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Author SHA1 Message Date
Wei Mi 7e103d92cc Recommit 'Remove the restriction that MachineSinking is now stopped by 
"insert_subreg, subreg_to_reg, and reg_sequence" instructions' after
adjusting some unittest checks.

This is to solve PR28852. The restriction was added at 2010 to make better register
coalescing. We assumed that it was not necessary any more. Testing results on x86
supported the assumption.

We will look closely to any performance impact it will bring and will be prepared
to help analyzing performance problem found on other architectures.

Differential Revision: https://reviews.llvm.org/D23210

llvm-svn: 278466
 2016-08-12 03:33:22 +00:00
Tim Northover da6f5f2d0a Remove empty file left by partial reversion. 
llvm-svn: 278411
 2016-08-11 21:01:15 +00:00
Wei Mi 3ab5816000 Revert rL278384 which caused several buildbot failures (like check failures in CodeGen/X86/clz.ll). 
llvm-svn: 278402
 2016-08-11 20:33:37 +00:00
Wei Mi ec19b35179 Remove the restriction that MachineSinking is now stopped by "insert_subreg, 
subreg_to_reg, and reg_sequence" instructions.

This is to solve PR28852. The restriction was added at 2010 to make better register
coalescing. We assumed that it was not necessary any more. Testing results on x86
supported the assumption.

We will look closely to any performance impact it will bring and will be prepared
to help analyzing performance problem found on other architectures.

Differential Revision: https://reviews.llvm.org/D23210

llvm-svn: 278384
 2016-08-11 18:42:56 +00:00