1 //===- NeonEmitter.cpp - Generate arm_neon.h for use with clang -*- C++ -*-===//
3 // The LLVM Compiler Infrastructure
5 // This file is distributed under the University of Illinois Open Source
6 // License. See LICENSE.TXT for details.
8 //===----------------------------------------------------------------------===//
10 // This tablegen backend is responsible for emitting arm_neon.h, which includes
11 // a declaration and definition of each function specified by the ARM NEON
12 // compiler interface. See ARM document DUI0348B.
14 // Each NEON instruction is implemented in terms of 1 or more functions which
15 // are suffixed with the element type of the input vectors. Functions may be
16 // implemented in terms of generic vector operations such as +, *, -, etc. or
17 // by calling a __builtin_-prefixed function which will be handled by clang's
20 // Additional validation code can be generated by this file when runHeader() is
21 // called, rather than the normal run() entry point.
23 //===----------------------------------------------------------------------===//
25 #include "NeonEmitter.h"
26 #include "llvm/ADT/SmallString.h"
27 #include "llvm/ADT/SmallVector.h"
28 #include "llvm/ADT/StringExtras.h"
33 /// ParseTypes - break down a string such as "fQf" into a vector of StringRefs,
34 /// which each StringRef representing a single type declared in the string.
35 /// for "fQf" we would end up with 2 StringRefs, "f", and "Qf", representing
36 /// 2xfloat and 4xfloat respectively.
37 static void ParseTypes(Record *r, std::string &s,
38 SmallVectorImpl<StringRef> &TV) {
39 const char *data = s.data();
42 for (unsigned i = 0, e = s.size(); i != e; ++i, ++len) {
43 if (data[len] == 'P' || data[len] == 'Q' || data[len] == 'U')
55 throw TGError(r->getLoc(),
56 "Unexpected letter: " + std::string(data + len, 1));
59 TV.push_back(StringRef(data, len + 1));
65 /// Widen - Convert a type code into the next wider type. char -> short,
66 /// short -> int, etc.
67 static char Widen(const char t) {
75 default: throw "unhandled type in widen!";
80 /// Narrow - Convert a type code into the next smaller type. short -> char,
81 /// float -> half float, etc.
82 static char Narrow(const char t) {
92 default: throw "unhandled type in narrow!";
97 /// For a particular StringRef, return the base type code, and whether it has
98 /// the quad-vector, polynomial, or unsigned modifiers set.
99 static char ClassifyType(StringRef ty, bool &quad, bool &poly, bool &usgn) {
103 if (ty[off] == 'Q') {
109 if (ty[off] == 'P') {
114 // remember unsigned.
115 if (ty[off] == 'U') {
120 // base type to get the type string for.
124 /// ModType - Transform a type code and its modifiers based on a mod code. The
125 /// mod code definitions may be found at the top of arm_neon.td.
126 static char ModType(const char mod, char type, bool &quad, bool &poly,
127 bool &usgn, bool &scal, bool &cnst, bool &pntr) {
196 /// TypeString - for a modifier and type, generate the name of the typedef for
197 /// that type. QUc -> uint8x8_t.
198 static std::string TypeString(const char mod, StringRef typestr) {
211 // base type to get the type string for.
212 char type = ClassifyType(typestr, quad, poly, usgn);
214 // Based on the modifying character, change the type and width if necessary.
215 type = ModType(mod, type, quad, poly, usgn, scal, cnst, pntr);
224 s += poly ? "poly8" : "int8";
227 s += quad ? "x16" : "x8";
230 s += poly ? "poly16" : "int16";
233 s += quad ? "x8" : "x4";
239 s += quad ? "x4" : "x2";
245 s += quad ? "x2" : "x1";
251 s += quad ? "x8" : "x4";
257 s += quad ? "x4" : "x2";
260 throw "unhandled type!";
271 // Append _t, finishing the type string typedef type.
283 /// BuiltinTypeString - for a modifier and type, generate the clang
284 /// BuiltinsARM.def prototype code for the function. See the top of clang's
285 /// Builtins.def for a description of the type strings.
286 static std::string BuiltinTypeString(const char mod, StringRef typestr,
287 ClassKind ck, bool ret) {
300 // base type to get the type string for.
301 char type = ClassifyType(typestr, quad, poly, usgn);
303 // Based on the modifying character, change the type and width if necessary.
