Merge pull request #1 from tgangwani/master

Update README.md

Author: tgangwani

README.md

@@ -1,16 +1,16 @@
 Partial Redundancy Elimination (PRE)
 ====================================
 
-Is a compiler optimization that eliminates
+PRE is a compiler optimization that eliminates
 expressions that are redundant on some but not necessarily all paths through a
-program. In this project, we implemented a PRE optimization pass in LLVM 
-and measured results on a variety of applications. It's a powerful technique that subsumes 
+program. We implement a PRE optimization pass in the LLVM framework, and evaluate the benefits 
+on a variety of applications. PRE is a powerful technique that subsumes 
 Common Subexpression Elimination (CSE) and Loop Invariant Code Motion (LICM), and hence has a potential to 
 greatly improve performance.
 
-Commnads
+Commands
 -------
 
-opts_lcm = "-mem2reg -loop-rotate   -reassociate -lcm  -mem2reg -simplifycfy; 
+opts_lcm = "-mem2reg -loop-rotate -reassociate -lcm  -mem2reg -simplifycfy; 
 
 $opt -load $load_pass  $opts_lcm   $test.bc -o  $test-lcm.bc