a7e111ef (patch) | |
| tree | f2ea7954fc9e206333acb397e873311924e8948d | |
| parent | db719539fd3889836900bf912755aa30a5985e9a (diff) | |
crypto: poly1305-x86_64 - Use XORL r32,32
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>
| -rw-r--r-- | arch/x86/crypto/poly1305-x86_64-cryptogams.pl | 8 |
1 files 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 |