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ARMInstrThumb.td
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ARMInstrThumb.td
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//===-- ARMInstrThumb.td - Thumb support for ARM -----------*- tablegen -*-===//
//
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
// See https://llvm.org/LICENSE.txt for license information.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
//
//===----------------------------------------------------------------------===//
//
// This file describes the Thumb instruction set.
//
//===----------------------------------------------------------------------===//
//===----------------------------------------------------------------------===//
// Thumb specific DAG Nodes.
//
def ARMtsecall : SDNode<"ARMISD::tSECALL", SDT_ARMcall,
[SDNPHasChain, SDNPOptInGlue, SDNPOutGlue,
SDNPVariadic]>;
def imm_sr_XFORM: SDNodeXForm<imm, [{
unsigned Imm = N->getZExtValue();
return CurDAG->getTargetConstant((Imm == 32 ? 0 : Imm), SDLoc(N), MVT::i32);
}]>;
def ThumbSRImmAsmOperand: ImmAsmOperand<1,32> { let Name = "ImmThumbSR"; }
def imm_sr : Operand<i32>, PatLeaf<(imm), [{
uint64_t Imm = N->getZExtValue();
return Imm > 0 && Imm <= 32;
}], imm_sr_XFORM> {
let PrintMethod = "printThumbSRImm";
let ParserMatchClass = ThumbSRImmAsmOperand;
}
def imm0_7_neg : PatLeaf<(i32 imm), [{
return (uint32_t)-N->getZExtValue() < 8;
}], imm_neg_XFORM>;
def ThumbModImmNeg1_7AsmOperand : AsmOperandClass { let Name = "ThumbModImmNeg1_7"; }
def mod_imm1_7_neg : Operand<i32>, PatLeaf<(imm), [{
unsigned Value = -(unsigned)N->getZExtValue();
return 0 < Value && Value < 8;
}], imm_neg_XFORM> {
let ParserMatchClass = ThumbModImmNeg1_7AsmOperand;
}
def ThumbModImmNeg8_255AsmOperand : AsmOperandClass { let Name = "ThumbModImmNeg8_255"; }
def mod_imm8_255_neg : Operand<i32>, PatLeaf<(imm), [{
unsigned Value = -(unsigned)N->getZExtValue();
return 7 < Value && Value < 256;
}], imm_neg_XFORM> {
let ParserMatchClass = ThumbModImmNeg8_255AsmOperand;
}
def imm0_255_comp : PatLeaf<(i32 imm), [{
return ~((uint32_t)N->getZExtValue()) < 256;
}]>;
def imm8_255_neg : PatLeaf<(i32 imm), [{
unsigned Val = -N->getZExtValue();
return Val >= 8 && Val < 256;
}], imm_neg_XFORM>;
// Break imm's up into two pieces: an immediate + a left shift. This uses
// thumb_immshifted to match and thumb_immshifted_val and thumb_immshifted_shamt
// to get the val/shift pieces.
def thumb_immshifted : PatLeaf<(imm), [{
return ARM_AM::isThumbImmShiftedVal((unsigned)N->getZExtValue());
}]>;
def thumb_immshifted_val : SDNodeXForm<imm, [{
unsigned V = ARM_AM::getThumbImmNonShiftedVal((unsigned)N->getZExtValue());
return CurDAG->getTargetConstant(V, SDLoc(N), MVT::i32);
}]>;
def thumb_immshifted_shamt : SDNodeXForm<imm, [{
unsigned V = ARM_AM::getThumbImmValShift((unsigned)N->getZExtValue());
return CurDAG->getTargetConstant(V, SDLoc(N), MVT::i32);
}]>;
def imm256_510 : ImmLeaf<i32, [{
return Imm >= 256 && Imm < 511;
}]>;
def thumb_imm256_510_addend : SDNodeXForm<imm, [{
return CurDAG->getTargetConstant(N->getZExtValue() - 255, SDLoc(N), MVT::i32);
}]>;
// Scaled 4 immediate.
def t_imm0_1020s4_asmoperand: AsmOperandClass { let Name = "Imm0_1020s4"; }
def t_imm0_1020s4 : Operand<i32> {
let PrintMethod = "printThumbS4ImmOperand";
let ParserMatchClass = t_imm0_1020s4_asmoperand;
let OperandType = "OPERAND_IMMEDIATE";
}
def t_imm0_508s4_asmoperand: AsmOperandClass { let Name = "Imm0_508s4"; }
def t_imm0_508s4 : Operand<i32> {
let PrintMethod = "printThumbS4ImmOperand";
let ParserMatchClass = t_imm0_508s4_asmoperand;
let OperandType = "OPERAND_IMMEDIATE";
}
// Alias use only, so no printer is necessary.
def t_imm0_508s4_neg_asmoperand: AsmOperandClass { let Name = "Imm0_508s4Neg"; }
def t_imm0_508s4_neg : Operand<i32> {
let ParserMatchClass = t_imm0_508s4_neg_asmoperand;
let OperandType = "OPERAND_IMMEDIATE";
}
// Define Thumb specific addressing modes.