304 type = ModType(mod, type, quad, poly, usgn, scal, cnst, pntr);
315 usgn = usgn | poly | ((ck == ClassI || ck == ClassW) && scal && type != 'f');
335 // Since the return value must be one type, return a vector type of the
336 // appropriate width which we will bitcast. An exception is made for
337 // returning structs of 2, 3, or 4 vectors which are returned in a sret-like
338 // fashion, storing them to a pointer arg.
340 if (mod == '2' || mod == '3' || mod == '4')
342 if (mod == 'f' || (ck != ClassB && type == 'f'))
343 return quad ? "V4f" : "V2f";
344 if (ck != ClassB && type == 's')
345 return quad ? "V8s" : "V4s";
346 if (ck != ClassB && type == 'i')
347 return quad ? "V4i" : "V2i";
348 if (ck != ClassB && type == 'l')
349 return quad ? "V2LLi" : "V1LLi";
351 return quad ? "V16c" : "V8c";
354 // Non-return array types are passed as individual vectors.
356 return quad ? "V16cV16c" : "V8cV8c";
358 return quad ? "V16cV16cV16c" : "V8cV8cV8c";
360 return quad ? "V16cV16cV16cV16c" : "V8cV8cV8cV8c";
362 if (mod == 'f' || (ck != ClassB && type == 'f'))
363 return quad ? "V4f" : "V2f";
364 if (ck != ClassB && type == 's')
365 return quad ? "V8s" : "V4s";
366 if (ck != ClassB && type == 'i')
367 return quad ? "V4i" : "V2i";
368 if (ck != ClassB && type == 'l')
369 return quad ? "V2LLi" : "V1LLi";
371 return quad ? "V16c" : "V8c";
374 /// MangleName - Append a type or width suffix to a base neon function name,
375 /// and insert a 'q' in the appropriate location if the operation works on
376 /// 128b rather than 64b. E.g. turn "vst2_lane" into "vst2q_lane_f32", etc.
377 static std::string MangleName(const std::string &name, StringRef typestr,
379 if (name == "vcvt_f32_f16")
385 char type = ClassifyType(typestr, quad, poly, usgn);
387 std::string s = name;
392 case ClassS: s += poly ? "_p8" : usgn ? "_u8" : "_s8"; break;
393 case ClassI: s += "_i8"; break;
394 case ClassW: s += "_8"; break;
400 case ClassS: s += poly ? "_p16" : usgn ? "_u16" : "_s16"; break;
401 case ClassI: s += "_i16"; break;
402 case ClassW: s += "_16"; break;
408 case ClassS: s += usgn ? "_u32" : "_s32"; break;
409 case ClassI: s += "_i32"; break;
410 case ClassW: s += "_32"; break;
416 case ClassS: s += usgn ? "_u64" : "_s64"; break;
417 case ClassI: s += "_i64"; break;
418 case ClassW: s += "_64"; break;
425 case ClassI: s += "_f16"; break;
426 case ClassW: s += "_16"; break;
433 case ClassI: s += "_f32"; break;
434 case ClassW: s += "_32"; break;
439 throw "unhandled type!";
445 // Insert a 'q' before the first '_' character so that it ends up before
446 // _lane or _n on vector-scalar operations.
448 size_t pos = s.find('_');
449 s = s.insert(pos, "q");
454 // Generate the string "(argtype a, argtype b, ...)"
455 static std::string GenArgs(const std::string &proto, StringRef typestr) {
456 bool define = proto.find('i') != std::string::npos;
462 for (unsigned i = 1, e = proto.size(); i != e; ++i, ++arg) {
464 s += TypeString(proto[i], typestr);
476 static std::string Duplicate(unsigned nElts, StringRef typestr,
477 const std::string &a) {
480 s = "(" + TypeString('d', typestr) + "){ ";
481 for (unsigned i = 0; i != nElts; ++i) {
491 static unsigned GetNumElements(StringRef typestr, bool &quad) {
494 char type = ClassifyType(typestr, quad, dummy, dummy);
497 case 'c': nElts = 8; break;
498 case 's': nElts = 4; break;
499 case 'i': nElts = 2; break;
500 case 'l': nElts = 1; break;
501 case 'h': nElts = 4; break;
502 case 'f': nElts = 2; break;
504 throw "unhandled type!";
507 if (quad) nElts <<= 1;
511 // Generate the definition for this intrinsic, e.g. "a + b" for OpAdd.
