PoliEcho/asm-game-of-life
PoliEcho/asm-game-of-life
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fix memory_set number 2

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PoliEcho 2025-07-09 20:34:09 +02:00
parent 2b8236ee91
commit d6613ac341
1 changed files with 8 additions and 36 deletions
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44
src/str.asm
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@ -80,8 +80,6 @@ global memory_set:
memory_set:; takes destination in rdi, byte in sil and lenght in rdx
; first check if value is 16 byte alligned
xor r8, r8
mov r9, rdi; move destination to r9
mov r11, 0x0101010101010101; to extend across whoule register
@ -90,7 +88,7 @@ memory_set:; takes destination in rdi, byte in sil and lenght in rdx
cmp rdx, 16
jnl .write_16_or_more_bytes
mov r8b, dl
mov cl, dl
jmp .write_less_than_16_bytes
.write_16_or_more_bytes:
mov rax, rdi; move destination to rax
@ -101,46 +99,20 @@ memory_set:; takes destination in rdi, byte in sil and lenght in rdx
jz .addr_is_16_Byte_alligned
mov r8b, 16
sub r8b, al; now offset to first higher 16 byte alligned address is stored in r8
mov cl, 16
sub cl, al; now offset to first higher 16 byte alligned address is stored in r8
mov rax, r11
.write_less_than_16_bytes:
sub rdx, r8; we will write these bytes now
sub rdx, rcx; we will write these bytes now
;add rdi, rdx
; we know that rdi has initial address and rdx offset so well fill just add to it
mov rcx, 1; we will allwais copy only once
cmp r8b, 8
jl .check_dword
rep stosq
sub r8b, 8
.check_dword:
cmp r8b, 4
jl .check_word
rep stosd
sub r8b, 4
.check_word:
cmp r8b, 2
jl .check_byte
rep stosw
sub r8b, 2
.check_byte:
test r8b, r8b; check if offset is 1 or 0
jz .addr_is_16_Byte_alligned
rep stosb
dec r8b
.addr_is_16_Byte_alligned:
mov rcx, rdx
shr rcx, 4; set it to how many 128bit(16Byte) chunk we need
test rcx, rcx; check if we need to write aditional 16 bytes at all
mov r10, rdx
shr r10, 4; set it to how many 128bit(16Byte) chunk we need
test r10, r10; check if we need to write aditional 16 bytes at all
jz .function_exit
%ifdef AVX512
@ -162,7 +134,7 @@ memory_set:; takes destination in rdi, byte in sil and lenght in rdx
test rdx, rdx; test if rdx is 0
jz .true_function_exit
mov r8b, dl
mov cl, dl
jmp .write_less_than_16_bytes
.true_function_exit: