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Reapply r295371 with a fix for the Windows bot failures.
llvm-svn: 295504
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This reverts commit r295371.
It broke windows bots:
http://bb.pgr.jp/builders/ninja-clang-i686-msc19-R/builds/11402/steps/test-llvm/logs/stdio
llvm-svn: 295402
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All the cool targets are doing it...
llvm-svn: 295371
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Replace spills to memory with spills to registers, if possible. This
applies mostly to predicate registers (both scalar and vector), since
they are very limited in number. A spill of a predicate register may
happen even if there is a general-purpose register available. In cases
like this the stack spill/reload may be eliminated completely.
This optimization will consider all stack objects, regardless of where
they came from and try to match the live range of the stack slot with
a dead range of a register from an appropriate register class.
llvm-svn: 260758
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