tree 2fc3528006f5b576a6fb9f03bc2f170b80737687
parent 5a45bf1b48cd3d23faa3dfc27b8866bb536c4b9e
author Dan Gohman <gohman@apple.com> 1228863287 +0000
committer Dan Gohman <gohman@apple.com> 1228863287 +0000

Rewrite the SDep class, and simplify some of the related code.

The Cost field is removed. It was only being used in a very limited way,
to indicate when the scheduler should attempt to protect a live register,
and it isn't really needed to do that. If we ever want the scheduler to
start inserting copies in non-prohibitive situations, we'll have to
rethink some things anyway.

A Latency field is added. Instead of giving each node a single
fixed latency, each edge can have its own latency. This will eventually
be used to model various micro-architecture properties more accurately.

The PointerIntPair class and an internal union are now used, which
reduce the overall size.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@60806 91177308-0d34-0410-b5e6-96231b3b80d8