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Reset bits when stored

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Firebolt 2021-10-20 20:02:41 -04:00
parent f7c8c44b6a
commit d304628675
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GPG Key ID: 4219518A61A50458
1 changed files with 7 additions and 1 deletions
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8
runtime/luau.lua
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@ -38,6 +38,11 @@ local function rip_u64(x) return math.floor(x / 0x100000000), x % 0x100000000 en
local function merge_u64(hi, lo) return hi * 0x100000000 + lo end local function merge_u64(hi, lo) return hi * 0x100000000 + lo end
local function clear_byte(value, offset)
offset *= 8;
return bit32.band(value, bit32.bnot(bit32.lshift(0xFF, offset)));
end
local function load_byte(memory, addr) local function load_byte(memory, addr)
local offset = addr % 4 local offset = addr % 4
return bit32.rshift(memory.data[(addr - offset) / 4] or 0, 8 * offset) return bit32.rshift(memory.data[(addr - offset) / 4] or 0, 8 * offset)
@ -46,7 +51,8 @@ end
local function store_byte(memory, addr, value) local function store_byte(memory, addr, value)
local offset = addr % 4 local offset = addr % 4
local base = (addr - offset) / 4 local base = (addr - offset) / 4
memory.data[base] = bit32.bor(memory.data[base] or 0, bit32.lshift(value, 8 * offset)) local old = clear_byte(memory.data[base] or 0, offset);
memory.data[base] = bit32.bor(old, bit32.lshift(value, 8 * offset))
end end
-- Runtime functions -- Runtime functions