// unsigned 8-bit, 2-scaled memory offset
class OperandUnsignedOffset_b8s2 : AsmOperandClass {
let Name = "UnsignedOffset_b8s2";
let PredicateMethod = "isUnsignedOffset<8, 2>";
}
def UnsignedOffset_b8s2 : OperandUnsignedOffset_b8s2;
// thumb style PC relative operand. signed, 8 bits magnitude,
// two bits shift. can be represented as either [pc, #imm], #imm,
// or relocatable expression...
def ThumbMemPC : AsmOperandClass {
let Name = "ThumbMemPC";
}
let OperandType = "OPERAND_PCREL" in {
def t_brtarget : Operand<OtherVT> {
let EncoderMethod = "getThumbBRTargetOpValue";
let DecoderMethod = "DecodeThumbBROperand";
}
// ADR instruction labels.
def t_adrlabel : Operand<i32> {
let EncoderMethod = "getThumbAdrLabelOpValue";
let PrintMethod = "printAdrLabelOperand<2>";
let ParserMatchClass = UnsignedOffset_b8s2;
}
def thumb_br_target : Operand<OtherVT> {
let ParserMatchClass = ThumbBranchTarget;
let EncoderMethod = "getThumbBranchTargetOpValue";
let OperandType = "OPERAND_PCREL";
}
def thumb_bl_target : Operand<i32> {
let ParserMatchClass = ThumbBranchTarget;
let EncoderMethod = "getThumbBLTargetOpValue";
let DecoderMethod = "DecodeThumbBLTargetOperand";
}
// Target for BLX *from* thumb mode.
def thumb_blx_target : Operand<i32> {
let ParserMatchClass = ARMBranchTarget;
let EncoderMethod = "getThumbBLXTargetOpValue";
let DecoderMethod = "DecodeThumbBLXOffset";
}
def thumb_bcc_target : Operand<OtherVT> {
let ParserMatchClass = ThumbBranchTarget;
let EncoderMethod = "getThumbBCCTargetOpValue";
let DecoderMethod = "DecodeThumbBCCTargetOperand";
}
def thumb_cb_target : Operand<OtherVT> {
let ParserMatchClass = ThumbBranchTarget;
let EncoderMethod = "getThumbCBTargetOpValue";
let DecoderMethod = "DecodeThumbCmpBROperand";
}
} // OperandType = "OPERAND_PCREL"
// t_addrmode_pc := <label> => pc + imm8 * 4
//
def t_addrmode_pc : MemOperand {
let EncoderMethod = "getAddrModePCOpValue";
let DecoderMethod = "DecodeThumbAddrModePC";
let PrintMethod = "printThumbLdrLabelOperand";
let ParserMatchClass = ThumbMemPC;
}
// t_addrmode_rr := reg + reg
//
def t_addrmode_rr_asm_operand : AsmOperandClass { let Name = "MemThumbRR"; }
def t_addrmode_rr : MemOperand,
ComplexPattern<i32, 2, "SelectThumbAddrModeRR", []> {
let EncoderMethod = "getThumbAddrModeRegRegOpValue";
let PrintMethod = "printThumbAddrModeRROperand";
let DecoderMethod = "DecodeThumbAddrModeRR";
let ParserMatchClass = t_addrmode_rr_asm_operand;
let MIOperandInfo = (ops tGPR:$base, tGPR:$offsreg);
}
// t_addrmode_rr_sext := reg + reg
//
// This is similar to t_addrmode_rr, but uses different heuristics for
// ldrsb/ldrsh.
def t_addrmode_rr_sext : MemOperand,
ComplexPattern<i32, 2, "SelectThumbAddrModeRRSext", []> {
let EncoderMethod = "getThumbAddrModeRegRegOpValue";
let PrintMethod = "printThumbAddrModeRROperand";
let DecoderMethod = "DecodeThumbAddrModeRR";
let ParserMatchClass = t_addrmode_rr_asm_operand;
let MIOperandInfo = (ops tGPR:$base, tGPR:$offsreg);
}
// t_addrmode_rrs := reg + reg
//
// We use separate scaled versions because the Select* functions need
// to explicitly check for a matching constant and return false here so that
// the reg+imm forms will match instead. This is a horrible way to do that,
// as it forces tight coupling between the methods, but it's how selectiondag
// currently works.
def t_addrmode_rrs1 : MemOperand,
ComplexPattern<i32, 2, "SelectThumbAddrModeRI5S1", []> {
let EncoderMethod = "getThumbAddrModeRegRegOpValue";
let PrintMethod = "printThumbAddrModeRROperand";
let DecoderMethod = "DecodeThumbAddrModeRR";
let ParserMatchClass = t_addrmode_rr_asm_operand;
let MIOperandInfo = (ops tGPR:$base, tGPR:$offsreg);
}
def t_addrmode_rrs2 : MemOperand,
ComplexPattern<i32, 2, "SelectThumbAddrModeRI5S2", []> {
let EncoderMethod = "getThumbAddrModeRegRegOpValue";
let DecoderMethod = "DecodeThumbAddrModeRR";
let PrintMethod = "printThumbAddrModeRROperand";
let ParserMatchClass = t_addrmode_rr_asm_operand;
let MIOperandInfo = (ops tGPR:$base, tGPR:$offsreg);
}
def t_addrmode_rrs4 : MemOperand,
ComplexPattern<i32, 2, "SelectThumbAddrModeRI5S4", []> {
let EncoderMethod = "getThumbAddrModeRegRegOpValue";
let DecoderMethod = "DecodeThumbAddrModeRR";
let PrintMethod = "printThumbAddrModeRROperand";
let ParserMatchClass = t_addrmode_rr_asm_operand;
let MIOperandInfo = (ops tGPR:$base, tGPR:$offsreg);
}
// t_addrmode_is4 := reg + imm5 * 4
//
def t_addrmode_is4_asm_operand : AsmOperandClass { let Name = "MemThumbRIs4"; }
def t_addrmode_is4 : MemOperand,
ComplexPattern<i32, 2, "SelectThumbAddrModeImm5S4", []> {
let EncoderMethod = "getAddrModeISOpValue";
let DecoderMethod = "DecodeThumbAddrModeIS";
let PrintMethod = "printThumbAddrModeImm5S4Operand";
let ParserMatchClass = t_addrmode_is4_asm_operand;
let MIOperandInfo = (ops tGPR:$base, i32imm:$offsimm);
}
// t_addrmode_is2 := reg + imm5 * 2
//
def t_addrmode_is2_asm_operand : AsmOperandClass { let Name = "MemThumbRIs2"; }
def t_addrmode_is2 : MemOperand,
ComplexPattern<i32, 2, "SelectThumbAddrModeImm5S2", []> {
let EncoderMethod = "getAddrModeISOpValue";
let DecoderMethod = "DecodeThumbAddrModeIS";
let PrintMethod = "printThumbAddrModeImm5S2Operand";
let ParserMatchClass = t_addrmode_is2_asm_operand;
let MIOperandInfo = (ops tGPR:$base, i32imm:$offsimm);
}
// t_addrmode_is1 := reg + imm5
//
def t_addrmode_is1_asm_operand : AsmOperandClass { let Name = "MemThumbRIs1"; }
def t_addrmode_is1 : MemOperand,
ComplexPattern<i32, 2, "SelectThumbAddrModeImm5S1", []> {
let EncoderMethod = "getAddrModeISOpValue";
let DecoderMethod = "DecodeThumbAddrModeIS";
let PrintMethod = "printThumbAddrModeImm5S1Operand";
let ParserMatchClass = t_addrmode_is1_asm_operand;
let MIOperandInfo = (ops tGPR:$base, i32imm:$offsimm);
}
// t_addrmode_sp := sp + imm8 * 4
//
// FIXME: This really shouldn't have an explicit SP operand at all. It should
// be implicit, just like in the instruction encoding itself.
