diff options
Diffstat (limited to 'llvm/lib/Target/X86/Disassembler')
| -rw-r--r-- | llvm/lib/Target/X86/Disassembler/X86Disassembler.cpp | 27 | ||||
| -rw-r--r-- | llvm/lib/Target/X86/Disassembler/X86DisassemblerDecoder.h | 3 |
2 files changed, 29 insertions, 1 deletions
diff --git a/llvm/lib/Target/X86/Disassembler/X86Disassembler.cpp b/llvm/lib/Target/X86/Disassembler/X86Disassembler.cpp index b13a00620bb..b13e1ca41c5 100644 --- a/llvm/lib/Target/X86/Disassembler/X86Disassembler.cpp +++ b/llvm/lib/Target/X86/Disassembler/X86Disassembler.cpp @@ -498,7 +498,30 @@ static bool translateRMMemory(MCInst &mcInst, InternalInstruction &insn, } else { baseReg = MCOperand::CreateReg(0); } - + + // Check whether we are handling VSIB addressing mode for GATHER. + // If sibIndex was set to SIB_INDEX_NONE, index offset is 4 and + // we should use SIB_INDEX_XMM4|YMM4 for VSIB. + // I don't see a way to get the correct IndexReg in readSIB: + // We can tell whether it is VSIB or SIB after instruction ID is decoded, + // but instruction ID may not be decoded yet when calling readSIB. + uint32_t Opcode = mcInst.getOpcode(); + bool IsGather = (Opcode == X86::VGATHERDPDrm || + Opcode == X86::VGATHERQPDrm || + Opcode == X86::VGATHERDPSrm || + Opcode == X86::VGATHERQPSrm); + bool IsGatherY = (Opcode == X86::VGATHERDPDYrm || + Opcode == X86::VGATHERQPDYrm || + Opcode == X86::VGATHERDPSYrm || + Opcode == X86::VGATHERQPSYrm); + if (IsGather || IsGatherY) { + unsigned IndexOffset = insn.sibIndex - + (insn.addressSize == 8 ? SIB_INDEX_RAX:SIB_INDEX_EAX); + SIBIndex IndexBase = IsGatherY ? SIB_INDEX_YMM0 : SIB_INDEX_XMM0; + insn.sibIndex = (SIBIndex)(IndexBase + + (insn.sibIndex == SIB_INDEX_NONE ? 4 : IndexOffset)); + } + if (insn.sibIndex != SIB_INDEX_NONE) { switch (insn.sibIndex) { default: @@ -509,6 +532,8 @@ static bool translateRMMemory(MCInst &mcInst, InternalInstruction &insn, indexReg = MCOperand::CreateReg(X86::x); break; EA_BASES_32BIT EA_BASES_64BIT + REGS_XMM + REGS_YMM #undef ENTRY } } else { diff --git a/llvm/lib/Target/X86/Disassembler/X86DisassemblerDecoder.h b/llvm/lib/Target/X86/Disassembler/X86DisassemblerDecoder.h index fae309b45d0..e2caf6a2a8b 100644 --- a/llvm/lib/Target/X86/Disassembler/X86DisassemblerDecoder.h +++ b/llvm/lib/Target/X86/Disassembler/X86DisassemblerDecoder.h @@ -310,11 +310,14 @@ typedef enum { * SIBIndex - All possible values of the SIB index field. * Borrows entries from ALL_EA_BASES with the special case that * sib is synonymous with NONE. + * Vector SIB: index can be XMM or YMM. */ typedef enum { SIB_INDEX_NONE, #define ENTRY(x) SIB_INDEX_##x, ALL_EA_BASES + REGS_XMM + REGS_YMM #undef ENTRY SIB_INDEX_max } SIBIndex; |
