Commit eb054577 authored by Shengchen Kan's avatar Shengchen Kan
Browse files

[X86] Add function isPrefix() 

Currently some prefixes are emitted as instructions, to distinguish them
from real instruction, fuction isPrefix() is added. The kinds of prefix
are consistent with X86GenInstrInfo.inc.

Differential Revision: https://reviews.llvm.org/D73013
parent 0e672124

llvm/lib/Target/X86/MCTargetDesc/X86BaseInfo.h

+27 −0
Original line number Diff line number Diff line
@@ -346,6 +346,33 @@ namespace X86 { 
    llvm_unreachable("unknown fusion type");

  }



  /// \returns true if the instruction with given opcode is a prefix.

  inline bool isPrefix(unsigned Opcode) {

    switch (Opcode) {

    default:

      return false;

      // segment override prefix

    case X86::CS_PREFIX:

    case X86::DS_PREFIX:

    case X86::ES_PREFIX:

    case X86::FS_PREFIX:

    case X86::GS_PREFIX:

    case X86::SS_PREFIX:

      // operand-size override prefix

    case X86::DATA16_PREFIX:

      // lock and repeat prefix

    case X86::LOCK_PREFIX:

    case X86::REPNE_PREFIX:

    case X86::REP_PREFIX:

      // rex64 prefix

    case X86::REX64_PREFIX:

      // acquire and release prefix

    case X86::XACQUIRE_PREFIX:

    case X86::XRELEASE_PREFIX:

      return true;

    }

  }



  /// Defines the possible values of the branch boundary alignment mask.

  enum AlignBranchBoundaryKind : uint8_t {

    AlignBranchNone = 0,