def t_addrmode_sp_asm_operand : AsmOperandClass { let Name = "MemThumbSPI"; }
def t_addrmode_sp : MemOperand,
ComplexPattern<i32, 2, "SelectThumbAddrModeSP", []> {
let EncoderMethod = "getAddrModeThumbSPOpValue";
let DecoderMethod = "DecodeThumbAddrModeSP";
let PrintMethod = "printThumbAddrModeSPOperand";
let ParserMatchClass = t_addrmode_sp_asm_operand;
let MIOperandInfo = (ops GPR:$base, i32imm:$offsimm);
}
// Inspects parent to determine whether an or instruction can be implemented as
// an add (i.e. whether we know overflow won't occur in the add).
def AddLikeOrOp : ComplexPattern<i32, 1, "SelectAddLikeOr", [],
[SDNPWantParent]>;
// Pattern to exclude immediates from matching
def non_imm32 : PatLeaf<(i32 GPR), [{ return !isa<ConstantSDNode>(N); }]>;
//===----------------------------------------------------------------------===//
// Miscellaneous Instructions.
//
// FIXME: Marking these as hasSideEffects is necessary to prevent machine DCE
// from removing one half of the matched pairs. That breaks PEI, which assumes
// these will always be in pairs, and asserts if it finds otherwise. Better way?
let Defs = [SP], Uses = [SP], hasSideEffects = 1 in {
def tADJCALLSTACKUP :
PseudoInst<(outs), (ins i32imm:$amt1, i32imm:$amt2), NoItinerary,
[(ARMcallseq_end imm:$amt1, imm:$amt2)]>,
Requires<[IsThumb, IsThumb1Only]>;
def tADJCALLSTACKDOWN :
PseudoInst<(outs), (ins i32imm:$amt, i32imm:$amt2), NoItinerary,
[(ARMcallseq_start imm:$amt, imm:$amt2)]>,
Requires<[IsThumb, IsThumb1Only]>;
}
class T1SystemEncoding<bits<8> opc>
: T1Encoding<0b101111> {
let Inst{9-8} = 0b11;
let Inst{7-0} = opc;
}
def tHINT : T1pI<(outs), (ins imm0_15:$imm), NoItinerary, "hint", "\t$imm",
[(int_arm_hint imm0_15:$imm)]>,
T1SystemEncoding<0x00>,
Requires<[IsThumb, HasV6M]> {
bits<4> imm;
let Inst{7-4} = imm;
}
// Note: When EmitPriority == 1, the alias will be used for printing
class tHintAlias<string Asm, dag Result, bit EmitPriority = 0> : tInstAlias<Asm, Result, EmitPriority> {
let Predicates = [IsThumb, HasV6M];
}
def : tHintAlias<"nop$p", (tHINT 0, pred:$p), 1>; // A8.6.110
def : tHintAlias<"yield$p", (tHINT 1, pred:$p), 1>; // A8.6.410
def : tHintAlias<"wfe$p", (tHINT 2, pred:$p), 1>; // A8.6.408
def : tHintAlias<"wfi$p", (tHINT 3, pred:$p), 1>; // A8.6.409
def : tHintAlias<"sev$p", (tHINT 4, pred:$p), 1>; // A8.6.157
def : tInstAlias<"sevl$p", (tHINT 5, pred:$p), 1> {
let Predicates = [IsThumb2, HasV8];
}
// The imm operand $val can be used by a debugger to store more information
// about the breakpoint.
def tBKPT : T1I<(outs), (ins imm0_255:$val), NoItinerary, "bkpt\t$val",
[]>,
T1Encoding<0b101111> {
let Inst{9-8} = 0b10;
// A8.6.22
bits<8> val;
let Inst{7-0} = val;
}
// default immediate for breakpoint mnemonic
def : InstAlias<"bkpt", (tBKPT 0), 0>, Requires<[IsThumb]>;
def tHLT : T1I<(outs), (ins imm0_63:$val), NoItinerary, "hlt\t$val",
[]>, T1Encoding<0b101110>, Requires<[IsThumb, HasV8]> {
let Inst{9-6} = 0b1010;
bits<6> val;
let Inst{5-0} = val;
}
def tSETEND : T1I<(outs), (ins setend_op:$end), NoItinerary, "setend\t$end",
[]>, T1Encoding<0b101101>, Requires<[IsThumb, IsNotMClass]>, Deprecated<HasV8Ops> {
bits<1> end;
// A8.6.156
let Inst{9-5} = 0b10010;
let Inst{4} = 1;
let Inst{3} = end;
let Inst{2-0} = 0b000;
}
// Change Processor State is a system instruction -- for disassembly only.
