tree 75a402517e04749a54cb903cb97c53b9cff8e30e
parent c3b3ff1f3ef53aa3bb6fbc24b94347baca73d7e2
author Mads Ager <ager@google.com> 1498049827 +0200
committer Mads Ager <ager@google.com> 1498049827 +0200

Change register allocator to deal better with unconstrained uses.

When low on registers, if the interval we are currently attempting
to allocate a register for has an unconstrained first use, split
the current interval instead of finding another interval to split.

In addition, make the determination of when to split argument
values right after their definition more precise.

These changes shouldn't matter much at this point. However,
zerny@ is working on changes to debug information handling
that will make this occur a lot more for arguments. For such
cases this is needed and generates better code than we currently
do.

R=zerny@google.com

Change-Id: I6d83b91a15486d294c2c66f68b17cb871c0cbae1