[PATCH] D19821: [EarlyCSE] Optionally use MemorySSA. NFC.

[Geoff Berry via llvm-commits]

gberry added a comment.

I've collected some compile time stats when enabling MemorySSA EarlyCSE just for the EarlyCSE pass added at the beginning of addFunctionSimplificationPasses at O2 and higher.
There were 8 benchmarks in the llvm test-suite whose compile time increased by more than 1%.  The biggest increase was in consumer-typeset.  Drilling down a bit, the MemorySSA construction time for compiling the z44.c input to this benchmark is reported as 2% of runtime.


https://reviews.llvm.org/D19821