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cost 0 anyway for free regs
The 2nd loop calculates spill costs but reports free registers as cost
0 anyway, so there is little benefit from having a separate early
loop.
Surprisingly this is not NFC, as many register are marked regDisabled
so the first loop often picks up later registers unnecessarily instead
of the first one available in the allocation order...
Patch by Matthias Braun
llvm-svn: 356499
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Tests updated to explicitly use fast-isel at -O0 instead of implicitly.
This change also allows an explicit -fast-isel option to override an
implicitly enabled global-isel. Otherwise -fast-isel would have no effect at -O0.
Differential Revision: https://reviews.llvm.org/D41362
llvm-svn: 321655
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Summary:
- Fix assertion failures on F16 to/from int types in FastISel by falling
back to regular ISel
- Add a testcase of various conversion cases with FastISel (-O0)
Reviewers: kristof.beyls, jmolloy, SjoerdMeijer
Reviewed By: SjoerdMeijer
Subscribers: SjoerdMeijer, llvm-commits, srhines, pirama, aemerson, rengolin, javed.absar, kristof.beyls
Differential Revision: https://reviews.llvm.org/D33734
llvm-svn: 305127
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