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| author | Duncan P. N. Exon Smith <dexonsmith@apple.com> | 2014-04-08 19:18:56 +0000 |
|---|---|---|
| committer | Duncan P. N. Exon Smith <dexonsmith@apple.com> | 2014-04-08 19:18:56 +0000 |
| commit | 861e4db90533e6ba7de77c33d7a06857433616ff (patch) | |
| tree | 3b0ce623b6837a91acc34d9fc7e20df9dcfd8223 /docs/CodingStandards.rst | |
| parent | c0c10f20a20f281b79adf4b9cf995c5144338078 (diff) | |
| download | llvm-861e4db90533e6ba7de77c33d7a06857433616ff.tar.gz llvm-861e4db90533e6ba7de77c33d7a06857433616ff.tar.bz2 llvm-861e4db90533e6ba7de77c33d7a06857433616ff.tar.xz | |
RegAlloc: Account for a variable entry block frequency
Until r197284, the entry frequency was constant -- i.e., set to 2^14.
Although current ToT still has a constant entry frequency, since r197284
that has been an implementation detail (which is soon going to change).
- r204690 made the wrong assumption for the CSRCost metric. Adjust
callee-saved register cost based on entry frequency.
- r185393 made the wrong assumption (although it was valid at the
time). Update SpillPlacement.cpp::Threshold to be relative to the
entry frequency.
Since ToT still has 2^14 entry frequency, this should have no observable
functionality change.
<rdar://problem/14292693>
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@205789 91177308-0d34-0410-b5e6-96231b3b80d8
Diffstat (limited to 'docs/CodingStandards.rst')
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