Update README

Author: virnarula

llvm/tools/loop-analyzer/README.md

@@ -1,26 +1,37 @@
 # Loop Analyzer
-## Setup
-Build using `ninja clang loop-analyzer`
+## Build Project
+Build using: `ninja clang loop-analyzer`.
 ## CL Usage
-1. Compile with clang, turn on profile training
+### Build Codebase to Analyze 
+
+1. Compile once with clang, turn on profiling options
+```
+clang++ -fprofile-instr-generate <file.c> && a.out
+```
+2. Run with profile information
 ```
-clang++ -
+LLVM_PROFILE_FILE=a.profraw ./a.out
+```
+3. Process raw profiling data
+```
+llvm-profdata a.profraw -o a.profdata
 ```
-1. 
 
-2. Compile with clang, with profiling information
+### Analyze Build
+4. Build again using profile information
 ```
-clang++ -fsave-optimization-record=bitstream -foptimization-record-passes=loop-extract-analysis [other-flags] <filename> -o <output_filename>
+clang -fprofile-instr-use=a.profdata <file.c> -o a.profile.out
 ```
-2. Extract Remarks
+
+5. Extract Remarks
 ```
-dsymutil <output_filename>
+dsymutil a.profile.out
 ```
-3. Loop Analysis
+6. Loop Analysis
 ```
 loop-analyzer <output_filename>.dSYM/Contents/Resources/Remarks/<output_filename>
 ```
 
 ## Program Description
 
-When we run the `loop-extract-analysis` pass, we are emiting a remark for each loop in the program. Our `loop-analyzer`
+<!-- When we run the `loop-extract-analysis` pass, we are emiting a remark for each loop in the program. Our `loop-analyzer` -->