diff options
Diffstat (limited to 'arch/x64/linux/memory/cmp.S')
| -rw-r--r-- | arch/x64/linux/memory/cmp.S | 67 |
1 files changed, 67 insertions, 0 deletions
diff --git a/arch/x64/linux/memory/cmp.S b/arch/x64/linux/memory/cmp.S new file mode 100644 index 0000000..169e2eb --- /dev/null +++ b/arch/x64/linux/memory/cmp.S @@ -0,0 +1,67 @@ + .text + +/* + * cmpMemory. + * + * rdi - r1 length + * rsi - r1 data. + * rdx - r2 length. + * rcx - r2 data. + */ + .globl _D5tanya6memory2op9cmpMemoryFNaNbNixAvxAvZi + .type _D5tanya6memory2op9cmpMemoryFNaNbNixAvxAvZi, @function + +_D5tanya6memory2op9cmpMemoryFNaNbNixAvxAvZi: + // Compare the lengths + cmp %rdx, %rdi + jl less + jg greater + + mov %rcx, %rdi + + // Check if we're aligned + cmp $0x08, %rdx + jc aligned_1 + test $0x07, %edi + jz aligned_8 + + naligned: + cmpsb + jl less + jg greater + + dec %rdx + test $0x07, %edi + jnz naligned + + aligned_8: + mov %rdx, %rcx + shr $0x03, %rcx + + repe cmpsq + jl less + jg greater + + and $0x07, %edx + jz equal + + aligned_1: // Compare the remaining bytes + mov %rdx, %rcx + + repe cmpsb + jl less + jg greater + + equal: + xor %rax, %rax // Return 0 + jmp end + + greater: + mov $0x01, %rax + jmp end + + less: + mov $-0x01, %rax + + end: + ret |