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Merge commit 7bed381ea from llvm git (by Simon Atanasyan):

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[mips] Implement Octeon+ `saa` and `saad` instructions

  `saa` and `saad` are 32-bit and 64-bit store atomic add instructions.

     memory[base] = memory[base] + rt

  These instructions are available for "Octeon+" CPU. The patch adds
  support for both instructions to MIPS assembler and diassembler and
  introduces new CPU type - "octeon+".

  Next patches will implement `.set arch=octeon+` directive and
  `AFL_EXT_OCTEONP` ISA extension flag support.

  Differential Revision: https://reviews.llvm.org/D69849

This is one of the upstream changes needed for adding support for the
OCTEON+ CPU type, so that we can test Clang builds using the most
commonly available FreeBSD/mips64 reference platform, the Edge Router
Lite.

Requested by:	kevans
MFC after:	1 month
X-MFC-With:	r353358
This commit is contained in:
Dimitry Andric 2019-11-21 20:22:07 +00:00
parent 964c4a37b0
commit 2967f08a40
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=354979
9 changed files with 119 additions and 6 deletions
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51
contrib/llvm/lib/Target/Mips/AsmParser/MipsAsmParser.cpp
View File

@ -125,7 +125,8 @@ const FeatureBitset MipsAssemblerOptions::AllArchRelatedMask = {
Mips::FeatureMips32r3, Mips::FeatureMips32r5, Mips::FeatureMips32r6,
Mips::FeatureMips64, Mips::FeatureMips64r2, Mips::FeatureMips64r3,
Mips::FeatureMips64r5, Mips::FeatureMips64r6, Mips::FeatureCnMips,
Mips::FeatureFP64Bit, Mips::FeatureGP64Bit, Mips::FeatureNaN2008
Mips::FeatureCnMipsP, Mips::FeatureFP64Bit, Mips::FeatureGP64Bit,
Mips::FeatureNaN2008
};
namespace {
@ -324,6 +325,9 @@ class MipsAsmParser : public MCTargetAsmParser {
bool expandMXTRAlias(MCInst &Inst, SMLoc IDLoc, MCStreamer &Out,
const MCSubtargetInfo *STI);
bool expandSaaAddr(MCInst &Inst, SMLoc IDLoc, MCStreamer &Out,
const MCSubtargetInfo *STI);
bool reportParseError(Twine ErrorMsg);
bool reportParseError(SMLoc Loc, Twine ErrorMsg);
@ -648,6 +652,10 @@ class MipsAsmParser : public MCTargetAsmParser {
return (getSTI().getFeatureBits()[Mips::FeatureCnMips]);
}
bool hasCnMipsP() const {
return (getSTI().getFeatureBits()[Mips::FeatureCnMipsP]);
}
bool inPicMode() {
return IsPicEnabled;
}
@ -2584,6 +2592,9 @@ MipsAsmParser::tryExpandInstruction(MCInst &Inst, SMLoc IDLoc, MCStreamer &Out,
case Mips::MFTHC1: case Mips::MTTHC1:
case Mips::CFTC1: case Mips::CTTC1:
return expandMXTRAlias(Inst, IDLoc, Out, STI) ? MER_Fail : MER_Success;
case Mips::SaaAddr:
case Mips::SaadAddr:
return expandSaaAddr(Inst, IDLoc, Out, STI) ? MER_Fail : MER_Success;
}
}
@ -3074,7 +3085,7 @@ bool MipsAsmParser::loadAndAddSymbolAddress(const MCExpr *SymExpr,
TOut.emitRRR(Mips::DADDu, DstReg, ATReg, SrcReg, IDLoc, STI);
return false;
} else if (canUseATReg() && !RdRegIsRsReg) {
} else if (canUseATReg() && !RdRegIsRsReg && DstReg != getATReg(IDLoc)) {
unsigned ATReg = getATReg(IDLoc);
// If the $rs is different from $rd or if $rs isn't specified and we
@ -3101,7 +3112,8 @@ bool MipsAsmParser::loadAndAddSymbolAddress(const MCExpr *SymExpr,
TOut.emitRRR(Mips::DADDu, DstReg, DstReg, SrcReg, IDLoc, STI);
return false;
} else if (!canUseATReg() && !RdRegIsRsReg) {
} else if ((!canUseATReg() && !RdRegIsRsReg) ||
(canUseATReg() && DstReg == getATReg(IDLoc))) {
// Otherwise, synthesize the address in the destination register
// serially:
// (d)la $rd, sym/sym($rs) => lui $rd, %highest(sym)
@ -5359,6 +5371,39 @@ bool MipsAsmParser::expandMXTRAlias(MCInst &Inst, SMLoc IDLoc, MCStreamer &Out,
return false;
}
bool MipsAsmParser::expandSaaAddr(MCInst &Inst, SMLoc IDLoc, MCStreamer &Out,
const MCSubtargetInfo *STI) {
assert(Inst.getNumOperands() == 3 && "expected three operands");
assert(Inst.getOperand(0).isReg() && "expected register operand kind");
assert(Inst.getOperand(1).isReg() && "expected register operand kind");
warnIfNoMacro(IDLoc);
MipsTargetStreamer &TOut = getTargetStreamer();
unsigned Opcode = Inst.getOpcode() == Mips::SaaAddr ? Mips::SAA : Mips::SAAD;
unsigned RtReg = Inst.getOperand(0).getReg();
unsigned BaseReg = Inst.getOperand(1).getReg();
const MCOperand &BaseOp = Inst.getOperand(2);
if (BaseOp.isImm()) {
int64_t ImmValue = BaseOp.getImm();
if (ImmValue == 0) {
TOut.emitRR(Opcode, RtReg, BaseReg, IDLoc, STI);
return false;
}
}
unsigned ATReg = getATReg(IDLoc);
if (!ATReg)
return true;
if (expandLoadAddress(ATReg, BaseReg, BaseOp, !isGP64bit(), IDLoc, Out, STI))
return true;
TOut.emitRR(Opcode, RtReg, ATReg, IDLoc, STI);
return false;
}
unsigned
MipsAsmParser::checkEarlyTargetMatchPredicate(MCInst &Inst,
const OperandVector &Operands) {

