notwa/lips
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implement all branch pseudo-instructions

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This commit is contained in:
Connor Olding 2016-05-08 15:21:16 -07:00
parent 8375eaff08
commit e4e8e16ea5
3 changed files with 100 additions and 47 deletions
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2
README.md
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@ -165,7 +165,7 @@ Whether or not they output the proper machine code is another thing.
* MUL, DIV, REM
* many Set/Branch pseudo-instructions
* many Set [Condition] pseudo-instructions
## Registers

13
lips/data.lua
View File

@ -443,12 +443,13 @@ data.instructions = {
BLT = o1, BLTU = o1,
BGT = o1, BGTU = o1,
BEQI = __, BEQIL = __,
BGEI = __, BGEIL = __,
BGTI = __, BGTIL = __,
BLEI = __, BLEIL = __,
BLTI = __, BLTIL = __,
BNEI = __, BNEIL = __,
-- note: signedness of BEQI/BNEI determines how the immediate is loaded
BEQI = __, BEQIU = __, BEQIL = __, BEQIUL = __,
BGEI = __, BGEIU = __, BGEIL = __, BGEIUL = __,
BGTI = __, BGTIU = __, BGTIL = __, BGTIUL = __,
BLEI = __, BLEIU = __, BLEIL = __, BLEIUL = __,
BLTI = __, BLTIU = __, BLTIL = __, BLTIUL = __,
BNEI = __, BNEIU = __, BNEIL = __, BNEIUL = __,
BGEL = o1, BGEUL = o1,
BGTL = o1, BGTUL = o1,

