69 lines
895 B
ArmAsm
69 lines
895 B
ArmAsm
.text
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/*
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* cmpMemory.
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*
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* rdi - r1 length
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* rsi - r1 data.
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* rdx - r2 length.
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* rcx - r2 data.
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*/
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.globl _D5tanya6memory2op9cmpMemoryFNaNbNixAvxAvZi
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.type _D5tanya6memory2op9cmpMemoryFNaNbNixAvxAvZi, @function
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_D5tanya6memory2op9cmpMemoryFNaNbNixAvxAvZi:
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// Compare the lengths
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cmp %rdx, %rdi
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jl less
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jg greater
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mov %rcx, %rdi
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// Check if we're aligned
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cmp $0x08, %rdx
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jc aligned_1
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test $0x07, %edi
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jz aligned_8
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naligned:
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cmpsb
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jl less
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jg greater
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dec %rdx
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test $0x07, %edi
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jnz naligned
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aligned_8:
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mov %rdx, %rcx
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shr $0x03, %rcx
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repe cmpsq
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jl less
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jg greater
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and $0x07, %edx
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jz equal
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aligned_1: // Compare the remaining bytes
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mov %rdx, %rcx
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cmp $0x0, %rcx
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repe cmpsb
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jl less
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jg greater
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equal:
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xor %rax, %rax // Return 0
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jmp end
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greater:
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mov $0x01, %rax
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jmp end
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less:
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mov $-0x01, %rax
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end:
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ret
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