1 //===- TargetSelectionDAG.td - Common code for DAG isels ---*- tablegen -*-===//
3 // The LLVM Compiler Infrastructure
5 // This file was developed by the LLVM research group and is distributed under
6 // the University of Illinois Open Source License. See LICENSE.TXT for details.
8 //===----------------------------------------------------------------------===//
10 // This file defines the target-independent interfaces used by SelectionDAG
11 // instruction selection generators.
13 //===----------------------------------------------------------------------===//
15 //===----------------------------------------------------------------------===//
16 // Selection DAG Type Constraint definitions.
18 // Note that the semantics of these constraints are hard coded into tblgen. To
19 // modify or add constraints, you have to hack tblgen.
22 class SDTypeConstraint<int opnum> {
23 int OperandNum = opnum;
26 // SDTCisVT - The specified operand has exactly this VT.
27 class SDTCisVT<int OpNum, ValueType vt> : SDTypeConstraint<OpNum> {
31 class SDTCisPtrTy<int OpNum> : SDTypeConstraint<OpNum>;
33 // SDTCisInt - The specified operand is has integer type.
34 class SDTCisInt<int OpNum> : SDTypeConstraint<OpNum>;
36 // SDTCisFP - The specified operand is has floating point type.
37 class SDTCisFP<int OpNum> : SDTypeConstraint<OpNum>;
39 // SDTCisSameAs - The two specified operands have identical types.
40 class SDTCisSameAs<int OpNum, int OtherOp> : SDTypeConstraint<OpNum> {
41 int OtherOperandNum = OtherOp;
44 // SDTCisVTSmallerThanOp - The specified operand is a VT SDNode, and its type is
45 // smaller than the 'Other' operand.
46 class SDTCisVTSmallerThanOp<int OpNum, int OtherOp> : SDTypeConstraint<OpNum> {
47 int OtherOperandNum = OtherOp;
50 class SDTCisOpSmallerThanOp<int SmallOp, int BigOp> : SDTypeConstraint<SmallOp>{
51 int BigOperandNum = BigOp;
54 //===----------------------------------------------------------------------===//
55 // Selection DAG Type Profile definitions.
57 // These use the constraints defined above to describe the type requirements of
58 // the various nodes. These are not hard coded into tblgen, allowing targets to
59 // add their own if needed.
62 // SDTypeProfile - This profile describes the type requirements of a Selection
64 class SDTypeProfile<int numresults, int numoperands,
65 list<SDTypeConstraint> constraints> {
66 int NumResults = numresults;
67 int NumOperands = numoperands;
68 list<SDTypeConstraint> Constraints = constraints;
72 def SDTIntLeaf: SDTypeProfile<1, 0, [SDTCisInt<0>]>; // for 'imm'.
73 def SDTFPLeaf : SDTypeProfile<1, 0, [SDTCisFP<0>]>; // for 'fpimm'.
74 def SDTPtrLeaf: SDTypeProfile<1, 0, [SDTCisPtrTy<0>]>; // for '&g'.
75 def SDTOther : SDTypeProfile<1, 0, [SDTCisVT<0, OtherVT>]>; // for 'vt'.
76 def SDTUNDEF : SDTypeProfile<1, 0, []>; // for 'undef'.
77 def SDTUnaryOp : SDTypeProfile<1, 1, []>; // bitconvert
79 def SDTIntBinOp : SDTypeProfile<1, 2, [ // add, and, or, xor, udiv, etc.
80 SDTCisSameAs<0, 1>, SDTCisSameAs<0, 2>, SDTCisInt<0>
82 def SDTIntShiftOp : SDTypeProfile<1, 2, [ // shl, sra, srl
83 SDTCisSameAs<0, 1>, SDTCisInt<0>, SDTCisInt<2>
85 def SDTFPBinOp : SDTypeProfile<1, 2, [ // fadd, fmul, etc.
86 SDTCisSameAs<0, 1>, SDTCisSameAs<0, 2>, SDTCisFP<0>
88 def SDTFPSignOp : SDTypeProfile<1, 2, [ // fcopysign.
89 SDTCisSameAs<0, 1>, SDTCisFP<0>, SDTCisFP<2>
91 def SDTFPTernaryOp : SDTypeProfile<1, 3, [ // fmadd, fnmsub, etc.
