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| author | Uros Bizjak <ubizjak@gmail.com> | 2024-01-24 13:38:59 +0300 |
|---|---|---|
| committer | Ingo Molnar <mingo@kernel.org> | 2024-03-01 14:47:37 +0300 |
| commit | 721f791ce1cddfa5f2bf524ac14741bfa0f72697 (patch) | |
| tree | d3e38ba1c8505147a4fbf5c1c3202a26ea486908 /include/linux/fpga/fpga-mgr.h | |
| parent | 891f8890a4a3663da7056542757022870b499bc1 (diff) | |
| download | linux-721f791ce1cddfa5f2bf524ac14741bfa0f72697.tar.xz | |
x86/boot: Use 32-bit XOR to clear registers
x86_64 zero extends 32-bit operations, so for 64-bit operands,
XORL r32,r32 is functionally equal to XORQ r64,r64, but avoids
a REX prefix byte when legacy registers are used.
Slightly smaller code generated, no change in functionality.
Signed-off-by: Uros Bizjak <ubizjak@gmail.com>
Signed-off-by: Ingo Molnar <mingo@kernel.org>
Cc: Andy Lutomirski <luto@kernel.org>
Cc: Brian Gerst <brgerst@gmail.com>
Cc: Denys Vlasenko <dvlasenk@redhat.com>
Cc: H. Peter Anvin <hpa@zytor.com>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Josh Poimboeuf <jpoimboe@redhat.com>
Cc: Ard Biesheuvel <ardb@kernel.org>
Link: https://lore.kernel.org/r/20240124103859.611372-1-ubizjak@gmail.com
Diffstat (limited to 'include/linux/fpga/fpga-mgr.h')
0 files changed, 0 insertions, 0 deletions