Quentin Colombet 5725f56bb0 [LiveRangeEdit] Don't mess up with LiveInterval when a new vreg is created. ...

In r283838, we added the capability of splitting unspillable register.
When doing so we had to make sure the split live-ranges were also
unspillable and we did that by marking the related live-ranges in the
delegate method that is called when a new vreg is created.
However, by accessing the live-range there, we also triggered their lazy
computation (LiveIntervalAnalysis::getInterval) which is not what we
want in general. Indeed, later code in LiveRangeEdit is going to build
the live-ranges this lazy computation may mess up that computation
resulting in assertion failures. Namely, the createEmptyIntervalFrom
method expect that the live-range is going to be empty, not computed.

Thanks to Mikael Holmén <mikael.holmen@ericsson.com> for noticing and
reporting the problem.

llvm-svn: 293934

2017-02-02 20:44:36 +00:00

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