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| author | Sam Parker <sam.parker@arm.com> | 2020-08-21 09:27:21 +0100 |
|---|---|---|
| committer | Sam Parker <sam.parker@arm.com> | 2020-08-21 09:52:52 +0100 |
| commit | 47251582f5c2ac5962f52bc6ddd3d612c56ab83d (patch) | |
| tree | eff61b7c10e976870445358629ac3f10d83fdaf5 /llvm/lib/CodeGen/MachinePassManager.cpp | |
| parent | e1cd7cac8a36608616d515b64d12f2e86643970d (diff) | |
| download | llvm-47251582f5c2ac5962f52bc6ddd3d612c56ab83d.zip llvm-47251582f5c2ac5962f52bc6ddd3d612c56ab83d.tar.gz llvm-47251582f5c2ac5962f52bc6ddd3d612c56ab83d.tar.bz2 | |
[SimplifyCFG] Cost required selects
Before we speculatively execute a basic block, query the cost of
inserting the necessary select instructions against the phi folding
threshold. For non-trivial insertions, a more accurate decision can
probably be made during machine if-conversion. With minsize we query
the CodeSize cost, otherwise we use SizeAndLatency.
Differential Revision: https://reviews.llvm.org/D82438
Diffstat (limited to 'llvm/lib/CodeGen/MachinePassManager.cpp')
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