92 SDTCisSameAs<0, 1>, SDTCisSameAs<0, 2>, SDTCisSameAs<0, 3>, SDTCisFP<0>
94 def SDTIntUnaryOp : SDTypeProfile<1, 1, [ // ctlz
95 SDTCisSameAs<0, 1>, SDTCisInt<0>
97 def SDTIntExtendOp : SDTypeProfile<1, 1, [ // sext, zext, anyext
98 SDTCisInt<0>, SDTCisInt<1>, SDTCisOpSmallerThanOp<1, 0>
100 def SDTIntTruncOp : SDTypeProfile<1, 1, [ // trunc
101 SDTCisInt<0>, SDTCisInt<1>, SDTCisOpSmallerThanOp<0, 1>
103 def SDTFPUnaryOp : SDTypeProfile<1, 1, [ // fneg, fsqrt, etc
104 SDTCisSameAs<0, 1>, SDTCisFP<0>
106 def SDTFPRoundOp : SDTypeProfile<1, 1, [ // fround
107 SDTCisFP<0>, SDTCisFP<1>, SDTCisOpSmallerThanOp<0, 1>
109 def SDTFPExtendOp : SDTypeProfile<1, 1, [ // fextend
110 SDTCisFP<0>, SDTCisFP<1>, SDTCisOpSmallerThanOp<1, 0>
112 def SDTIntToFPOp : SDTypeProfile<1, 1, [ // [su]int_to_fp
113 SDTCisFP<0>, SDTCisInt<1>
115 def SDTFPToIntOp : SDTypeProfile<1, 1, [ // fp_to_[su]int
116 SDTCisInt<0>, SDTCisFP<1>
118 def SDTExtInreg : SDTypeProfile<1, 2, [ // sext_inreg
119 SDTCisSameAs<0, 1>, SDTCisInt<0>, SDTCisVT<2, OtherVT>,
120 SDTCisVTSmallerThanOp<2, 1>
123 def SDTSetCC : SDTypeProfile<1, 3, [ // setcc
124 SDTCisInt<0>, SDTCisSameAs<1, 2>, SDTCisVT<3, OtherVT>
127 def SDTSelect : SDTypeProfile<1, 3, [ // select
128 SDTCisInt<1>, SDTCisSameAs<0, 2>, SDTCisSameAs<2, 3>
131 def SDTSelectCC : SDTypeProfile<1, 5, [ // select_cc
132 SDTCisSameAs<1, 2>, SDTCisSameAs<3, 4>, SDTCisSameAs<0, 3>,
136 def SDTBr : SDTypeProfile<0, 1, [ // br
140 def SDTBrcond : SDTypeProfile<0, 2, [ // brcond
141 SDTCisInt<0>, SDTCisVT<1, OtherVT>
144 def SDTRet : SDTypeProfile<0, 0, []>; // ret
146 def SDTLoad : SDTypeProfile<1, 1, [ // load
150 def SDTStore : SDTypeProfile<0, 2, [ // store
154 def SDTExtLoad : SDTypeProfile<1, 3, [ // extload
155 SDTCisPtrTy<1>, SDTCisVT<2, OtherVT>, SDTCisVT<3, OtherVT>
157 def SDTIntExtLoad : SDTypeProfile<1, 3, [ // sextload, zextload
158 SDTCisInt<0>, SDTCisPtrTy<1>, SDTCisVT<2, OtherVT>, SDTCisVT<3, OtherVT>
160 def SDTTruncStore : SDTypeProfile<0, 4, [ // truncstore
161 SDTCisPtrTy<1>, SDTCisVT<2, OtherVT>, SDTCisVT<3, OtherVT>
164 //===----------------------------------------------------------------------===//
165 // Selection DAG Node Properties.
167 // Note: These are hard coded into tblgen.
169 class SDNodeProperty;
170 def SDNPCommutative : SDNodeProperty; // X op Y == Y op X
171 def SDNPAssociative : SDNodeProperty; // (X op Y) op Z == X op (Y op Z)
172 def SDNPHasChain : SDNodeProperty; // R/W chain operand and result
173 def SDNPOutFlag : SDNodeProperty; // Write a flag result
174 def SDNPInFlag : SDNodeProperty; // Read a flag operand
175 def SDNPOptInFlag : SDNodeProperty; // Optionally read a flag operand
177 //===----------------------------------------------------------------------===//
178 // Selection DAG Node definitions.
