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[BranchFolding] do not iterate the aliases of virtual registers

Authored by jingyue on Jul 13 2015, 10:15 PM.



MCRegAliasIterator only works for physical registers. So, do not run it
on virtual registers.

With this issue fixed, we can resurrect the BranchFolding pass in NVPTX

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jingyue updated this revision to Diff 29643.Jul 13 2015, 10:15 PM
jingyue retitled this revision from to [BranchFolding] do not iterate the aliases of virtual registers.
jingyue updated this object.
jingyue added reviewers: bkramer, jholewinski.
jingyue added subscribers: llvm-commits, meheff, henryhu.
bkramer edited edge metadata.Jul 21 2015, 3:29 PM

This looks good with one comment below. Also the top comment in this file could use an update so it's clear that the pass has to handle vregs too.

1812–1816 ↗(On Diff #29643)

The alias iterator has the IncludeSelf flag set, so shouldn't Reg be removed from the set even if it's a vreg?

jingyue updated this revision to Diff 30311.Jul 21 2015, 7:45 PM
jingyue edited edge metadata.

fixed the bug Ben pointed out

jingyue marked an inline comment as done.Jul 21 2015, 7:45 PM

Nice catch. Thank you!

jingyue updated this revision to Diff 30313.Jul 21 2015, 7:56 PM

update header comments

This revision was automatically updated to reflect the committed changes.