def tCPS : T1I<(outs), (ins imod_op:$imod, iflags_op:$iflags),
NoItinerary, "cps$imod $iflags", []>,
T1Misc<0b0110011> {
// A8.6.38 & B6.1.1
bit imod;
bits<3> iflags;
let Inst{4} = imod;
let Inst{3} = 0;
let Inst{2-0} = iflags;
let DecoderMethod = "DecodeThumbCPS";
}
// For both thumb1 and thumb2.
let isNotDuplicable = 1, isCodeGenOnly = 1 in
def tPICADD : TIt<(outs GPR:$dst), (ins GPR:$lhs, pclabel:$cp), IIC_iALUr, "",
[(set GPR:$dst, (ARMpic_add GPR:$lhs, imm:$cp))]>,
T1Special<{0,0,?,?}>, Sched<[WriteALU]> {
// A8.6.6
bits<3> dst;
let Inst{6-3} = 0b1111; // Rm = pc
let Inst{2-0} = dst;
}
// ADD <Rd>, sp, #<imm8>
// FIXME: This should not be marked as having side effects, and it should be
// rematerializable. Clearing the side effect bit causes miscompilations,
// probably because the instruction can be moved around.
def tADDrSPi : T1pI<(outs tGPR:$dst), (ins GPRsp:$sp, t_imm0_1020s4:$imm),
IIC_iALUi, "add", "\t$dst, $sp, $imm", []>,
T1Encoding<{1,0,1,0,1,?}>, Sched<[WriteALU]> {
// A6.2 & A8.6.8
bits<3> dst;
bits<8> imm;
let Inst{10-8} = dst;
let Inst{7-0} = imm;
let DecoderMethod = "DecodeThumbAddSpecialReg";
}
// Thumb1 frame lowering is rather fragile, we hope to be able to use
// tADDrSPi, but we may need to insert a sequence that clobbers CPSR.
def tADDframe : PseudoInst<(outs tGPR:$dst), (ins i32imm:$base, i32imm:$offset),
NoItinerary, []>,
Requires<[IsThumb, IsThumb1Only]> {
let Defs = [CPSR];
}
// ADD sp, sp, #<imm7>
def tADDspi : T1pIt<(outs GPRsp:$Rdn), (ins GPRsp:$Rn, t_imm0_508s4:$imm),
IIC_iALUi, "add", "\t$Rdn, $imm", []>,
T1Misc<{0,0,0,0,0,?,?}>, Sched<[WriteALU]> {
// A6.2.5 & A8.6.8
bits<7> imm;
let Inst{6-0} = imm;
let DecoderMethod = "DecodeThumbAddSPImm";
}
// SUB sp, sp, #<imm7>
// FIXME: The encoding and the ASM string don't match up.
def tSUBspi : T1pIt<(outs GPRsp:$Rdn), (ins GPRsp:$Rn, t_imm0_508s4:$imm),
IIC_iALUi, "sub", "\t$Rdn, $imm", []>,
T1Misc<{0,0,0,0,1,?,?}>, Sched<[WriteALU]> {
// A6.2.5 & A8.6.214
bits<7> imm;
let Inst{6-0} = imm;
let DecoderMethod = "DecodeThumbAddSPImm";
}
def : tInstSubst<"add${p} sp, $imm",
(tSUBspi SP, t_imm0_508s4_neg:$imm, pred:$p)>;
def : tInstSubst<"add${p} sp, sp, $imm",
(tSUBspi SP, t_imm0_508s4_neg:$imm, pred:$p)>;
// Can optionally specify SP as a three operand instruction.
def : tInstAlias<"add${p} sp, sp, $imm",
(tADDspi SP, t_imm0_508s4:$imm, pred:$p)>;
def : tInstAlias<"sub${p} sp, sp, $imm",
(tSUBspi SP, t_imm0_508s4:$imm, pred:$p)>;
// ADD <Rm>, sp
def tADDrSP : T1pI<(outs GPR:$Rdn), (ins GPRsp:$sp, GPR:$Rn), IIC_iALUr,
"add", "\t$Rdn, $sp, $Rn", []>,
T1Special<{0,0,?,?}>, Sched<[WriteALU]> {
// A8.6.9 Encoding T1
bits<4> Rdn;
let Inst{7} = Rdn{3};
let Inst{6-3} = 0b1101;
let Inst{2-0} = Rdn{2-0};
let DecoderMethod = "DecodeThumbAddSPReg";
}
// ADD sp, <Rm>
def tADDspr : T1pIt<(outs GPRsp:$Rdn), (ins GPRsp:$Rn, GPR:$Rm), IIC_iALUr,
"add", "\t$Rdn, $Rm", []>,
T1Special<{0,0,?,?}>, Sched<[WriteALU]> {
// A8.6.9 Encoding T2
bits<4> Rm;
let Inst{7} = 1;
let Inst{6-3} = Rm;
let Inst{2-0} = 0b101;
let DecoderMethod = "DecodeThumbAddSPReg";
}
//===----------------------------------------------------------------------===//
// Control Flow Instructions.