180 class SDNode<string opcode, SDTypeProfile typeprof,
181 list<SDNodeProperty> props = [], string sdclass = "SDNode"> {
182 string Opcode = opcode;
183 string SDClass = sdclass;
184 list<SDNodeProperty> Properties = props;
185 SDTypeProfile TypeProfile = typeprof;
192 def imm : SDNode<"ISD::Constant" , SDTIntLeaf , [], "ConstantSDNode">;
193 def fpimm : SDNode<"ISD::TargetConstantFP",
194 SDTFPLeaf, [], "ConstantFPSDNode">;
195 def vt : SDNode<"ISD::VALUETYPE" , SDTOther , [], "VTSDNode">;
196 def bb : SDNode<"ISD::BasicBlock", SDTOther , [], "BasicBlockSDNode">;
197 def cond : SDNode<"ISD::CONDCODE" , SDTOther , [], "CondCodeSDNode">;
198 def undef : SDNode<"ISD::UNDEF" , SDTUNDEF , []>;
199 def globaladdr : SDNode<"ISD::GlobalAddress", SDTPtrLeaf, [],
200 "GlobalAddressSDNode">;
201 def tglobaladdr : SDNode<"ISD::TargetGlobalAddress", SDTPtrLeaf, [],
202 "GlobalAddressSDNode">;
203 def constpool : SDNode<"ISD::ConstantPool", SDTPtrLeaf, [],
204 "ConstantPoolSDNode">;
205 def tconstpool : SDNode<"ISD::TargetConstantPool", SDTPtrLeaf, [],
206 "ConstantPoolSDNode">;
207 def frameindex : SDNode<"ISD::FrameIndex", SDTPtrLeaf, [],
209 def tframeindex : SDNode<"ISD::TargetFrameIndex", SDTPtrLeaf, [],
211 def externalsym : SDNode<"ISD::ExternalSymbol", SDTPtrLeaf, [],
212 "ExternalSymbolSDNode">;
213 def texternalsym: SDNode<"ISD::TargetExternalSymbol", SDTPtrLeaf, [],
214 "ExternalSymbolSDNode">;
216 def add : SDNode<"ISD::ADD" , SDTIntBinOp ,
217 [SDNPCommutative, SDNPAssociative]>;
218 def sub : SDNode<"ISD::SUB" , SDTIntBinOp>;
219 def mul : SDNode<"ISD::MUL" , SDTIntBinOp,
220 [SDNPCommutative, SDNPAssociative]>;
221 def mulhs : SDNode<"ISD::MULHS" , SDTIntBinOp, [SDNPCommutative]>;
222 def mulhu : SDNode<"ISD::MULHU" , SDTIntBinOp, [SDNPCommutative]>;
223 def sdiv : SDNode<"ISD::SDIV" , SDTIntBinOp>;
224 def udiv : SDNode<"ISD::UDIV" , SDTIntBinOp>;
225 def srem : SDNode<"ISD::SREM" , SDTIntBinOp>;
226 def urem : SDNode<"ISD::UREM" , SDTIntBinOp>;
227 def srl : SDNode<"ISD::SRL" , SDTIntShiftOp>;
228 def sra : SDNode<"ISD::SRA" , SDTIntShiftOp>;
229 def shl : SDNode<"ISD::SHL" , SDTIntShiftOp>;
230 def rotl : SDNode<"ISD::ROTL" , SDTIntShiftOp>;
231 def rotr : SDNode<"ISD::ROTR" , SDTIntShiftOp>;
232 def and : SDNode<"ISD::AND" , SDTIntBinOp,
233 [SDNPCommutative, SDNPAssociative]>;
234 def or : SDNode<"ISD::OR" , SDTIntBinOp,
235 [SDNPCommutative, SDNPAssociative]>;
236 def xor : SDNode<"ISD::XOR" , SDTIntBinOp,
237 [SDNPCommutative, SDNPAssociative]>;
