X86: add GATHER intrinsics (AVX2) in LLVM
Support the following intrinsics:
llvm.x86.avx2.gather.d.pd, llvm.x86.avx2.gather.q.pd
llvm.x86.avx2.gather.d.pd.256, llvm.x86.avx2.gather.q.pd.256
llvm.x86.avx2.gather.d.ps, llvm.x86.avx2.gather.q.ps
llvm.x86.avx2.gather.d.ps.256, llvm.x86.avx2.gather.q.ps.256
Modified Disassembler to handle VSIB addressing mode.
llvm-svn: 159221
diff --git a/llvm/lib/Target/X86/Disassembler/X86Disassembler.cpp b/llvm/lib/Target/X86/Disassembler/X86Disassembler.cpp
index b13a006..b13e1ca 100644
--- a/llvm/lib/Target/X86/Disassembler/X86Disassembler.cpp
+++ b/llvm/lib/Target/X86/Disassembler/X86Disassembler.cpp
@@ -498,7 +498,30 @@
} 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 @@
indexReg = MCOperand::CreateReg(X86::x); break;
EA_BASES_32BIT
EA_BASES_64BIT
+ REGS_XMM
+ REGS_YMM
#undef ENTRY
}
} else {