10
contrib/llvm/lib/Target/Mips/Disassembler/MipsDisassembler.cpp
View File

@ -63,6 +63,8 @@ class MipsDisassembler : public MCDisassembler {
bool hasCnMips() const { return STI.getFeatureBits()[Mips::FeatureCnMips]; }
bool hasCnMipsP() const { return STI.getFeatureBits()[Mips::FeatureCnMipsP]; }
bool hasCOP3() const {
// Only present in MIPS-I and MIPS-II
return !hasMips32() && !hasMips3();
@ -1346,6 +1348,14 @@ DecodeStatus MipsDisassembler::getInstruction(MCInst &Instr, uint64_t &Size,
return Result;
}
if (hasCnMipsP()) {
LLVM_DEBUG(dbgs() << "Trying CnMipsP table (32-bit opcodes):\n");
Result = decodeInstruction(DecoderTableCnMipsP32, Instr, Insn,
Address, this, STI);
if (Result != MCDisassembler::Fail)
return Result;
}
if (isGP64()) {
LLVM_DEBUG(dbgs() << "Trying Mips64 (GPR64) table (32-bit opcodes):\n");
Result = decodeInstruction(DecoderTableMips6432, Instr, Insn,

5
contrib/llvm/lib/Target/Mips/Mips.td
View File

@ -193,6 +193,10 @@ def FeatureCnMips : SubtargetFeature<"cnmips", "HasCnMips",
"true", "Octeon cnMIPS Support",
[FeatureMips64r2]>;
def FeatureCnMipsP : SubtargetFeature<"cnmipsp", "HasCnMipsP",
"true", "Octeon+ cnMIPS Support",
[FeatureCnMips]>;
def FeatureUseTCCInDIV : SubtargetFeature<
"use-tcc-in-div",
"UseTCCInDIV", "false",
@ -238,6 +242,7 @@ def : Proc<"mips64r3", [FeatureMips64r3]>;
def : Proc<"mips64r5", [FeatureMips64r5]>;
def : Proc<"mips64r6", [FeatureMips64r6]>;
def : Proc<"octeon", [FeatureMips64r2, FeatureCnMips]>;
def : Proc<"octeon+", [FeatureMips64r2, FeatureCnMips, FeatureCnMipsP]>;
def : ProcessorModel<"p5600", MipsP5600Model, [ImplP5600]>;
def MipsAsmParser : AsmParser {

18
contrib/llvm/lib/Target/Mips/Mips64InstrInfo.td
View File

@ -585,6 +585,24 @@ def DMTC2_OCTEON : MFC2OP<"dmtc2", GPR64Opnd, II_DMTC2>, MFC2OP_FM<0x12, 5>,
ASE_CNMIPS;
}
// Cavium Octeon+ cnMIPS instructions
let DecoderNamespace = "CnMipsP",
// FIXME: The lack of HasStdEnc is probably a bug
EncodingPredicates = []<Predicate> in {
class Saa<string opstr>:
InstSE<(outs), (ins GPR64Opnd:$rt, GPR64Opnd:$rs),
!strconcat(opstr, "\t$rt, (${rs})"), [], NoItinerary, FrmR, opstr>;
def SAA : Saa<"saa">, SAA_FM<0x18>, ASE_CNMIPSP;
def SAAD : Saa<"saad">, SAA_FM<0x19>, ASE_CNMIPSP;
def SaaAddr : MipsAsmPseudoInst<(outs), (ins GPR64Opnd:$rt, mem:$addr),
"saa\t$rt, $addr">, ASE_CNMIPSP;
def SaadAddr : MipsAsmPseudoInst<(outs), (ins GPR64Opnd:$rt, mem:$addr),
"saad\t$rt, $addr">, ASE_CNMIPSP;
}
}
/// Move between CPU and coprocessor registers