238 def addc : SDNode<"ISD::ADDC" , SDTIntBinOp,
239 [SDNPCommutative, SDNPOutFlag]>;
240 def adde : SDNode<"ISD::ADDE" , SDTIntBinOp,
241 [SDNPCommutative, SDNPOutFlag, SDNPInFlag]>;
242 def subc : SDNode<"ISD::SUBC" , SDTIntBinOp,
244 def sube : SDNode<"ISD::SUBE" , SDTIntBinOp,
245 [SDNPOutFlag, SDNPInFlag]>;
247 def sext_inreg : SDNode<"ISD::SIGN_EXTEND_INREG", SDTExtInreg>;
248 def bswap : SDNode<"ISD::BSWAP" , SDTIntUnaryOp>;
249 def ctlz : SDNode<"ISD::CTLZ" , SDTIntUnaryOp>;
250 def cttz : SDNode<"ISD::CTTZ" , SDTIntUnaryOp>;
251 def ctpop : SDNode<"ISD::CTPOP" , SDTIntUnaryOp>;
252 def sext : SDNode<"ISD::SIGN_EXTEND", SDTIntExtendOp>;
253 def zext : SDNode<"ISD::ZERO_EXTEND", SDTIntExtendOp>;
254 def anyext : SDNode<"ISD::ANY_EXTEND" , SDTIntExtendOp>;
255 def trunc : SDNode<"ISD::TRUNCATE" , SDTIntTruncOp>;
256 def bitconvert : SDNode<"ISD::BIT_CONVERT", SDTUnaryOp>;
258 def fadd : SDNode<"ISD::FADD" , SDTFPBinOp, [SDNPCommutative]>;
259 def fsub : SDNode<"ISD::FSUB" , SDTFPBinOp>;
260 def fmul : SDNode<"ISD::FMUL" , SDTFPBinOp, [SDNPCommutative]>;
261 def fdiv : SDNode<"ISD::FDIV" , SDTFPBinOp>;
262 def frem : SDNode<"ISD::FREM" , SDTFPBinOp>;
263 def fabs : SDNode<"ISD::FABS" , SDTFPUnaryOp>;
264 def fneg : SDNode<"ISD::FNEG" , SDTFPUnaryOp>;
265 def fsqrt : SDNode<"ISD::FSQRT" , SDTFPUnaryOp>;
266 def fsin : SDNode<"ISD::FSIN" , SDTFPUnaryOp>;
267 def fcos : SDNode<"ISD::FCOS" , SDTFPUnaryOp>;
269 def fround : SDNode<"ISD::FP_ROUND" , SDTFPRoundOp>;
270 def fextend : SDNode<"ISD::FP_EXTEND" , SDTFPExtendOp>;
271 def fcopysign : SDNode<"ISD::FCOPYSIGN" , SDTFPSignOp>;
273 def sint_to_fp : SDNode<"ISD::SINT_TO_FP" , SDTIntToFPOp>;
274 def uint_to_fp : SDNode<"ISD::UINT_TO_FP" , SDTIntToFPOp>;
275 def fp_to_sint : SDNode<"ISD::FP_TO_SINT" , SDTFPToIntOp>;
276 def fp_to_uint : SDNode<"ISD::FP_TO_UINT" , SDTFPToIntOp>;
278 def setcc : SDNode<"ISD::SETCC" , SDTSetCC>;
279 def select : SDNode<"ISD::SELECT" , SDTSelect>;
280 def selectcc : SDNode<"ISD::SELECT_CC" , SDTSelectCC>;
282 def brcond : SDNode<"ISD::BRCOND" , SDTBrcond, [SDNPHasChain]>;
283 def br : SDNode<"ISD::BR" , SDTBr, [SDNPHasChain]>;
284 def ret : SDNode<"ISD::RET" , SDTRet, [SDNPHasChain]>;
286 def load : SDNode<"ISD::LOAD" , SDTLoad, [SDNPHasChain]>;
287 def store : SDNode<"ISD::STORE" , SDTStore, [SDNPHasChain]>;
289 // Do not use sextld and zextld directly. Use sextload and zextload (see
290 // below) which pass in a dummy srcvalue node which tblgen will skip over.
