This patch mechanically replaces None with std::nullopt where the
compiler would warn if None were deprecated. The intent is to reduce
the amount of manual work required in migrating from Optional to
std::optional.
This is part of an effort to migrate from llvm::Optional to
std::optional:
https://discourse.llvm.org/t/deprecating-llvm-optional-x-hasvalue-getvalue-getvalueor/63716
ce3c3cb2912425bb4367bfbe9a4c68a6d6f0a04a broke this by
speculatively making transforms before checking shouldKeep.
Originally I tried to roll back changes to the IR, but it's probably
best to not touch it before querying.
So we don't over count the number of chunks and do unnecessary work reducing more chunks than exist.
This lowers some random reduction I tested with locally from 250s to 232s.
Reviewed By: arsenm
Differential Revision: https://reviews.llvm.org/D136127
We randomly use outs() or errs(), which makes test logs confusing.
We also randomly add/don't add a line afterward.
Reviewed By: arsenm
Differential Revision: https://reviews.llvm.org/D136130
Try some dumb strength reductions to "simpler" opcodes.
Make some opcode substitutions I typically try to get smaller
MIR out of codegen. This is a bit target specific and I have a
lot of increasingly target specific modifications I try
during manual reduction.
