[PATCH] D44647: [X86] Add WriteCRC32 scheduler class

[Simon Pilgrim via Phabricator via llvm-commits]

RKSimon created this revision.
RKSimon added reviewers: craig.topper, gadi.haber, courbet, andreadb, spatel.

Currently CRC32 instructions use the WriteFAdd class, this patch splits them off into their own.

At the moment WriteCRC32 is mostly just a duplicate of WriteFAdd but it can now be tweaked on a target by target basis.

SandyBridge is interesting as its custom memory latencies don't often match the +4 cy in SBWriteResPair - I can add a 'memory latency' optional argument to SBWriteResPair to make it easier to remedy these cases if people want?


Repository:
  rL LLVM

https://reviews.llvm.org/D44647

Files:
  lib/Target/X86/X86InstrSSE.td
  lib/Target/X86/X86SchedBroadwell.td
  lib/Target/X86/X86SchedHaswell.td
  lib/Target/X86/X86SchedSandyBridge.td
  lib/Target/X86/X86SchedSkylakeClient.td
  lib/Target/X86/X86SchedSkylakeServer.td
  lib/Target/X86/X86Schedule.td
  lib/Target/X86/X86ScheduleBtVer2.td
  lib/Target/X86/X86ScheduleSLM.td
  lib/Target/X86/X86ScheduleZnver1.td
  test/CodeGen/X86/sse42-schedule.ll

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