README.md: Add software optimization links

README.md

@@ -53,6 +53,21 @@ This makes the following classes of pull requests very welcome:
 
 The CI benchmark suite will evolve over time starting from the [standard LuaJIT benchmarks](https://hydra.snabb.co/job/luajit/branchmarks/benchmarkResults/latest/download/2) (already covers RaptorJIT) and the [Snabb end-to-end benchmark suite](https://hydra.snabb.co/job/snabb-new-tests/benchmarks-murren-large/benchmark-reports.report-full-matrix/latest/download/2) (must be updated to cover RaptorJIT.)
 
+### Optimization resources
+
+These are the authoritative optimization resources for processors
+supported by RaptorJIT. If you are confused by references to CPU
+details in discussions then these are the places to look for answers.
+
+- [Computer Architecture: A Quantitiave Approach](https://www.amazon.com/Computer-Architecture-Fifth-Quantitative-Approach/dp/012383872X) by Hennessy and Patterson.
+- [Intel Architectures Optimization Reference Manual](http://www.intel.com/content/www/us/en/architecture-and-technology/64-ia-32-architectures-optimization-manual.html).
+- Agner Fog's [software optimization resources](http://www.agner.org/optimize/):
+    - [Instruction latency and throughput tables](http://www.agner.org/optimize/instruction_tables.pdf).
+    - [Microarchitecture of Intel, AMD, and VIA CPUs](http://www.agner.org/optimize/microarchitecture.pdf).
+    - [Optimizing subroutines in assembly language for x86](http://www.agner.org/optimize/optimizing_assembly.pdf).
+
+The [AnandTech review of the Haswell microarchitecture](http://www.anandtech.com/show/6355/intels-haswell-architecture) is also excellent lighter reading.
+
 ### Compilation
 
 RaptorJIT uses [nix](http://nixos.org/nix/) to define a reproducible