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[PPCGCodeGen] Document pre-composition with Zero in getExtent. [NFC]

Authored by bollu on Sep 7 2017, 4:57 AM.

Description

[PPCGCodeGen] Document pre-composition with Zero in getExtent. [NFC]

It's weird at first glance that we do this, so I wrote up some
documentation on why we need to perform this process.

llvm-svn: 312715

Details

Committed
bolluSep 7 2017, 4:57 AM
Parents
rGcf0cdd4c027d: [MachineTraceMetrics] Add computeDepth function (NFCI).
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