//
// Indirect branches
let isBranch = 1, isTerminator = 1, isBarrier = 1, isIndirectBranch = 1 in {
def tBX : TI<(outs), (ins GPR:$Rm, pred:$p), IIC_Br, "bx${p}\t$Rm", []>,
T1Special<{1,1,0,?}>, Sched<[WriteBr]> {
// A6.2.3 & A8.6.25
bits<4> Rm;
let Inst{6-3} = Rm;
let Inst{2-0} = 0b000;
let Unpredictable{2-0} = 0b111;
}
def tBXNS : TI<(outs), (ins GPR:$Rm, pred:$p), IIC_Br, "bxns${p}\t$Rm", []>,
Requires<[IsThumb, Has8MSecExt]>,
T1Special<{1,1,0,?}>, Sched<[WriteBr]> {
bits<4> Rm;
let Inst{6-3} = Rm;
let Inst{2-0} = 0b100;
let Unpredictable{1-0} = 0b11;
}
}
let isReturn = 1, isTerminator = 1, isBarrier = 1 in {
def tBX_RET : tPseudoExpand<(outs), (ins pred:$p), 2, IIC_Br,
[(ARMretflag)], (tBX LR, pred:$p)>, Sched<[WriteBr]>;
// alternative return for CMSE entry functions
def tBXNS_RET : tPseudoInst<(outs), (ins), 2, IIC_Br,
[(ARMseretflag)]>, Sched<[WriteBr]>;
// Alternative return instruction used by vararg functions.
def tBX_RET_vararg : tPseudoExpand<(outs), (ins tGPR:$Rm, pred:$p),
2, IIC_Br, [],
(tBX GPR:$Rm, pred:$p)>, Sched<[WriteBr]>;
}
// All calls clobber the non-callee saved registers. SP is marked as a use to
// prevent stack-pointer assignments that appear immediately before calls from
// potentially appearing dead.
let isCall = 1,
Defs = [LR], Uses = [SP] in {
// Also used for Thumb2
def tBL : TIx2<0b11110, 0b11, 1,
(outs), (ins pred:$p, thumb_bl_target:$func), IIC_Br,
"bl${p}\t$func",
[(ARMcall tglobaladdr:$func)]>,
Requires<[IsThumb]>, Sched<[WriteBrL]> {
bits<24> func;
let Inst{26} = func{23};
let Inst{25-16} = func{20-11};
let Inst{13} = func{22};
let Inst{11} = func{21};
let Inst{10-0} = func{10-0};
}
// ARMv5T and above, also used for Thumb2
def tBLXi : TIx2<0b11110, 0b11, 0,
(outs), (ins pred:$p, thumb_blx_target:$func), IIC_Br,
"blx${p}\t$func", []>,
Requires<[IsThumb, HasV5T, IsNotMClass]>, Sched<[WriteBrL]> {
bits<24> func;
let Inst{26} = func{23};
let Inst{25-16} = func{20-11};
let Inst{13} = func{22};
let Inst{11} = func{21};
let Inst{10-1} = func{10-1};
let Inst{0} = 0; // func{0} is assumed zero
}
// Also used for Thumb2
def tBLXr : TI<(outs), (ins pred:$p, GPR:$func), IIC_Br,
"blx${p}\t$func", []>,
Requires<[IsThumb, HasV5T]>,
T1Special<{1,1,1,?}>, Sched<[WriteBrL]> { // A6.2.3 & A8.6.24;
bits<4> func;
let Inst{6-3} = func;
let Inst{2-0} = 0b000;
}
def tBLXr_noip : ARMPseudoExpand<(outs), (ins pred:$p, GPRnoip:$func),
2, IIC_Br, [], (tBLXr pred:$p, GPR:$func)>,
Requires<[IsThumb, HasV5T]>,
Sched<[WriteBrL]>;
// ARMv8-M Security Extensions
def tBLXNSr : TI<(outs), (ins pred:$p, GPRnopc:$func), IIC_Br,
"blxns${p}\t$func", []>,
Requires<[IsThumb, Has8MSecExt]>,
T1Special<{1,1,1,?}>, Sched<[WriteBrL]> {
bits<4> func;
let Inst{6-3} = func;
let Inst{2-0} = 0b100;
let Unpredictable{1-0} = 0b11;
}
def tBLXNS_CALL : PseudoInst<(outs), (ins GPRnopc:$func), IIC_Br,
[(ARMtsecall GPRnopc:$func)]>,
Requires<[IsThumb, Has8MSecExt]>, Sched<[WriteBr]>;
// ARMv4T
def tBX_CALL : tPseudoInst<(outs), (ins tGPR:$func),
4, IIC_Br,
[(ARMcall_nolink tGPR:$func)]>,
Requires<[IsThumb, IsThumb1Only]>, Sched<[WriteBr]>;
// Also used for Thumb2
// push lr before the call
def tBL_PUSHLR : tPseudoInst<(outs), (ins GPRlr:$ra, pred:$p, thumb_bl_target:$func),
4, IIC_Br,
[]>,
Requires<[IsThumb]>, Sched<[WriteBr]>;
}
def : ARMPat<(ARMcall GPR:$func), (tBLXr $func)>,
Requires<[IsThumb, HasV5T, NoSLSBLRMitigation]>;
def : ARMPat<(ARMcall GPRnoip:$func), (tBLXr_noip $func)>,
Requires<[IsThumb, HasV5T, SLSBLRMitigation]>;
let isBranch = 1, isTerminator = 1, isBarrier = 1 in {
let isPredicable = 1 in
def tB : T1pI<(outs), (ins t_brtarget:$target), IIC_Br,
"b", "\t$target", [(br bb:$target)]>,
T1Encoding<{1,1,1,0,0,?}>, Sched<[WriteBr]> {
bits<11> target;
let Inst{10-0} = target;
let AsmMatchConverter = "cvtThumbBranches";
}
// Far jump
// Just a pseudo for a tBL instruction. Needed to let regalloc know about
// the clobber of LR.
