tanya/arch/x64/linux/memory/cmp.S
Eugen Wissner faebf3e4d5 Fix #304
Replace inline assembly with GAS.
2017-09-26 08:26:12 +02:00

68 lines
878 B
ArmAsm

.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