291 def sextld : SDNode<"ISD::SEXTLOAD" , SDTIntExtLoad, [SDNPHasChain]>;
292 def zextld : SDNode<"ISD::ZEXTLOAD" , SDTIntExtLoad, [SDNPHasChain]>;
293 def extld : SDNode<"ISD::EXTLOAD" , SDTExtLoad, [SDNPHasChain]>;
294 def truncst : SDNode<"ISD::TRUNCSTORE" , SDTTruncStore, [SDNPHasChain]>;
296 //===----------------------------------------------------------------------===//
297 // Selection DAG Condition Codes
299 class CondCode; // ISD::CondCode enums
300 def SETOEQ : CondCode; def SETOGT : CondCode;
301 def SETOGE : CondCode; def SETOLT : CondCode; def SETOLE : CondCode;
302 def SETONE : CondCode; def SETO : CondCode; def SETUO : CondCode;
303 def SETUEQ : CondCode; def SETUGT : CondCode; def SETUGE : CondCode;
304 def SETULT : CondCode; def SETULE : CondCode; def SETUNE : CondCode;
306 def SETEQ : CondCode; def SETGT : CondCode; def SETGE : CondCode;
307 def SETLT : CondCode; def SETLE : CondCode; def SETNE : CondCode;
310 //===----------------------------------------------------------------------===//
311 // Selection DAG Node Transformation Functions.
313 // This mechanism allows targets to manipulate nodes in the output DAG once a
314 // match has been formed. This is typically used to manipulate immediate
317 class SDNodeXForm<SDNode opc, code xformFunction> {
319 code XFormFunction = xformFunction;
322 def NOOP_SDNodeXForm : SDNodeXForm<imm, [{}]>;
325 //===----------------------------------------------------------------------===//
326 // Selection DAG Pattern Fragments.
328 // Pattern fragments are reusable chunks of dags that match specific things.
329 // They can take arguments and have C++ predicates that control whether they
330 // match. They are intended to make the patterns for common instructions more
331 // compact and readable.
334 /// PatFrag - Represents a pattern fragment. This can match something on the
335 /// DAG, frame a single node to multiply nested other fragments.
337 class PatFrag<dag ops, dag frag, code pred = [{}],
338 SDNodeXForm xform = NOOP_SDNodeXForm> {
341 code Predicate = pred;
342 SDNodeXForm OperandTransform = xform;
345 // PatLeaf's are pattern fragments that have no operands. This is just a helper
346 // to define immediates and other common things concisely.
347 class PatLeaf<dag frag, code pred = [{}], SDNodeXForm xform = NOOP_SDNodeXForm>
348 : PatFrag<(ops), frag, pred, xform>;
352 def immAllOnes : PatLeaf<(imm), [{ return N->isAllOnesValue(); }]>;
353 def vtInt : PatLeaf<(vt), [{ return MVT::isInteger(N->getVT()); }]>;
354 def vtFP : PatLeaf<(vt), [{ return MVT::isFloatingPoint(N->getVT()); }]>;
356 // Other helper fragments.
358 def not : PatFrag<(ops node:$in), (xor node:$in, immAllOnes)>;
359 def ineg : PatFrag<(ops node:$in), (sub 0, node:$in)>;
361 // extending load & truncstore fragments.
362 def sextload : PatFrag<(ops node:$ptr, node:$vt),
363 (sextld node:$ptr, srcvalue:$dummy, node:$vt)>;
364 def zextload : PatFrag<(ops node:$ptr, node:$vt),
365 (zextld node:$ptr, srcvalue:$dummy, node:$vt)>;
366 def extload : PatFrag<(ops node:$ptr, node:$vt),
367 (extld node:$ptr, srcvalue:$dummy, node:$vt)>;
368 def truncstore : PatFrag<(ops node:$val, node:$ptr, node:$vt),
369 (truncst node:$val, node:$ptr, srcvalue:$dummy,
372 // setcc convenience fragments.