512 static std::string GenOpString(OpKind op, const std::string &proto,
515 unsigned nElts = GetNumElements(typestr, quad);
517 std::string ts = TypeString(proto[0], typestr);
519 if (op == OpHi || op == OpLo) {
520 s = "union { " + ts + " r; double d; } u; u.d";
535 s += "a * " + Duplicate(nElts, typestr, "b");
541 s += "a + (b * " + Duplicate(nElts, typestr, "c") + ")";
547 s += "a - (b * " + Duplicate(nElts, typestr, "c") + ")";
553 s += "(" + ts + ")(a == b)";
556 s += "(" + ts + ")(a >= b)";
559 s += "(" + ts + ")(a <= b)";
562 s += "(" + ts + ")(a > b)";
565 s += "(" + ts + ")(a < b)";
589 s += "(" + ts + ")a";
592 s += "__builtin_shufflevector((int64x1_t)a";
593 s += ", (int64x1_t)b, 0, 1)";
596 s += "(((float64x2_t)a)[1])";
599 s += "(((float64x2_t)a)[0])";
602 s += Duplicate(nElts, typestr, "a");
605 // ((0 & 1) | (~0 & 2))
606 ts = TypeString(proto[1], typestr);
607 s += "(a & (" + ts + ")b) | ";
608 s += "(~a & (" + ts + ")c)";
611 s += "__builtin_shufflevector(a, a";
612 for (unsigned i = 2; i <= nElts; i += 2)
613 for (unsigned j = 0; j != 2; ++j)
614 s += ", " + utostr(i - j - 1);
618 unsigned WordElts = nElts >> (1 + (int)quad);
619 s += "__builtin_shufflevector(a, a";
620 for (unsigned i = WordElts; i <= nElts; i += WordElts)
621 for (unsigned j = 0; j != WordElts; ++j)
622 s += ", " + utostr(i - j - 1);
627 unsigned DblWordElts = nElts >> (int)quad;
628 s += "__builtin_shufflevector(a, a";
629 for (unsigned i = DblWordElts; i <= nElts; i += DblWordElts)
630 for (unsigned j = 0; j != DblWordElts; ++j)
631 s += ", " + utostr(i - j - 1);
636 throw "unknown OpKind!";
639 if (op == OpHi || op == OpLo)
640 s += "; return u.r;";
646 static unsigned GetNeonEnum(const std::string &proto, StringRef typestr) {
647 unsigned mod = proto[0];
650 if (mod == 'v' || mod == 'f')
660 // Base type to get the type string for.
661 char type = ClassifyType(typestr, quad, poly, usgn);
663 // Based on the modifying character, change the type and width if necessary.
664 type = ModType(mod, type, quad, poly, usgn, scal, cnst, pntr);
668 if (quad && proto[1] != 'g')
691 throw "unhandled type!";
697 // Generate the definition for this intrinsic, e.g. __builtin_neon_cls(a)
698 static std::string GenBuiltin(const std::string &name, const std::string &proto,
699 StringRef typestr, ClassKind ck) {
701 unsigned nElts = GetNumElements(typestr, quad);
705 // If this builtin returns a struct 2, 3, or 4 vectors, pass it as an implicit
706 // sret-like argument.
707 bool sret = (proto[0] == '2' || proto[0] == '3' || proto[0] == '4');
709 // If this builtin takes an immediate argument, we need to #define it rather
710 // than use a standard declaration, so that SemaChecking can range check
711 // the immediate passed by the user.
712 bool define = proto.find('i') != std::string::npos;
714 // If all types are the same size, bitcasting the args will take care
715 // of arg checking. The actual signedness etc. will be taken care of with
717 if (proto.find('s') == std::string::npos)
720 if (proto[0] != 'v') {
721 std::string ts = TypeString(proto[0], typestr);
725 s += "({ " + ts + " r; ";
726 else if (proto[0] != 's')
731 s += ts + " r; r = ";
735 bool splat = proto.find('a') != std::string::npos;
737 s += "__builtin_neon_";
739 std::string vname(name, 0, name.size()-2);
740 s += MangleName(vname, typestr, ck);
742 s += MangleName(name, typestr, ck);
746 // Pass the address of the return variable as the first argument to sret-like
751 for (unsigned i = 1, e = proto.size(); i != e; ++i, ++arg) {
752 std::string args = std::string(&arg, 1);
754 args = "(" + args + ")";
756 // Handle multiple-vector values specially, emitting each subvector as an
757 // argument to the __builtin.
