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) {
200 /// TypeString - for a modifier and type, generate the name of the typedef for
201 /// that type. QUc -> uint8x8_t.
202 static std::string TypeString(const char mod, StringRef typestr) {
215 // base type to get the type string for.
216 char type = ClassifyType(typestr, quad, poly, usgn);
218 // Based on the modifying character, change the type and width if necessary.
219 type = ModType(mod, type, quad, poly, usgn, scal, cnst, pntr);
228 s += poly ? "poly8" : "int8";
231 s += quad ? "x16" : "x8";
234 s += poly ? "poly16" : "int16";
237 s += quad ? "x8" : "x4";
243 s += quad ? "x4" : "x2";
249 s += quad ? "x2" : "x1";
255 s += quad ? "x8" : "x4";
261 s += quad ? "x4" : "x2";
264 throw "unhandled type!";
275 // Append _t, finishing the type string typedef type.
287 /// BuiltinTypeString - for a modifier and type, generate the clang
288 /// BuiltinsARM.def prototype code for the function. See the top of clang's
289 /// Builtins.def for a description of the type strings.
290 static std::string BuiltinTypeString(const char mod, StringRef typestr,
291 ClassKind ck, bool ret) {
304 // base type to get the type string for.
305 char type = ClassifyType(typestr, quad, poly, usgn);
307 // Based on the modifying character, change the type and width if necessary.
308 type = ModType(mod, type, quad, poly, usgn, scal, cnst, pntr);
310 // All pointers are void* pointers. Change type to 'v' now.
316 // Treat half-float ('h') types as unsigned short ('s') types.
321 usgn = usgn | poly | ((ck == ClassI || ck == ClassW) && scal && type != 'f');
328 else if (type == 'c')
329 s.push_back('S'); // make chars explicitly signed
331 if (type == 'l') // 64-bit long
343 // Since the return value must be one type, return a vector type of the
344 // appropriate width which we will bitcast. An exception is made for
345 // returning structs of 2, 3, or 4 vectors which are returned in a sret-like
346 // fashion, storing them to a pointer arg.
348 if (mod >= '2' && mod <= '4')
349 return "vv*"; // void result with void* first argument
350 if (mod == 'f' || (ck != ClassB && type == 'f'))
351 return quad ? "V4f" : "V2f";
352 if (ck != ClassB && type == 's')
353 return quad ? "V8s" : "V4s";
354 if (ck != ClassB && type == 'i')
355 return quad ? "V4i" : "V2i";
356 if (ck != ClassB && type == 'l')
357 return quad ? "V2LLi" : "V1LLi";
359 return quad ? "V16Sc" : "V8Sc";
362 // Non-return array types are passed as individual vectors.
364 return quad ? "V16ScV16Sc" : "V8ScV8Sc";
366 return quad ? "V16ScV16ScV16Sc" : "V8ScV8ScV8Sc";
368 return quad ? "V16ScV16ScV16ScV16Sc" : "V8ScV8ScV8ScV8Sc";
370 if (mod == 'f' || (ck != ClassB && type == 'f'))
371 return quad ? "V4f" : "V2f";
372 if (ck != ClassB && type == 's')
373 return quad ? "V8s" : "V4s";
374 if (ck != ClassB && type == 'i')
375 return quad ? "V4i" : "V2i";
376 if (ck != ClassB && type == 'l')
377 return quad ? "V2LLi" : "V1LLi";
379 return quad ? "V16Sc" : "V8Sc";
382 /// MangleName - Append a type or width suffix to a base neon function name,
383 /// and insert a 'q' in the appropriate location if the operation works on
384 /// 128b rather than 64b. E.g. turn "vst2_lane" into "vst2q_lane_f32", etc.