373 def setoeq : PatFrag<(ops node:$lhs, node:$rhs),
374 (setcc node:$lhs, node:$rhs, SETOEQ)>;
375 def setogt : PatFrag<(ops node:$lhs, node:$rhs),
376 (setcc node:$lhs, node:$rhs, SETOGT)>;
377 def setoge : PatFrag<(ops node:$lhs, node:$rhs),
378 (setcc node:$lhs, node:$rhs, SETOGE)>;
379 def setolt : PatFrag<(ops node:$lhs, node:$rhs),
380 (setcc node:$lhs, node:$rhs, SETOLT)>;
381 def setole : PatFrag<(ops node:$lhs, node:$rhs),
382 (setcc node:$lhs, node:$rhs, SETOLE)>;
383 def setone : PatFrag<(ops node:$lhs, node:$rhs),
384 (setcc node:$lhs, node:$rhs, SETONE)>;
385 def seto : PatFrag<(ops node:$lhs, node:$rhs),
386 (setcc node:$lhs, node:$rhs, SETO)>;
387 def setuo : PatFrag<(ops node:$lhs, node:$rhs),
388 (setcc node:$lhs, node:$rhs, SETUO)>;
389 def setueq : PatFrag<(ops node:$lhs, node:$rhs),
390 (setcc node:$lhs, node:$rhs, SETUEQ)>;
391 def setugt : PatFrag<(ops node:$lhs, node:$rhs),
392 (setcc node:$lhs, node:$rhs, SETUGT)>;
393 def setuge : PatFrag<(ops node:$lhs, node:$rhs),
394 (setcc node:$lhs, node:$rhs, SETUGE)>;
395 def setult : PatFrag<(ops node:$lhs, node:$rhs),
396 (setcc node:$lhs, node:$rhs, SETULT)>;
397 def setule : PatFrag<(ops node:$lhs, node:$rhs),
398 (setcc node:$lhs, node:$rhs, SETULE)>;
399 def setune : PatFrag<(ops node:$lhs, node:$rhs),
400 (setcc node:$lhs, node:$rhs, SETUNE)>;
401 def seteq : PatFrag<(ops node:$lhs, node:$rhs),
402 (setcc node:$lhs, node:$rhs, SETEQ)>;
403 def setgt : PatFrag<(ops node:$lhs, node:$rhs),
404 (setcc node:$lhs, node:$rhs, SETGT)>;
405 def setge : PatFrag<(ops node:$lhs, node:$rhs),
406 (setcc node:$lhs, node:$rhs, SETGE)>;
407 def setlt : PatFrag<(ops node:$lhs, node:$rhs),
408 (setcc node:$lhs, node:$rhs, SETLT)>;
409 def setle : PatFrag<(ops node:$lhs, node:$rhs),
410 (setcc node:$lhs, node:$rhs, SETLE)>;
411 def setne : PatFrag<(ops node:$lhs, node:$rhs),
412 (setcc node:$lhs, node:$rhs, SETNE)>;
414 //===----------------------------------------------------------------------===//
415 // Selection DAG Pattern Support.
417 // Patterns are what are actually matched against the target-flavored
418 // instruction selection DAG. Instructions defined by the target implicitly
419 // define patterns in most cases, but patterns can also be explicitly added when
420 // an operation is defined by a sequence of instructions (e.g. loading a large
421 // immediate value on RISC targets that do not support immediates as large as
425 class Pattern<dag patternToMatch, list<dag> resultInstrs> {
426 dag PatternToMatch = patternToMatch;
427 list<dag> ResultInstrs = resultInstrs;
428 list<Predicate> Predicates = []; // See class Instruction in Target.td.
431 // Pat - A simple (but common) form of a pattern, which produces a simple result
432 // not needing a full list.
433 class Pat<dag pattern, dag result> : Pattern<pattern, [result]>;
435 //===----------------------------------------------------------------------===//
436 // Complex pattern definitions.
438 // Complex patterns, e.g. X86 addressing mode, requires pattern matching code
439 // in C++. NumOperands is the number of operands returned by the select function;
440 // SelectFunc is the name of the function used to pattern match the max. pattern;
441 // RootNodes are the list of possible root nodes of the sub-dags to match.
442 // e.g. X86 addressing mode - def addr : ComplexPattern<4, "SelectAddr", [add]>;
444 class ComplexPattern<ValueType ty, int numops, string fn, list<SDNode> roots = []> {
446 int NumOperands = numops;
447 string SelectFunc = fn;
448 list<SDNode> RootNodes = roots;
451 //===----------------------------------------------------------------------===//
454 def SDT_dwarf_loc : SDTypeProfile<0, 3,
455 [SDTCisInt<0>, SDTCisInt<1>, SDTCisInt<2>]>;
456 def dwarf_loc : SDNode<"ISD::DEBUG_LOC", SDT_dwarf_loc,[SDNPHasChain]>;
458 def SDT_dwarf_label : SDTypeProfile<0, 1, [SDTCisInt<0>]>;
459 def dwarf_label : SDNode<"ISD::DEBUG_LABEL", SDT_dwarf_label,[SDNPHasChain]>;