diff options
Diffstat (limited to 'zap/source/amd64/mem')
| -rw-r--r-- | zap/source/amd64/mem/cp.s | 63 |
1 files changed, 63 insertions, 0 deletions
diff --git a/zap/source/amd64/mem/cp.s b/zap/source/amd64/mem/cp.s new file mode 100644 index 0000000..5985f04 --- /dev/null +++ b/zap/source/amd64/mem/cp.s @@ -0,0 +1,63 @@ +# Copyright 2022-2023 Gabriel Jensen. +# This Source Code Form is subject to the terms of the Mozilla Public License, v. 2.0. +# If a copy of the MPL was not distributed with this file, You can obtain one at <https://mozilla.org/MPL/2.0>. + +.intel_syntax noprefix + +.globl zap_cp + +zap_cp: + # zap_i8 val1; + # zap_i04 val8; + # unsigned int256_t val02; + +.big02cp: + cmp rdx,0x20 + jl .big01cp # if (num < 0x20u) goto big01cp; + + vmovups ymm0,[rsi] # val01 = *src; + vmovups [rdi],ymm0 # *dest = val01; + + add rsi,0x20 # dest += 0x20u; + add rdi,0x20 # src += 0x20u; + sub rdx,0x20 # num -= 0x20u; + jmp .big02cp # goto big02cp; + +.big01cp: + cmp rdx,0x10 + jl .wrdcp # if (num < 0x10u) goto wrdcp; + + movdqu xmm0,[rsi] # val01 = *src; + movdqu [rdi],xmm0 # *dest = val01; + + add rsi,0x10 # dest += 0x10u; + add rdi,0x10 # src += 0x10u; + sub rdx,0x10 # num -= 0x10u; + jmp .big01cp # goto big01cp; + +.wrdcp: + cmp rdx,0x8 + jl .bytecp # if (num < 0x8u) goto bytecp; + + mov rcx,[rsi] # val8 = *src; + mov [rdi],rcx # *dest = val8; + + add rdi,0x8 # dest += 0x8u; + add rsi,0x8 # src += 0x8u; + sub rdx,0x8 # num -= 0x8u; + jmp .wrdcp # goto wrdcp + +.bytecp: + test rdx,rdx # if (rem == 0x0) + jz .done # goto done + + mov cl,[rsi] # val1 = *src; + mov [rsi],cl # *dest = val1; + + inc rdi # ++dest; + inc rsi # ++src; + dec rdx # --rem; + jmp .bytecp # goto bytecp; + +.done: + ret # return |