385 static std::string MangleName(const std::string &name, StringRef typestr,
387 if (name == "vcvt_f32_f16")
393 char type = ClassifyType(typestr, quad, poly, usgn);
395 std::string s = name;
400 case ClassS: s += poly ? "_p8" : usgn ? "_u8" : "_s8"; break;
401 case ClassI: s += "_i8"; break;
402 case ClassW: s += "_8"; break;
408 case ClassS: s += poly ? "_p16" : usgn ? "_u16" : "_s16"; break;
409 case ClassI: s += "_i16"; break;
410 case ClassW: s += "_16"; break;
416 case ClassS: s += usgn ? "_u32" : "_s32"; break;
417 case ClassI: s += "_i32"; break;
418 case ClassW: s += "_32"; break;
424 case ClassS: s += usgn ? "_u64" : "_s64"; break;
425 case ClassI: s += "_i64"; break;
426 case ClassW: s += "_64"; break;
433 case ClassI: s += "_f16"; break;
434 case ClassW: s += "_16"; break;
441 case ClassI: s += "_f32"; break;
442 case ClassW: s += "_32"; break;
447 throw "unhandled type!";
453 // Insert a 'q' before the first '_' character so that it ends up before
454 // _lane or _n on vector-scalar operations.
456 size_t pos = s.find('_');
457 s = s.insert(pos, "q");
462 // Generate the string "(argtype a, argtype b, ...)"
463 static std::string GenArgs(const std::string &proto, StringRef typestr) {
464 bool define = proto.find('i') != std::string::npos;
470 for (unsigned i = 1, e = proto.size(); i != e; ++i, ++arg) {
472 s += TypeString(proto[i], typestr);
484 static std::string Duplicate(unsigned nElts, StringRef typestr,
485 const std::string &a) {
488 s = "(" + TypeString('d', typestr) + "){ ";
489 for (unsigned i = 0; i != nElts; ++i) {
499 static unsigned GetNumElements(StringRef typestr, bool &quad) {
502 char type = ClassifyType(typestr, quad, dummy, dummy);
505 case 'c': nElts = 8; break;
506 case 's': nElts = 4; break;
507 case 'i': nElts = 2; break;
508 case 'l': nElts = 1; break;
509 case 'h': nElts = 4; break;
510 case 'f': nElts = 2; break;
512 throw "unhandled type!";
515 if (quad) nElts <<= 1;
519 // Generate the definition for this intrinsic, e.g. "a + b" for OpAdd.
520 static std::string GenOpString(OpKind op, const std::string &proto,
523 unsigned nElts = GetNumElements(typestr, quad);
525 std::string ts = TypeString(proto[0], typestr);
527 if (op == OpHi || op == OpLo) {
528 s = "union { " + ts + " r; double d; } u; u.d";
543 s += "a * " + Duplicate(nElts, typestr, "b");
549 s += "a + (b * " + Duplicate(nElts, typestr, "c") + ")";
555 s += "a - (b * " + Duplicate(nElts, typestr, "c") + ")";
561 s += "(" + ts + ")(a == b)";
564 s += "(" + ts + ")(a >= b)";
567 s += "(" + ts + ")(a <= b)";
570 s += "(" + ts + ")(a > b)";
573 s += "(" + ts + ")(a < b)";
597 s += "(" + ts + ")a";
600 s += "(" + ts + ")__builtin_shufflevector((int64x1_t)a";
601 s += ", (int64x1_t)b, 0, 1)";
604 s += "(((float64x2_t)a)[1])";
607 s += "(((float64x2_t)a)[0])";
610 s += Duplicate(nElts, typestr, "a");
613 // ((0 & 1) | (~0 & 2))
615 ts = TypeString(proto[1], typestr);
616 s += "((a & (" + ts + ")b) | ";
617 s += "(~a & (" + ts + ")c))";
620 s += "__builtin_shufflevector(a, a";
621 for (unsigned i = 2; i <= nElts; i += 2)
622 for (unsigned j = 0; j != 2; ++j)
623 s += ", " + utostr(i - j - 1);
627 unsigned WordElts = nElts >> (1 + (int)quad);
628 s += "__builtin_shufflevector(a, a";
629 for (unsigned i = WordElts; i <= nElts; i += WordElts)
630 for (unsigned j = 0; j != WordElts; ++j)
631 s += ", " + utostr(i - j - 1);
636 unsigned DblWordElts = nElts >> (int)quad;
637 s += "__builtin_shufflevector(a, a";
638 for (unsigned i = DblWordElts; i <= nElts; i += DblWordElts)
639 for (unsigned j = 0; j != DblWordElts; ++j)
640 s += ", " + utostr(i - j - 1);
645 throw "unknown OpKind!";
648 if (op == OpHi || op == OpLo)
649 s += "; return u.r;";
655 static unsigned GetNeonEnum(const std::string &proto, StringRef typestr) {
656 unsigned mod = proto[0];
659 if (mod == 'v' || mod == 'f')
669 // Base type to get the type string for.
