Evan Cheng
bbed81df25
Add Mode64Bit feature and sink it down to MC layer.
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llvm-svn: 134641
2011-07-07 21:06:52 +00:00
Evan Cheng
ae26b91353
Revert r122955. It seems using movups to lower memcpy can cause massive regression (even on Nehalem) in edge cases. I also didn't see any real performance benefit.
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llvm-svn: 123015
2011-01-07 19:35:30 +00:00
Evan Cheng
1a1771584e
Use movups to lower memcpy and memset even if it's not fast (like corei7).
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The theory is it's still faster than a pair of movq / a quad of movl. This
will probably hurt older chips like P4 but should run faster on current
and future Intel processors. rdar://8817010
llvm-svn: 122955
2011-01-06 07:58:36 +00:00
Evan Cheng
619f1b8a94
Coalescer should not delete copy instructions whose defs are partially dead. e.g.
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%RDI<def,dead> = MOV64rr %RAX<kill>, %EDI<imp-def>
llvm-svn: 100804
2010-04-08 20:02:37 +00:00
