[PATCH] [msan] Run more optimization after MemorySanitizer pass

[John McCall]

On Jan 29, 2013, at 3:29 AM, Evgeniy Stepanov <eugenis at google.com> wrote:
> ================
> Comment at: lib/CodeGen/BackendUtil.cpp:190
> @@ +189,3 @@
> +  // MemorySanitizer.
> +  if (Builder.OptLevel > 0) {
> +    PM.add(createEarlyCSEPass());
> ----------------
> Alexey Samsonov wrote:
>> I think that some comment mentioning the "difference" made by each optimization would
>> be nice.
> I don't think explaining the difference made by each pass is possible (and would not be helpful). I can add some aggregate performance numbers tomorrow (need to remeasure).

Are you re-running these passes to regain general optimization opportunities
after your pass removes or adjusts the msan instrumentation, or are you
re-running them to exploit opportunities *with* the msan instrumentation?

John.