let Defs = [LR] in
def tBfar : tPseudoExpand<(outs), (ins thumb_bl_target:$target, pred:$p),
4, IIC_Br, [],
(tBL pred:$p, thumb_bl_target:$target)>,
Sched<[WriteBrTbl]>;
def tBR_JTr : tPseudoInst<(outs),
(ins tGPR:$target, i32imm:$jt),
0, IIC_Br,
[(ARMbrjt tGPR:$target, tjumptable:$jt)]>,
Sched<[WriteBrTbl]> {
let Size = 2;
let isNotDuplicable = 1;
list<Predicate> Predicates = [IsThumb, IsThumb1Only];
}
}
// FIXME: should be able to write a pattern for ARMBrcond, but can't use
// a two-value operand where a dag node expects two operands. :(
let isBranch = 1, isTerminator = 1 in
def tBcc : T1I<(outs), (ins thumb_bcc_target:$target, pred:$p), IIC_Br,
"b${p}\t$target",
[/*(ARMbrcond bb:$target, imm:$cc)*/]>,
T1BranchCond<{1,1,0,1}>, Sched<[WriteBr]> {
bits<4> p;
bits<8> target;
let Inst{11-8} = p;
let Inst{7-0} = target;
let AsmMatchConverter = "cvtThumbBranches";
}
// Tail calls
let isCall = 1, isTerminator = 1, isReturn = 1, isBarrier = 1 in {
// IOS versions.
let Uses = [SP] in {
def tTAILJMPr : tPseudoExpand<(outs), (ins tcGPR:$dst),
4, IIC_Br, [],
(tBX GPR:$dst, (ops 14, zero_reg))>,
Requires<[IsThumb]>, Sched<[WriteBr]>;
}
// tTAILJMPd: MachO version uses a Thumb2 branch (no Thumb1 tail calls
// on MachO), so it's in ARMInstrThumb2.td.
// Non-MachO version:
let Uses = [SP] in {
def tTAILJMPdND : tPseudoExpand<(outs),
(ins t_brtarget:$dst, pred:$p),
4, IIC_Br, [],
(tB t_brtarget:$dst, pred:$p)>,
Requires<[IsThumb, IsNotMachO]>, Sched<[WriteBr]>;
}
}
// A8.6.218 Supervisor Call (Software Interrupt)
// A8.6.16 B: Encoding T1
// If Inst{11-8} == 0b1111 then SEE SVC
let isCall = 1, Uses = [SP] in
def tSVC : T1pI<(outs), (ins imm0_255:$imm), IIC_Br,
"svc", "\t$imm", []>, Encoding16, Sched<[WriteBr]> {
bits<8> imm;
let Inst{15-12} = 0b1101;
let Inst{11-8} = 0b1111;
let Inst{7-0} = imm;
}
// The assembler uses 0xDEFE for a trap instruction.
let isBarrier = 1, isTerminator = 1 in
def tTRAP : TI<(outs), (ins), IIC_Br,
"trap", [(trap)]>, Encoding16, Sched<[WriteBr]> {
let Inst = 0xdefe;
}
//===----------------------------------------------------------------------===//
// Load Store Instructions.
//
// PC-relative loads need to be matched first as constant pool accesses need to
// always be PC-relative. We do this using AddedComplexity, as the pattern is
// simpler than the patterns of the other load instructions.
let canFoldAsLoad = 1, isReMaterializable = 1, AddedComplexity = 10 in
def tLDRpci : T1pIs<(outs tGPR:$Rt), (ins t_addrmode_pc:$addr), IIC_iLoad_i,
"ldr", "\t$Rt, $addr",
[(set tGPR:$Rt, (load (ARMWrapper tconstpool:$addr)))]>,
T1Encoding<{0,1,0,0,1,?}>, Sched<[WriteLd]> {
// A6.2 & A8.6.59
bits<3> Rt;
bits<8> addr;
let Inst{10-8} = Rt;
let Inst{7-0} = addr;
}
// SP-relative loads should be matched before standard immediate-offset loads as
// it means we avoid having to move SP to another register.
let canFoldAsLoad = 1 in
def tLDRspi : T1pIs<(outs tGPR:$Rt), (ins t_addrmode_sp:$addr), IIC_iLoad_i,
"ldr", "\t$Rt, $addr",
[(set tGPR:$Rt, (load t_addrmode_sp:$addr))]>,
T1LdStSP<{1,?,?}>, Sched<[WriteLd]> {
bits<3> Rt;
bits<8> addr;
let Inst{10-8} = Rt;
let Inst{7-0} = addr;
}
// Loads: reg/reg and reg/imm5
let canFoldAsLoad = 1, isReMaterializable = 1 in
multiclass thumb_ld_rr_ri_enc<bits<3> reg_opc, bits<4> imm_opc,
Operand AddrMode_r, Operand AddrMode_i,
AddrMode am, InstrItinClass itin_r,
InstrItinClass itin_i, string asm,
PatFrag opnode> {
// Immediate-offset loads should be matched before register-offset loads as
// when the offset is a constant it's simpler to first check if it fits in the
// immediate offset field then fall back to register-offset if it doesn't.
def i : // reg/imm5
T1pILdStEncodeImm<imm_opc, 1 /* Load */,
(outs tGPR:$Rt), (ins AddrMode_i:$addr),
am, itin_i, asm, "\t$Rt, $addr",
[(set tGPR:$Rt, (opnode AddrMode_i:$addr))]>;
// Register-offset loads are matched last.