132
lips/overrides.lua
View File

@ -3,6 +3,14 @@ local insert = table.insert
local path = string.gsub(..., "[^.]+$", "")
local data = require(path.."data")
local function name_pop(name, character)
if name:sub(#name) == character then
return name:sub(1, #name - 1), character
else
return name, ''
end
end
local overrides = {}
-- note: "self" is an instance of Preproc
@ -163,6 +171,8 @@ function overrides:NORI(name)
self:push_new('NOR', dest, dest, 'R0') -- NOT
end
-- TODO: ROLV/RORV-like versions of this
-- maybe give the same auto-register treatment to SLL/SRL/SRA too
function overrides:ROL(name)
local first = name == 'ROL' and 'SLL' or 'SRL'
local second = name == 'ROL' and 'SRL' or 'SLL'
@ -205,65 +215,107 @@ function overrides:JR(name)
end
local branch_basics = {
BEQ = 'BEQ',
BGE = 'BEQ',
BGT = 'BNE',
BLE = 'BEQ',
BLT = 'BNE',
BGT = 'BNE',
BGEL = 'BEQL',
BLEL = 'BEQL',
BLTL = 'BNEL',
BGTL = 'BNEL',
BEQI = 'BEQ',
BGEI = 'BEQ',
BGTI = 'BEQ',
BLEI = 'BNE',
BLTI = 'BNE',
BNEI = 'BNE',
BEQIL = 'BEQL',
BGEIL = 'BEQL',
BGTIL = 'BEQL',
BLEIL = 'BNEL',
BLTIL = 'BNEL',
BNEIL = 'BNEL',
BNE = 'BNE',
}
function overrides:BLT(name)
local slt = name:sub(#name) == 'U' and 'SLTU' or 'SLT'
local branch = branch_basics[name:sub(1, 3)]
local likely, unsigned
name, likely = name_pop(name, 'L')
name, unsigned = name_pop(name, 'U')
local branch = branch_basics[name]
local a = self:pop('CPU')
local b = self:pop('CPU')
local offset = self:pop('CONST')
self:push_new(slt, 'AT', a, b)
self:push_new(branch, 'AT', 'R0', offset)
self:push_new('SLT'..unsigned, 'AT', a, b)
self:push_new(branch..likely, 'AT', 'R0', offset)
end
function overrides:BLE(name)
local slt = name:sub(#name) == 'U' and 'SLTU' or 'SLT'
local branch = branch_basics[name:sub(1, 3)]
local likely, unsigned
name, likely = name_pop(name, 'L')
name, unsigned = name_pop(name, 'U')
local branch = branch_basics[name]
local a = self:pop('CPU')
local b = self:pop('CPU')
local offset = self:pop('CONST')
self:push_new(slt, 'AT', b, a)
self:push_new(branch, 'AT', 'R0', offset)
self:push_new('SLT'..unsigned, 'AT', b, a)
self:push_new(branch..likely, 'AT', 'R0', offset)
end
overrides.BGE = overrides.BLT
overrides.BGT = overrides.BLE
function overrides:BLTI(name)
local likely, unsigned
name, likely = name_pop(name, 'L')
name, unsigned = name_pop(name, 'U')
local branch = branch_basics[name:sub(1, #name - 1)]
local reg = self:pop('CPU')
local im = self:pop('CONST')
local offset = self:pop('CONST')
self:push_new('SLTI'..unsigned, 'AT', reg, im)
self:push_new(branch..likely, 'AT', 'R0', offset)
end
overrides.BGEL = overrides.BLT
overrides.BGTL = overrides.BLE
overrides.BLEL = overrides.BLE
overrides.BLTL = overrides.BLT
function overrides:BLEI(name)
local likely, unsigned
name, likely = name_pop(name, 'L')
name, unsigned = name_pop(name, 'U')
local branch = branch_basics[name:sub(1, #name - 1)]
local loadi = unsigned == 'U' and 'ORI' or 'ADDIU'
local reg = self:pop('CPU')
local im = self:pop('CONST')
local offset = self:pop('CONST')
self:push_new(loadi, 'AT', 'R0', im)
self:push_new('SLT'..unsigned, 'AT', 'AT', reg)
self:push_new(branch..likely, 'AT', 'R0', offset)
end
overrides.BGEU = overrides.BLT
overrides.BGTU = overrides.BLE
overrides.BLEU = overrides.BLE
overrides.BLTU = overrides.BLT
function overrides:BEQI(name)
local likely, unsigned
name, likely = name_pop(name, 'L')
name, unsigned = name_pop(name, 'U')
local branch = name:sub(1, #name - 1)
local loadi = unsigned == 'U' and 'ORI' or 'ADDIU'
local reg = self:pop('CPU')
local im = self:pop('CONST')
local offset = self:pop('CONST')
self:push_new(loadi, 'AT', 'R0', im)
self:push_new(branch..likely, reg, 'AT', offset)
end
overrides.BGEUL = overrides.BLT
overrides.BGTUL = overrides.BLE
overrides.BLEUL = overrides.BLE
overrides.BLTUL = overrides.BLT
local BLT = overrides.BLT
local BLE = overrides.BLE
local BLTI = overrides.BLTI
local BLEI = overrides.BLEI
local BEQI = overrides.BEQI
for k, v in pairs{
BGE = BLT, BGEI = BLTI,
BGT = BLE, BGTI = BLEI,
BGEL = BLT, BGEIL = BLTI,
BGTL = BLE, BGTIL = BLEI,
BLEL = BLE, BLEIL = BLEI,
BLTL = BLT, BLTIL = BLTI,
BGEU = BLT, BGEIU = BLTI,
BGTU = BLE, BGTIU = BLEI,
BLEU = BLE, BLEIU = BLEI,
BLTU = BLT, BLTIU = BLTI,
BGEUL = BLT, BGEIUL = BLTI,
BGTUL = BLE, BGTIUL = BLEI,
BLEUL = BLE, BLEIUL = BLEI,
BLTUL = BLT, BLTIUL = BLTI,
BEQI = BEQI, BEQIU = BEQI,
BEQIL = BEQI, BEQIUL = BEQI,
BNEI = BEQI, BNEIU = BEQI,
BNEIL = BEQI, BNEIUL = BEQI,
} do
overrides[k] = v
end
return overrides