13
contrib/llvm/lib/Target/Mips/MipsInstrFormats.td
View File

@ -626,6 +626,19 @@ class SEQI_FM<bits<6> funct> : StdArch {
let Inst{5-0} = funct;
}
class SAA_FM<bits<6> funct> : StdArch {
bits<5> rt;
bits<5> rs;
bits<32> Inst;
let Inst{31-26} = 0x1c;
let Inst{25-21} = rs;
let Inst{20-16} = rt;
let Inst{15-6} = 0;
let Inst{5-0} = funct;
}
//===----------------------------------------------------------------------===//
// System calls format <op|code_|funct>
//===----------------------------------------------------------------------===//

12
contrib/llvm/lib/Target/Mips/MipsInstrInfo.td
View File

@ -211,6 +211,10 @@ def HasCnMips : Predicate<"Subtarget->hasCnMips()">,
AssemblerPredicate<"FeatureCnMips">;
def NotCnMips : Predicate<"!Subtarget->hasCnMips()">,
AssemblerPredicate<"!FeatureCnMips">;
def HasCnMipsP : Predicate<"Subtarget->hasCnMipsP()">,
AssemblerPredicate<"FeatureCnMipsP">;
def NotCnMipsP : Predicate<"!Subtarget->hasCnMipsP()">,
AssemblerPredicate<"!FeatureCnMipsP">;
def IsSym32 : Predicate<"Subtarget->HasSym32()">,
AssemblerPredicate<"FeatureSym32">;
def IsSym64 : Predicate<"!Subtarget->HasSym32()">,
@ -439,6 +443,14 @@ class NOT_ASE_CNMIPS {
list<Predicate> ASEPredicate = [NotCnMips];
}
class ASE_CNMIPSP {
list<Predicate> ASEPredicate = [HasCnMipsP];
}
class NOT_ASE_CNMIPSP {
list<Predicate> ASEPredicate = [NotCnMipsP];
}
class ASE_MIPS64_CNMIPS {
list<Predicate> ASEPredicate = [HasMips64, HasCnMips];
}

9
contrib/llvm/lib/Target/Mips/MipsScheduleGeneric.td
View File

@ -720,11 +720,16 @@ def : InstRW<[GenericWriteALU], (instrs BADDu, BBIT0, BBIT032, BBIT1, BBIT132,
CINS, CINS32, CINS64_32, CINS_i32,
DMFC2_OCTEON, DMTC2_OCTEON, DPOP, EXTS,
EXTS32, MTM0, MTM1, MTM2, MTP0, MTP1, MTP2,
POP, SEQ, SEQi, SNE, SNEi, V3MULU, VMM0,
VMULU)>;
POP, SEQ, SEQi, SNE, SNEi,
V3MULU, VMM0, VMULU)>;
def : InstRW<[GenericWriteMDUtoGPR], (instrs DMUL)>;
// Cavium Networks MIPS (cnMIPSP) - Octeon+, HasCnMipsP
// =================================================
def : InstRW<[GenericWriteALU], (instrs SAA, SAAD)>;
// FPU Pipelines
// =============

3
contrib/llvm/lib/Target/Mips/MipsScheduleP5600.td
View File

@ -18,7 +18,8 @@ def MipsP5600Model : SchedMachineModel {
list<Predicate> UnsupportedFeatures = [HasMips3, HasMips32r6, HasMips64,
HasMips64r2, HasMips64r5, HasMips64r6,
IsGP64bit, IsPTR64bit,
InMicroMips, InMips16Mode, HasCnMips,
InMicroMips, InMips16Mode,
HasCnMips, HasCnMipsP,
HasDSP, HasDSPR2, HasMT, HasCRC];
}

4
contrib/llvm/lib/Target/Mips/MipsSubtarget.h
View File

@ -111,6 +111,9 @@ class MipsSubtarget : public MipsGenSubtargetInfo {
// CPU supports cnMIPS (Cavium Networks Octeon CPU).
bool HasCnMips;
// CPU supports cnMIPSP (Cavium Networks Octeon+ CPU).
bool HasCnMipsP;
// isLinux - Target system is Linux. Is false we consider ELFOS for now.
bool IsLinux;
@ -267,6 +270,7 @@ class MipsSubtarget : public MipsGenSubtargetInfo {
bool hasMips64r6() const { return MipsArchVersion >= Mips64r6; }
bool hasCnMips() const { return HasCnMips; }
bool hasCnMipsP() const { return HasCnMipsP; }
bool isLittle() const { return IsLittle; }
bool isABICalls() const { return !NoABICalls; }