def r : // reg/reg
T1pILdStEncode<reg_opc,
(outs tGPR:$Rt), (ins AddrMode_r:$addr),
am, itin_r, asm, "\t$Rt, $addr",
[(set tGPR:$Rt, (opnode AddrMode_r:$addr))]>;
}
// Stores: reg/reg and reg/imm5
multiclass thumb_st_rr_ri_enc<bits<3> reg_opc, bits<4> imm_opc,
Operand AddrMode_r, Operand AddrMode_i,
AddrMode am, InstrItinClass itin_r,
InstrItinClass itin_i, string asm,
PatFrag opnode> {
def i : // reg/imm5
T1pILdStEncodeImm<imm_opc, 0 /* Store */,
(outs), (ins tGPR:$Rt, AddrMode_i:$addr),
am, itin_i, asm, "\t$Rt, $addr",
[(opnode tGPR:$Rt, AddrMode_i:$addr)]>;
def r : // reg/reg
T1pILdStEncode<reg_opc,
(outs), (ins tGPR:$Rt, AddrMode_r:$addr),
am, itin_r, asm, "\t$Rt, $addr",
[(opnode tGPR:$Rt, AddrMode_r:$addr)]>;
}
// A8.6.57 & A8.6.60
defm tLDR : thumb_ld_rr_ri_enc<0b100, 0b0110, t_addrmode_rr,
t_addrmode_is4, AddrModeT1_4,
IIC_iLoad_r, IIC_iLoad_i, "ldr",
load>, Sched<[WriteLd]>;
// A8.6.64 & A8.6.61
defm tLDRB : thumb_ld_rr_ri_enc<0b110, 0b0111, t_addrmode_rr,
t_addrmode_is1, AddrModeT1_1,
IIC_iLoad_bh_r, IIC_iLoad_bh_i, "ldrb",
zextloadi8>, Sched<[WriteLd]>;
// A8.6.76 & A8.6.73
defm tLDRH : thumb_ld_rr_ri_enc<0b101, 0b1000, t_addrmode_rr,
t_addrmode_is2, AddrModeT1_2,
IIC_iLoad_bh_r, IIC_iLoad_bh_i, "ldrh",
zextloadi16>, Sched<[WriteLd]>;
let AddedComplexity = 10 in
def tLDRSB : // A8.6.80
T1pILdStEncode<0b011, (outs tGPR:$Rt), (ins t_addrmode_rr_sext:$addr),
AddrModeT1_1, IIC_iLoad_bh_r,
"ldrsb", "\t$Rt, $addr",
[(set tGPR:$Rt, (sextloadi8 t_addrmode_rr_sext:$addr))]>, Sched<[WriteLd]>;
let AddedComplexity = 10 in
def tLDRSH : // A8.6.84
T1pILdStEncode<0b111, (outs tGPR:$Rt), (ins t_addrmode_rr_sext:$addr),
AddrModeT1_2, IIC_iLoad_bh_r,
"ldrsh", "\t$Rt, $addr",
[(set tGPR:$Rt, (sextloadi16 t_addrmode_rr_sext:$addr))]>, Sched<[WriteLd]>;
def tSTRspi : T1pIs<(outs), (ins tGPR:$Rt, t_addrmode_sp:$addr), IIC_iStore_i,
"str", "\t$Rt, $addr",
[(store tGPR:$Rt, t_addrmode_sp:$addr)]>,
T1LdStSP<{0,?,?}>, Sched<[WriteST]> {
bits<3> Rt;
bits<8> addr;
let Inst{10-8} = Rt;
let Inst{7-0} = addr;
}
// A8.6.194 & A8.6.192
defm tSTR : thumb_st_rr_ri_enc<0b000, 0b0110, t_addrmode_rr,
t_addrmode_is4, AddrModeT1_4,
IIC_iStore_r, IIC_iStore_i, "str",
store>, Sched<[WriteST]>;
// A8.6.197 & A8.6.195
defm tSTRB : thumb_st_rr_ri_enc<0b010, 0b0111, t_addrmode_rr,
t_addrmode_is1, AddrModeT1_1,
IIC_iStore_bh_r, IIC_iStore_bh_i, "strb",
truncstorei8>, Sched<[WriteST]>;
// A8.6.207 & A8.6.205
defm tSTRH : thumb_st_rr_ri_enc<0b001, 0b1000, t_addrmode_rr,
t_addrmode_is2, AddrModeT1_2,
IIC_iStore_bh_r, IIC_iStore_bh_i, "strh",
truncstorei16>, Sched<[WriteST]>;
//===----------------------------------------------------------------------===//
// Load / store multiple Instructions.
//
// These require base address to be written back or one of the loaded regs.
let hasSideEffects = 0 in {
let mayLoad = 1, hasExtraDefRegAllocReq = 1, variadicOpsAreDefs = 1 in
def tLDMIA : T1I<(outs), (ins tGPR:$Rn, pred:$p, reglist:$regs, variable_ops),
IIC_iLoad_m, "ldm${p}\t$Rn, $regs", []>, T1Encoding<{1,1,0,0,1,?}> {
bits<3> Rn;
bits<8> regs;
let Inst{10-8} = Rn;
let Inst{7-0} = regs;
}
// Writeback version is just a pseudo, as there's no encoding difference.
// Writeback happens iff the base register is not in the destination register
// list.
let mayLoad = 1, hasExtraDefRegAllocReq = 1 in
def tLDMIA_UPD :
InstTemplate<AddrModeNone, 0, IndexModeNone, Pseudo, GenericDomain,
"$Rn = $wb", IIC_iLoad_mu>,
PseudoInstExpansion<(tLDMIA tGPR:$Rn, pred:$p, reglist:$regs)> {
let Size = 2;
let OutOperandList = (outs tGPR:$wb);
let InOperandList = (ins tGPR:$Rn, pred:$p, reglist:$regs, variable_ops);
let Pattern = [];
let isCodeGenOnly = 1;
let isPseudo = 1;
list<Predicate> Predicates = [IsThumb];
}
// There is no non-writeback version of STM for Thumb.
