Messages in this thread Patch in this message | | | Date | Fri, 18 May 2018 00:30:01 +0300 | From | Alexey Dobriyan <> | Subject | [PATCH 1/3] x86: verify_cpu: use 32-bit arithmetic |
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32-bit instructions are 1 byte shorter than 16-bit instructions.
Signed-off-by: Alexey Dobriyan <adobriyan@gmail.com> ---
arch/x86/kernel/verify_cpu.S | 8 ++++---- 1 file changed, 4 insertions(+), 4 deletions(-)
--- a/arch/x86/kernel/verify_cpu.S +++ b/arch/x86/kernel/verify_cpu.S @@ -56,14 +56,14 @@ ENTRY(verify_cpu) cmpl $0x1,%eax jb .Lverify_cpu_no_longmode # no cpuid 1 - xor %di,%di + xor %edi, %edi cmpl $0x68747541,%ebx # AuthenticAMD jnz .Lverify_cpu_noamd cmpl $0x69746e65,%edx jnz .Lverify_cpu_noamd cmpl $0x444d4163,%ecx jnz .Lverify_cpu_noamd - mov $1,%di # cpu is from AMD + mov $1, %edi # cpu is from AMD jmp .Lverify_cpu_check .Lverify_cpu_noamd: @@ -122,13 +122,13 @@ ENTRY(verify_cpu) andl $SSE_MASK,%edx cmpl $SSE_MASK,%edx je .Lverify_cpu_sse_ok - test %di,%di + test %edi, %edi jz .Lverify_cpu_no_longmode # only try to force SSE on AMD movl $MSR_K7_HWCR,%ecx rdmsr btr $15,%eax # enable SSE wrmsr - xor %di,%di # don't loop + xor %edi, %edi # don't loop jmp .Lverify_cpu_sse_test # try again .Lverify_cpu_no_longmode:
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