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# 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_fill
zap_fill:
# zap_i8 val1;
# zap_i04 val8;
movzx rax,sil # val8 = val;
shl rax,0x8 # val8 <<= 0x8u;
mov al,sil # val8 |= val;
shl rax,0x8 # val8 <<= 0x8u;
mov al,sil # val8 |= val;
shl rax,0x8 # val8 <<= 0x8u;
mov al,sil # val8 |= val;
shl rax,0x8 # val8 <<= 0x8u;
mov al,sil # val8 |= val;
shl rax,0x8 # val8 <<= 0x8u;
mov al,sil # val8 |= val;
shl rax,0x8 # val8 <<= 0x8u;
mov al,sil # val8 |= val;
shl rax,0x8 # val8 <<= 0x8u;
mov al,sil # val8 |= val;
# val1 = val8;
.wrdfill: # wrdfill:;
cmp rdx,0x8
jl .bytefill # if (num < 0x8u) goto bytefill;
mov [rdi],rax # *dest = val8;
add rdi,0x8 # dest += 0x8u;
sub rdx,0x8 # num -= 0x8u;
jmp .wrdfill # goto wrdfill
.bytefill: # bytefill:;
test rdx,rdx # if (rem == 0x0)
jz .done # goto done
mov [rsi],al # *dest = val1;
inc rdi # ++dest;
dec rdx # --rem;
jmp .bytefill # goto bytefill;
.done:
ret # return
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