758 if (proto[i] == '2' || proto[i] == '3' || proto[i] == '4') {
759 for (unsigned vi = 0, ve = proto[i] - '0'; vi != ve; ++vi) {
760 s += args + ".val[" + utostr(vi) + "]";
770 if (splat && (i + 1) == e)
771 s += Duplicate(nElts, typestr, args);
778 // Extra constant integer to hold type class enum for this function, e.g. s8
780 s += ", " + utostr(GetNeonEnum(proto, typestr));
787 if (proto[0] != 'v') {
798 static std::string GenBuiltinDef(const std::string &name,
799 const std::string &proto,
800 StringRef typestr, ClassKind ck) {
801 std::string s("BUILTIN(__builtin_neon_");
803 // If all types are the same size, bitcasting the args will take care
804 // of arg checking. The actual signedness etc. will be taken care of with
806 if (proto.find('s') == std::string::npos)
809 s += MangleName(name, typestr, ck);
812 for (unsigned i = 0, e = proto.size(); i != e; ++i)
813 s += BuiltinTypeString(proto[i], typestr, ck, i == 0);
815 // Extra constant integer to hold type class enum for this function, e.g. s8
823 /// run - Read the records in arm_neon.td and output arm_neon.h. arm_neon.h
824 /// is comprised of type definitions and function declarations.
825 void NeonEmitter::run(raw_ostream &OS) {
826 EmitSourceFileHeader("ARM NEON Header", OS);
828 // FIXME: emit license into file?
830 OS << "#ifndef __ARM_NEON_H\n";
831 OS << "#define __ARM_NEON_H\n\n";
833 OS << "#ifndef __ARM_NEON__\n";
834 OS << "#error \"NEON support not enabled\"\n";
837 OS << "#include <stdint.h>\n\n";
839 // Emit NEON-specific scalar typedefs.
840 OS << "typedef float float32_t;\n";
841 OS << "typedef int8_t poly8_t;\n";
842 OS << "typedef int16_t poly16_t;\n";
843 OS << "typedef uint16_t float16_t;\n";
845 // Emit Neon vector typedefs.
846 std::string TypedefTypes("cQcsQsiQilQlUcQUcUsQUsUiQUiUlQUlhQhfQfPcQPcPsQPs");
847 SmallVector<StringRef, 24> TDTypeVec;
848 ParseTypes(0, TypedefTypes, TDTypeVec);
850 // Emit vector typedefs.
851 for (unsigned i = 0, e = TDTypeVec.size(); i != e; ++i) {
852 bool dummy, quad = false, poly = false;
853 (void) ClassifyType(TDTypeVec[i], quad, poly, dummy);
855 OS << "typedef __attribute__((neon_polyvector_type(";
857 OS << "typedef __attribute__((neon_vector_type(";
859 unsigned nElts = GetNumElements(TDTypeVec[i], quad);
860 OS << utostr(nElts) << "))) ";
864 OS << TypeString('s', TDTypeVec[i]);
865 OS << " " << TypeString('d', TDTypeVec[i]) << ";\n";
868 OS << "typedef __attribute__((__vector_size__(8))) "
869 "double float64x1_t;\n";
870 OS << "typedef __attribute__((__vector_size__(16))) "
871 "double float64x2_t;\n";
874 // Emit struct typedefs.
875 for (unsigned vi = 2; vi != 5; ++vi) {
876 for (unsigned i = 0, e = TDTypeVec.size(); i != e; ++i) {
877 std::string ts = TypeString('d', TDTypeVec[i]);
878 std::string vs = TypeString('0' + vi, TDTypeVec[i]);
879 OS << "typedef struct " << vs << " {\n";
880 OS << " " << ts << " val";
881 OS << "[" << utostr(vi) << "]";
887 OS << "#define __ai static __attribute__((__always_inline__))\n\n";
889 std::vector<Record*> RV = Records.getAllDerivedDefinitions("Inst");
891 // Unique the return+pattern types, and assign them.