670 char type = ClassifyType(typestr, quad, poly, usgn);
672 // Based on the modifying character, change the type and width if necessary.
673 type = ModType(mod, type, quad, poly, usgn, scal, cnst, pntr);
677 if (quad && proto[1] != 'g')
700 throw "unhandled type!";
706 // Generate the definition for this intrinsic, e.g. __builtin_neon_cls(a)
707 static std::string GenBuiltin(const std::string &name, const std::string &proto,
708 StringRef typestr, ClassKind ck) {
712 // If this builtin returns a struct 2, 3, or 4 vectors, pass it as an implicit
713 // sret-like argument.
714 bool sret = (proto[0] >= '2' && proto[0] <= '4');
716 // If this builtin takes an immediate argument, we need to #define it rather
717 // than use a standard declaration, so that SemaChecking can range check
718 // the immediate passed by the user.
719 bool define = proto.find('i') != std::string::npos;
721 // Check if the prototype has a scalar operand with the type of the vector
722 // elements. If not, bitcasting the args will take care of arg checking.
723 // The actual signedness etc. will be taken care of with special enums.
724 if (proto.find('s') == std::string::npos)
727 if (proto[0] != 'v') {
728 std::string ts = TypeString(proto[0], typestr);
732 s += "({ " + ts + " r; ";
738 s += ts + " r; r = (" + ts + ")";
742 bool splat = proto.find('a') != std::string::npos;
744 s += "__builtin_neon_";
746 // Call the non-splat builtin: chop off the "_n" suffix from the name.
747 std::string vname(name, 0, name.size()-2);
748 s += MangleName(vname, typestr, ck);
750 s += MangleName(name, typestr, ck);
754 // Pass the address of the return variable as the first argument to sret-like
759 for (unsigned i = 1, e = proto.size(); i != e; ++i, ++arg) {
760 std::string args = std::string(&arg, 1);
762 // Wrap macro arguments in parenthesis.
764 args = "(" + args + ")";
766 bool argQuad = false;
767 bool argPoly = false;
768 bool argUsgn = false;
769 bool argScalar = false;
771 char argType = ClassifyType(typestr, argQuad, argPoly, argUsgn);
772 argType = ModType(proto[i], argType, argQuad, argPoly, argUsgn, argScalar,
775 // Handle multiple-vector values specially, emitting each subvector as an
776 // argument to the __builtin.
777 if (proto[i] >= '2' && proto[i] <= '4') {
778 // Check if an explicit cast is needed.
779 if (argType != 'c' || argPoly || argUsgn)
780 args = (argQuad ? "(int8x16_t)" : "(int8x8_t)") + args;
782 for (unsigned vi = 0, ve = proto[i] - '0'; vi != ve; ++vi) {
783 s += args + ".val[" + utostr(vi) + "]";
793 if (splat && (i + 1) == e)
794 args = Duplicate(GetNumElements(typestr, argQuad), typestr, args);
796 // Check if an explicit cast is needed.
