From b596405e7619fafba4e04b7a5042060a34a304f1 Mon Sep 17 00:00:00 2001
From: Connor Olding <cloningdonor@gmail.com>
Date: Sun, 1 May 2016 00:56:15 -0700
Subject: [PATCH] add basic branch pseudos, add REG(REG) addressing

---
 lips/overrides.lua | 43 +++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 43 insertions(+)

diff --git a/lips/overrides.lua b/lips/overrides.lua
index 7cdc7a5..283a3bc 100644
--- a/lips/overrides.lua
+++ b/lips/overrides.lua
@@ -13,6 +13,12 @@ local function tob_override(self, name)
     if self:peek('DEREF') then
         offset = 0
         base = self:pop('DEREF')
+    elseif self:peek('REG') then
+        local o = self:pop('CPU')
+        local b = self:pop('DEREF'):set('tt', 'REG')
+        self:push_new('ADDU', 'AT', o, b)
+        offset = 0
+        base = self:token('DEREF', 'AT')
     else -- NUM or LABELSYM
         local o = self:pop('CONST')
         if self:peek('NUM') then
@@ -213,6 +219,43 @@ local branch_basics = {
     BNEIL = 'BNEL',
 }
 
+function overrides:BLT(name)
+    local slt = name:sub(#name) == 'U' and 'SLTU' or 'SLT'
+    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('BNEZ', 'AT', offset)
+end
+function overrides:BGE(name)
+    local slt = name:sub(#name) == 'U' and 'SLTU' or 'SLT'
+    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('BEQZ', 'AT', offset)
+end
+function overrides:BLE(name)
+    local slt = name:sub(#name) == 'U' and 'SLTU' or 'SLT'
+    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('BEQZ', 'AT', offset)
+end
+function overrides:BGT(name)
+    local slt = name:sub(#name) == 'U' and 'SLTU' or 'SLT'
+    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('BNEZ', 'AT', offset)
+end
+overrides.BLTU = overrides.BLT
+overrides.BGEU = overrides.BGE
+overrides.BLEU = overrides.BLE
+overrides.BGTU = overrides.BGT
+
 function overrides:BEQI(name)
     local branch = branch_basics[name]
     local reg = self:pop('CPU')