p71924506
/
linux_old1
1
0
Fork 0
Code Issues Pull Requests Projects Releases Wiki Activity

x86/asm: Replace "MOVQ $imm, %reg" with MOVL 

There is no reason to use MOVQ to load a non-negative immediate
constant value into a 64-bit register. MOVL does the same, since
the upper 32 bits are zero-extended by the CPU.

This makes the code a bit smaller, while leaving functionality
unchanged.

Signed-off-by: Denys Vlasenko <dvlasenk@redhat.com>
Cc: Alexei Starovoitov <ast@plumgrid.com>
Cc: Andy Lutomirski <luto@amacapital.net>
Cc: Borislav Petkov <bp@alien8.de>
Cc: Frederic Weisbecker <fweisbec@gmail.com>
Cc: H. Peter Anvin <hpa@zytor.com>
Cc: Kees Cook <keescook@chromium.org>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Oleg Nesterov <oleg@redhat.com>
Cc: Steven Rostedt <rostedt@goodmis.org>
Cc: Will Drewry <wad@chromium.org>
Link: http://lkml.kernel.org/r/1427821211-25099-8-git-send-email-dvlasenk@redhat.com
Signed-off-by: Ingo Molnar <mingo@kernel.org>
This commit is contained in:
Denys Vlasenko 2015-03-31 19:00:10 +02:00 committed by Ingo Molnar
parent 36acef2510
commit a734b4a23e
3 changed files with 7 additions and 7 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

2
arch/x86/crypto/crc32c-pcl-intel-asm_64.S
View File

@ -178,7 +178,7 @@ continue_block:
## 2a) PROCESS FULL BLOCKS:
################################################################
full_block:
movq $128,%rax
movl $128,%eax
lea 128*8*2(block_0), block_1
lea 128*8*3(block_0), block_2
add $128*8*1, block_0

4
arch/x86/crypto/twofish-x86_64-asm_64.S
View File

@ -264,7 +264,7 @@ ENTRY(twofish_enc_blk)
movq R1, 8(%rsi)
popq R1
movq $1,%rax
movl $1,%eax
ret
ENDPROC(twofish_enc_blk)
@ -316,6 +316,6 @@ ENTRY(twofish_dec_blk)
movq R1, 8(%rsi)
popq R1
movq $1,%rax
movl $1,%eax
ret
ENDPROC(twofish_dec_blk)

8
arch/x86/kernel/relocate_kernel_64.S
View File

@ -123,7 +123,7 @@ identity_mapped:
* Set cr4 to a known state:
* - physical address extension enabled
*/
movq $X86_CR4_PAE, %rax
movl $X86_CR4_PAE, %eax
movq %rax, %cr4
jmp 1f
@ -246,17 +246,17 @@ swap_pages:
movq %rsi, %rax
movq %r10, %rdi
movq $512, %rcx
movl $512, %ecx
rep ; movsq
movq %rax, %rdi
movq %rdx, %rsi
movq $512, %rcx
movl $512, %ecx
rep ; movsq
movq %rdx, %rdi
movq %r10, %rsi
movq $512, %rcx
movl $512, %ecx
rep ; movsq
lea PAGE_SIZE(%rax), %rsi