# HG changeset patch
# User Christian Urban <urbanc@in.tum.de>
# Date 1571220048 -3600
# Node ID 732cb155d806642ecaf788d4b2aa089798a52d61
# Parent  cfc0e730bcdace4f23fe99ca75880082b538419c
updated

diff -r cfc0e730bcda -r 732cb155d806 coursework/cw02.pdf
Binary file coursework/cw02.pdf has changed
diff -r cfc0e730bcda -r 732cb155d806 coursework/cw02.tex
--- a/coursework/cw02.tex	Mon Oct 14 00:48:01 2019 +0100
+++ b/coursework/cw02.tex	Wed Oct 16 11:00:48 2019 +0100
@@ -173,7 +173,8 @@
 after each derivation step and rectify the computed values after each
 injection. Use this lexer to tokenize the programs in
 Figure~\ref{fib} and \ref{loop}. Give the tokens of these
-programs where whitespaces are filtered out.\bigskip
+programs where whitespaces are filtered out. Make sure you can
+tokenise \textbf{exactly} these programs.\bigskip
 
 
 \begin{figure}[h]
diff -r cfc0e730bcda -r 732cb155d806 progs/fun_llvm.scala
--- a/progs/fun_llvm.scala	Mon Oct 14 00:48:01 2019 +0100
+++ b/progs/fun_llvm.scala	Wed Oct 16 11:00:48 2019 +0100
@@ -271,5 +271,46 @@
 def main(args: Array[String]) : Unit = 
    //println(compile(args(0)))
    compile_and_run(args(0))
+}
 
-}
\ No newline at end of file
+
+
+
+
+/*
+LLVM notes
+
+Registers are places for data inside the CPU.
++ up to 10 times faster access than to main memory 
+- expensive; typically just 32 of them in a 32-bit CPU
+
+High-level view of x86
+• Not a stack machine; no direct correspondence to operand stacks
+• Arithmetics, etc. is done with values in registers
+
+• Started as academic project at University of Illinois in 2002
+• Now a large open source project with many contributors and a growing user base
+
+Single Static Assignment (SSA) form
+• Only one assignment in the program text to each variable
+• But dynamically, this assignment can be executed many times
+• Many stores to a memory location are allowed
+• Also, Φ (phi) instructions can be used, in the beginning of a basic block
+• Value is one of the arguments, depending on from which block control came to this block
+• Register allocation tries to keep these variables in same real register
+
+Why SSA form?
+Many code optimizations can be done more efficiently
+
+Function definition form
+ define t @name(t1 x1, t2 x2, ..., tn xn) {
+ l1: block1
+ l2: block2
+ ... 
+ lm : blockm
+ }
+
+
+
+
+*/
\ No newline at end of file