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Author SHA1 Message Date
Craig Topper bc895a3afc [X86] Enable popcnt false dependency breaking on Silvermont and Goldmont. 
Silvermont and Goldmont have the same issue on popcnt as Sandy Bridge, Haswell, Broadwell, and Skylake. Believe it is fixed in Goldmont Plus.

llvm-svn: 330358
 2018-04-19 19:25:24 +00:00
Craig Topper a8f87a36f1 [X86] Add FeaturePOPCNTFalseDeps to skylake server CPU to match skylake client. 
llvm-svn: 323700
 2018-01-29 21:56:48 +00:00
Marina Yatsina 77a21dbad4 Break false dependencies for POPCNT, LZCNT, TZCNT 
Add POPCNT, LZCNT, TZCNT to the list of instructions that have false dependency.
Add a test to make sure BreakFalseDeps breaks the dependencies for these instructions.
Update affected tests.

This fixes bugzilla https://bugs.llvm.org/show_bug.cgi?id=33869

This is the final of multiple patches that fix this bugzilla.
Most of the patches are intended at refactoring the existent code.

Reviews of the refactoring done to enable this change:
https://reviews.llvm.org/D40330
https://reviews.llvm.org/D40331
https://reviews.llvm.org/D40332
https://reviews.llvm.org/D40333

Differential Revision: https://reviews.llvm.org/D40334

Change-Id: If95cbf1a3f5c7dccff8f1b22ecb397542147303d
llvm-svn: 323096
 2018-01-22 10:07:01 +00:00