From: Mike Lowis <mike.lowis@gentex.com>
Date: Mon, 20 Nov 2023 21:32:45 +0000 (-0500)
Subject: started adding  comparison operators
X-Git-Url: https://git.mdlowis.com/?a=commitdiff_plain;h=c7ef43e00d9c3b874b0619d62497afd5d82ead61;p=proto%2Faas.git

started adding  comparison operators
---

diff --git a/aas.rb b/aas.rb
index 4f69b8e..3ff42f6 100755
--- a/aas.rb
+++ b/aas.rb
@@ -1,18 +1,18 @@
 #!/bin/env ruby
 
 # TODO:
-# remove tempfile usage
-# implement peephole optimization
+# local variable loading
+# local variable saving
+# implement if statements
+#
 # global variable addressing
 # global variable loading
 # global variable saving
 # local variable addressing
-# local variable loading
-# local variable saving
 # parameter variable addressing
-# parameter variable loading
 # parameter variable saving
-# implement if statements
+# remove tempfile usage
+# implement peephole optimization
 
 require "tempfile"
 
@@ -290,13 +290,28 @@ class Function
   end
 
   ##
-  # Function Scaffolding: Locals and Returns
+  # Function Scaffolding: Parameters, Locals, and Returns
   ##
   def get_param(num)
     emit "movq      #{8*(num+2)}(%rbp), %rax"
     emit "pushq     %rax"
   end
 
+  def set_param(num)
+    emit "popq      %rax"
+    emit "movq      %rax, #{8*(num+2)}(%rbp)"
+  end
+
+  def get_local(num)
+    emit "movq      #{-8*(num)}(%rbp), %rax"
+    emit "pushq     %rax"
+  end
+
+  def set_local(num)
+    emit "popq      %rax"
+    emit "movq      %rax, #{-8*num}(%rbp)"
+  end
+
   def locals(count)
     $asm_out.write "subq     $#{count * 8}, %rsp\n"
   end
diff --git a/cerise.m b/cerise.m
index 8de6003..ba239de 100644
--- a/cerise.m
+++ b/cerise.m
@@ -1,6 +1,6 @@
 sum(a,b)
 {
-    return a+b
+    return a<b
 }
 
 main()
diff --git a/cerise.rb b/cerise.rb
index 836940f..e4e82a7 100755
--- a/cerise.rb
+++ b/cerise.rb
@@ -562,11 +562,17 @@ class Parser
 
 
   OPERATORS = {
-    "+" => true,
-    "-" => true,
-    "*" => true,
-    "/" => true,
-    "%" => true,
+    "+"  => true,
+    "-"  => true,
+    "*"  => true,
+    "/"  => true,
+    "%"  => true,
+    "<"  => true,
+    ">"  => true,
+    "<=" => true,
+    ">=" => true,
+    "==" => true,
+    "!=" => true,
   }
 
   def operator?
@@ -665,7 +671,12 @@ class Parser
   end
 
   def expression()
-    simple_expr()
+    left = simple_expr()
+    if matches_any(["==", "!=", "<", "<=", ">", ">="])
+      right = simple_expr()
+      left = IR::Op.new(op.location, nil, op.text, left, right)
+    end
+    left
   end
 
   def simple_expr()
@@ -785,6 +796,8 @@ module Codegen
       puts "    divi"
     when "%"
       puts "    modi"
+    when "<"
+      puts "    lti"
     else
       raise "not implemented"
     end