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Code Issues Releases Wiki Activity

fix some pseudo-branch instructions

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This commit is contained in:
Connor Olding 2016-04-21 04:23:47 -07:00
parent 6eac36584f
commit e25ee2013c
1 changed files with 5 additions and 4 deletions
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9
lips/overrides.lua
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@ -224,15 +224,15 @@ overrides.BNEIL = overrides.BEQI
function overrides.BLTI(self, name)
local branch = branch_basics[name]
local rs = self:pop('CPU')
local reg = self:pop('CPU')
local immediate = self:pop('CONST')
local offset = self:pop('REL'):set('signed')
if rs == 'AT' then
if reg == 'AT' then
self:error('register cannot be AT in this pseudo-instruction')
end
self:push_new('SLTI', 'AT', reg)
self:push_new('SLTI', 'AT', reg, immediate)
self:push_new(branch, 'R0', 'AT', offset)
end
@ -257,11 +257,12 @@ function overrides.BLEI(self, name)
if name == 'BLEI' then
beq_offset = offset
else
-- FIXME: this probably isn't correct for branch-likely instructions
beq_offset = 2 -- branch to delay slot of the next branch
end
self:push_new('BEQ', reg, 'R0', beq_offset)
self:push_new('SLT', 'AT', reg)
self:push_new('SLT', 'AT', reg, immediate)
self:push_new(branch, 'AT', 'R0', offset)
end