[PATCH] D59547: [X86] Remove X86 specific dag nodes for RDTSC/RDTSCP/RDPMC. NFCI

[Andrea Di Biagio via Phabricator via llvm-commits]

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

This patch removes the following dag node opcodes from namespace X86ISD:

  RDTSC_DAG,
  RDTSCP_DAG,
  RDPMC_DAG

The logic that expands RDTSC/RDPMC/XGETBV intrinsics is basically the same. The only differences are:

- RDTSC/RDTSCP don't implicitly read ECX.
- RDTSCP also implicitly writes ECX.

I moved the common expansion logic into a helper function with the goal to get rid of code repetition.
That helper is now used for the expansion of RDTSC/RDTSCP/RDPMC/XGETBV intrinsics.

No functional change intended.


https://reviews.llvm.org/D59547

Files:
  lib/Target/X86/X86ISelLowering.cpp
  lib/Target/X86/X86ISelLowering.h
  lib/Target/X86/X86InstrInfo.td
  lib/Target/X86/X86InstrSystem.td
  lib/Target/X86/X86IntrinsicsInfo.h

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