let mayStore = 1, hasExtraSrcRegAllocReq = 1 in
def tSTMIA_UPD : Thumb1I<(outs tGPR:$wb),
(ins tGPR:$Rn, pred:$p, reglist:$regs, variable_ops),
AddrModeNone, 2, IIC_iStore_mu,
"stm${p}\t$Rn!, $regs", "$Rn = $wb", []>,
T1Encoding<{1,1,0,0,0,?}> {
bits<3> Rn;
bits<8> regs;
let Inst{10-8} = Rn;
let Inst{7-0} = regs;
}
} // hasSideEffects
def : InstAlias<"ldm${p} $Rn!, $regs",
(tLDMIA tGPR:$Rn, pred:$p, reglist:$regs), 0>,
Requires<[IsThumb, IsThumb1Only]>;
let mayLoad = 1, Uses = [SP], Defs = [SP], hasExtraDefRegAllocReq = 1,
variadicOpsAreDefs = 1 in
def tPOP : T1I<(outs), (ins pred:$p, reglist:$regs, variable_ops),
IIC_iPop,
"pop${p}\t$regs", []>,
T1Misc<{1,1,0,?,?,?,?}>, Sched<[WriteLd]> {
bits<16> regs;
let Inst{8} = regs{15};
let Inst{7-0} = regs{7-0};
}
let mayStore = 1, Uses = [SP], Defs = [SP], hasExtraSrcRegAllocReq = 1 in
def tPUSH : T1I<(outs), (ins pred:$p, reglist:$regs, variable_ops),
IIC_iStore_m,
"push${p}\t$regs", []>,
T1Misc<{0,1,0,?,?,?,?}>, Sched<[WriteST]> {
bits<16> regs;
let Inst{8} = regs{14};
let Inst{7-0} = regs{7-0};
}
//===----------------------------------------------------------------------===//
// Arithmetic Instructions.
//
// Helper classes for encoding T1pI patterns:
class T1pIDPEncode<bits<4> opA, dag oops, dag iops, InstrItinClass itin,
string opc, string asm, list<dag> pattern>
: T1pI<oops, iops, itin, opc, asm, pattern>,
T1DataProcessing<opA> {
bits<3> Rm;
bits<3> Rn;
let Inst{5-3} = Rm;
let Inst{2-0} = Rn;
}
class T1pIMiscEncode<bits<7> opA, dag oops, dag iops, InstrItinClass itin,
string opc, string asm, list<dag> pattern>
: T1pI<oops, iops, itin, opc, asm, pattern>,
T1Misc<opA> {
bits<3> Rm;
bits<3> Rd;
let Inst{5-3} = Rm;
let Inst{2-0} = Rd;
}
// Helper classes for encoding T1sI patterns:
class T1sIDPEncode<bits<4> opA, dag oops, dag iops, InstrItinClass itin,
string opc, string asm, list<dag> pattern>
: T1sI<oops, iops, itin, opc, asm, pattern>,
T1DataProcessing<opA> {
bits<3> Rd;
bits<3> Rn;
let Inst{5-3} = Rn;
let Inst{2-0} = Rd;
}
class T1sIGenEncode<bits<5> opA, dag oops, dag iops, InstrItinClass itin,
string opc, string asm, list<dag> pattern>
: T1sI<oops, iops, itin, opc, asm, pattern>,
T1General<opA> {
bits<3> Rm;
bits<3> Rn;
bits<3> Rd;
let Inst{8-6} = Rm;
let Inst{5-3} = Rn;
let Inst{2-0} = Rd;
}
class T1sIGenEncodeImm<bits<5> opA, dag oops, dag iops, InstrItinClass itin,
string opc, string asm, list<dag> pattern>
: T1sI<oops, iops, itin, opc, asm, pattern>,
T1General<opA> {
bits<3> Rd;
bits<3> Rm;
let Inst{5-3} = Rm;
let Inst{2-0} = Rd;
}
// Helper classes for encoding T1sIt patterns:
class T1sItDPEncode<bits<4> opA, dag oops, dag iops, InstrItinClass itin,
string opc, string asm, list<dag> pattern>
: T1sIt<oops, iops, itin, opc, asm, pattern>,
T1DataProcessing<opA> {
bits<3> Rdn;
bits<3> Rm;
let Inst{5-3} = Rm;
let Inst{2-0} = Rdn;
}
class T1sItGenEncodeImm<bits<5> opA, dag oops, dag iops, InstrItinClass itin,
string opc, string asm, list<dag> pattern>
: T1sIt<oops, iops, itin, opc, asm, pattern>,
T1General<opA> {
bits<3> Rdn;
bits<8> imm8;
let Inst{10-8} = Rdn;
let Inst{7-0} = imm8;
}
let isAdd = 1 in {
// Add with carry register
let isCommutable = 1, Uses = [CPSR] in
def tADC : // A8.6.2
T1sItDPEncode<0b0101, (outs tGPR:$Rdn), (ins tGPR:$Rn, tGPR:$Rm), IIC_iALUr,
"adc", "\t$Rdn, $Rm",
[]>, Sched<[WriteALU]>;
// Add immediate
def tADDi3 : // A8.6.4 T1
T1sIGenEncodeImm<0b01110, (outs tGPR:$Rd), (ins tGPR:$Rm, imm0_7:$imm3),
IIC_iALUi,
"add", "\t$Rd, $Rm, $imm3",
[(set tGPR:$Rd, (add tGPR:$Rm, imm0_7:$imm3))]>,
Sched<[WriteALU]> {
bits<3> imm3;
let Inst{8-6} = imm3;
}
def tADDi8 : // A8.6.4 T2
T1sItGenEncodeImm<{1,1,0,?,?}, (outs tGPR:$Rdn),
(ins tGPR:$Rn, imm0_255:$imm8), IIC_iALUi,
"add", "\t$Rdn, $imm8",
[(set tGPR:$Rdn, (add tGPR:$Rn, imm8_255:$imm8))]>,
Sched<[WriteALU]>;
// Add register
let isCommutable = 1 in
def tADDrr : // A8.6.6 T1
T1sIGenEncode<0b01100, (outs tGPR:$Rd), (ins tGPR:$Rn, tGPR:$Rm),
IIC_iALUr,
"add", "\t$Rd, $Rn, $Rm",
[(set tGPR:$Rd, (add tGPR:$Rn, tGPR:$Rm))]>, Sched<[WriteALU]>;
/// Similar to the above except these set the 's' bit so the