892 for (unsigned i = 0, e = RV.size(); i != e; ++i) {
894 std::string name = LowercaseString(R->getName());
895 std::string Proto = R->getValueAsString("Prototype");
896 std::string Types = R->getValueAsString("Types");
898 SmallVector<StringRef, 16> TypeVec;
899 ParseTypes(R, Types, TypeVec);
901 OpKind k = OpMap[R->getValueAsDef("Operand")->getName()];
903 bool define = Proto.find('i') != std::string::npos;
905 for (unsigned ti = 0, te = TypeVec.size(); ti != te; ++ti) {
906 assert(!Proto.empty() && "");
908 // static always inline + return type
912 OS << "__ai " << TypeString(Proto[0], TypeVec[ti]);
914 // Function name with type suffix
915 OS << " " << MangleName(name, TypeVec[ti], ClassS);
917 // Function arguments
918 OS << GenArgs(Proto, TypeVec[ti]);
927 OS << GenOpString(k, Proto, TypeVec[ti]);
929 if (R->getSuperClasses().size() < 2)
930 throw TGError(R->getLoc(), "Builtin has no class kind");
932 ClassKind ck = ClassMap[R->getSuperClasses()[1]];
935 throw TGError(R->getLoc(), "Builtin has no class kind");
936 OS << GenBuiltin(name, Proto, TypeVec[ti], ck);
944 OS << "#undef __ai\n\n";
945 OS << "#endif /* __ARM_NEON_H */\n";
948 static unsigned RangeFromType(StringRef typestr) {
949 // base type to get the type string for.
950 bool quad = false, dummy = false;
951 char type = ClassifyType(typestr, quad, dummy, dummy);
955 return (8 << (int)quad) - 1;
958 return (4 << (int)quad) - 1;
961 return (2 << (int)quad) - 1;
963 return (1 << (int)quad) - 1;
965 throw "unhandled type!";
968 assert(0 && "unreachable");
972 /// runHeader - Emit a file with sections defining:
973 /// 1. the NEON section of BuiltinsARM.def.
974 /// 2. the SemaChecking code for the type overload checking.
975 /// 3. the SemaChecking code for validation of intrinsic immedate arguments.
976 void NeonEmitter::runHeader(raw_ostream &OS) {
977 std::vector<Record*> RV = Records.getAllDerivedDefinitions("Inst");
979 StringMap<OpKind> EmittedMap;
981 // Generate BuiltinsARM.def for NEON
982 OS << "#ifdef GET_NEON_BUILTINS\n";
983 for (unsigned i = 0, e = RV.size(); i != e; ++i) {
985 OpKind k = OpMap[R->getValueAsDef("Operand")->getName()];
989 std::string Proto = R->getValueAsString("Prototype");
991 // Functions with 'a' (the splat code) in the type prototype should not get
992 // their own builtin as they use the non-splat variant.
993 if (Proto.find('a') != std::string::npos)
996 std::string Types = R->getValueAsString("Types");
997 SmallVector<StringRef, 16> TypeVec;
998 ParseTypes(R, Types, TypeVec);
1000 if (R->getSuperClasses().size() < 2)
1001 throw TGError(R->getLoc(), "Builtin has no class kind");
1003 std::string name = LowercaseString(R->getName());
1004 ClassKind ck = ClassMap[R->getSuperClasses()[1]];
1006 for (unsigned ti = 0, te = TypeVec.size(); ti != te; ++ti) {
1007 // Generate the BuiltinsARM.def declaration for this builtin, ensuring
1008 // that each unique BUILTIN() macro appears only once in the output
1010 std::string bd = GenBuiltinDef(name, Proto, TypeVec[ti], ck);
1011 if (EmittedMap.count(bd))
1014 EmittedMap[bd] = OpNone;
1020 // Generate the overloaded type checking code for SemaChecking.cpp
1021 OS << "#ifdef GET_NEON_OVERLOAD_CHECK\n";
1022 for (unsigned i = 0, e = RV.size(); i != e; ++i) {
1024 OpKind k = OpMap[R->getValueAsDef("Operand")->getName()];
1028 std::string Proto = R->getValueAsString("Prototype");
1029 std::string Types = R->getValueAsString("Types");
1030 std::string name = LowercaseString(R->getName());
1032 // Functions with 'a' (the splat code) in the type prototype should not get
1033 // their own builtin as they use the non-splat variant.
1034 if (Proto.find('a') != std::string::npos)
1037 // Functions which have a scalar argument cannot be overloaded, no need to
1038 // check them if we are emitting the type checking code.
