assembly - memcopy so slow... what's wrong?
Posted: Sun Feb 12, 2017 2:45 pm
I don't know what is wrong with this code:
Processor AMD Phenom x4 965 3.4 GHz
... it's look same on AMD C-60 1 GHz
https://youtu.be/g1oFKPzk5ec
https://www.youtube.com/watch?v=g1oFKPzk5ec[/youtube]
Processor AMD Phenom x4 965 3.4 GHz
... it's look same on AMD C-60 1 GHz
https://youtu.be/g1oFKPzk5ec
https://www.youtube.com/watch?v=g1oFKPzk5ec[/youtube]
Code: Select all
; http://forum.4programmers.net/Off-Topic/250332-cyjon_os?p=1268711#id1268711
shr rcx, STATIC_DIVIDE_BY_256
.loop:
prefetchnta [rsi + 256]
prefetchnta [rsi + 288]
prefetchnta [rsi + 320]
prefetchnta [rsi + 352]
prefetchnta [rsi + 384]
prefetchnta [rsi + 416]
prefetchnta [rsi + 448]
prefetchnta [rsi + 480]
movdqa xmm0, [rsi]
movdqa xmm1, [rsi + 0x10]
movdqa xmm2, [rsi + 0x20]
movdqa xmm3, [rsi + 0x30]
movdqa xmm4, [rsi + 0x40]
movdqa xmm5, [rsi + 0x50]
movdqa xmm6, [rsi + 0x60]
movdqa xmm7, [rsi + 0x70]
movdqa xmm8, [rsi + 0x80]
movdqa xmm9, [rsi + 0x90]
movdqa xmm10, [rsi + 0xA0]
movdqa xmm11, [rsi + 0xB0]
movdqa xmm12, [rsi + 0xC0]
movdqa xmm13, [rsi + 0xD0]
movdqa xmm14, [rsi + 0xE0]
movdqa xmm15, [rsi + 0xF0]
movntdq [rdi], xmm0
movntdq [rdi + 0x10], xmm1
movntdq [rdi + 0x20], xmm2
movntdq [rdi + 0x30], xmm3
movntdq [rdi + 0x40], xmm4
movntdq [rdi + 0x50], xmm5
movntdq [rdi + 0x60], xmm6
movntdq [rdi + 0x70], xmm7
movntdq [rdi + 0x80], xmm8
movntdq [rdi + 0x90], xmm9
movntdq [rdi + 0xA0], xmm10
movntdq [rdi + 0xB0], xmm11
movntdq [rdi + 0xC0], xmm12
movntdq [rdi + 0xD0], xmm13
movntdq [rdi + 0xE0], xmm14
movntdq [rdi + 0xF0], xmm15
add rsi, 256
add rdi, 256
dec rcx
jnz .loop