1039 if (Proto.find('s') != std::string::npos)
1042 SmallVector<StringRef, 16> TypeVec;
1043 ParseTypes(R, Types, TypeVec);
1045 if (R->getSuperClasses().size() < 2)
1046 throw TGError(R->getLoc(), "Builtin has no class kind");
1048 int si = -1, qi = -1;
1049 unsigned mask = 0, qmask = 0;
1050 for (unsigned ti = 0, te = TypeVec.size(); ti != te; ++ti) {
1051 // Generate the switch case(s) for this builtin for the type validation.
1052 bool quad = false, poly = false, usgn = false;
1053 (void) ClassifyType(TypeVec[ti], quad, poly, usgn);
1057 qmask |= 1 << GetNeonEnum(Proto, TypeVec[ti]);
1060 mask |= 1 << GetNeonEnum(Proto, TypeVec[ti]);
1064 OS << "case ARM::BI__builtin_neon_"
1065 << MangleName(name, TypeVec[si], ClassB)
1066 << ": mask = " << "0x" << utohexstr(mask) << "; break;\n";
1068 OS << "case ARM::BI__builtin_neon_"
1069 << MangleName(name, TypeVec[qi], ClassB)
1070 << ": mask = " << "0x" << utohexstr(qmask) << "; break;\n";
1074 // Generate the intrinsic range checking code for shift/lane immediates.
1075 OS << "#ifdef GET_NEON_IMMEDIATE_CHECK\n";
1076 for (unsigned i = 0, e = RV.size(); i != e; ++i) {
1079 OpKind k = OpMap[R->getValueAsDef("Operand")->getName()];
1083 std::string name = LowercaseString(R->getName());
1084 std::string Proto = R->getValueAsString("Prototype");
1085 std::string Types = R->getValueAsString("Types");
1087 // Functions with 'a' (the splat code) in the type prototype should not get
1088 // their own builtin as they use the non-splat variant.
1089 if (Proto.find('a') != std::string::npos)
1092 // Functions which do not have an immediate do not need to have range
1093 // checking code emitted.
1094 if (Proto.find('i') == std::string::npos)
1097 SmallVector<StringRef, 16> TypeVec;
1098 ParseTypes(R, Types, TypeVec);
1100 if (R->getSuperClasses().size() < 2)
1101 throw TGError(R->getLoc(), "Builtin has no class kind");
1103 ClassKind ck = ClassMap[R->getSuperClasses()[1]];
1105 for (unsigned ti = 0, te = TypeVec.size(); ti != te; ++ti) {
1106 std::string namestr, shiftstr, rangestr;
1108 // Builtins which are overloaded by type will need to have their upper
1109 // bound computed at Sema time based on the type constant.
1110 if (Proto.find('s') == std::string::npos) {
1112 if (R->getValueAsBit("isShift")) {
1113 shiftstr = ", true";
1115 // Right shifts have an 'r' in the name, left shifts do not.
1116 if (name.find('r') != std::string::npos)
1117 rangestr = "l = 1; ";
1119 rangestr += "u = RFT(TV" + shiftstr + ")";
1121 rangestr = "u = " + utostr(RangeFromType(TypeVec[ti]));
1123 // Make sure cases appear only once by uniquing them in a string map.
1124 namestr = MangleName(name, TypeVec[ti], ck);
1125 if (EmittedMap.count(namestr))
1127 EmittedMap[namestr] = OpNone;
1129 // Calculate the index of the immediate that should be range checked.
1130 unsigned immidx = 0;
1132 // Builtins that return a struct of multiple vectors have an extra
1133 // leading arg for the struct return.
1134 if (Proto[0] == '2' || Proto[0] == '3' || Proto[0] == '4')
1137 // Add one to the index for each argument until we reach the immediate
1138 // to be checked. Structs of vectors are passed as multiple arguments.
1139 for (unsigned ii = 1, ie = Proto.size(); ii != ie; ++ii) {
1140 switch (Proto[ii]) {
1141 default: immidx += 1; break;
1142 case '2': immidx += 2; break;
1143 case '3': immidx += 3; break;
1144 case '4': immidx += 4; break;
1145 case 'i': ie = ii + 1; break;
1148 OS << "case ARM::BI__builtin_neon_" << MangleName(name, TypeVec[ti], ck)
1149 << ": i = " << immidx << "; " << rangestr << "; break;\n";