797 if ((splat || !argScalar) &&
798 ((ck == ClassB && argType != 'c') || argPoly || argUsgn)) {
799 std::string argTypeStr = "c";
801 argTypeStr = argType;
803 argTypeStr = "Q" + argTypeStr;
804 args = "(" + TypeString('d', argTypeStr) + ")" + args;
812 // Extra constant integer to hold type class enum for this function, e.g. s8
814 s += ", " + utostr(GetNeonEnum(proto, typestr));
821 if (proto[0] != 'v') {
832 static std::string GenBuiltinDef(const std::string &name,
833 const std::string &proto,
834 StringRef typestr, ClassKind ck) {
835 std::string s("BUILTIN(__builtin_neon_");
837 // If all types are the same size, bitcasting the args will take care
838 // of arg checking. The actual signedness etc. will be taken care of with
840 if (proto.find('s') == std::string::npos)
843 s += MangleName(name, typestr, ck);
846 for (unsigned i = 0, e = proto.size(); i != e; ++i)
847 s += BuiltinTypeString(proto[i], typestr, ck, i == 0);
849 // Extra constant integer to hold type class enum for this function, e.g. s8
857 /// run - Read the records in arm_neon.td and output arm_neon.h. arm_neon.h
858 /// is comprised of type definitions and function declarations.
859 void NeonEmitter::run(raw_ostream &OS) {
860 EmitSourceFileHeader("ARM NEON Header", OS);
862 // FIXME: emit license into file?
864 OS << "#ifndef __ARM_NEON_H\n";
865 OS << "#define __ARM_NEON_H\n\n";
867 OS << "#ifndef __ARM_NEON__\n";
868 OS << "#error \"NEON support not enabled\"\n";
871 OS << "#include <stdint.h>\n\n";
873 // Emit NEON-specific scalar typedefs.
874 OS << "typedef float float32_t;\n";
875 OS << "typedef int8_t poly8_t;\n";
876 OS << "typedef int16_t poly16_t;\n";
877 OS << "typedef uint16_t float16_t;\n";
879 // Emit Neon vector typedefs.
880 std::string TypedefTypes("cQcsQsiQilQlUcQUcUsQUsUiQUiUlQUlhQhfQfPcQPcPsQPs");
881 SmallVector<StringRef, 24> TDTypeVec;
882 ParseTypes(0, TypedefTypes, TDTypeVec);
884 // Emit vector typedefs.
885 for (unsigned i = 0, e = TDTypeVec.size(); i != e; ++i) {
886 bool dummy, quad = false, poly = false;
887 (void) ClassifyType(TDTypeVec[i], quad, poly, dummy);
889 OS << "typedef __attribute__((neon_polyvector_type(";
891 OS << "typedef __attribute__((neon_vector_type(";
893 unsigned nElts = GetNumElements(TDTypeVec[i], quad);
894 OS << utostr(nElts) << "))) ";
898 OS << TypeString('s', TDTypeVec[i]);
899 OS << " " << TypeString('d', TDTypeVec[i]) << ";\n";
902 OS << "typedef __attribute__((__vector_size__(8))) "
903 "double float64x1_t;\n";
904 OS << "typedef __attribute__((__vector_size__(16))) "
905 "double float64x2_t;\n";
908 // Emit struct typedefs.
909 for (unsigned vi = 2; vi != 5; ++vi) {
910 for (unsigned i = 0, e = TDTypeVec.size(); i != e; ++i) {
911 std::string ts = TypeString('d', TDTypeVec[i]);
912 std::string vs = TypeString('0' + vi, TDTypeVec[i]);
913 OS << "typedef struct " << vs << " {\n";
914 OS << " " << ts << " val";
915 OS << "[" << utostr(vi) << "]";
921 OS << "#define __ai static __attribute__((__always_inline__))\n\n";
923 std::vector<Record*> RV = Records.getAllDerivedDefinitions("Inst");
925 // Unique the return+pattern types, and assign them.
926 for (unsigned i = 0, e = RV.size(); i != e; ++i) {
928 std::string name = LowercaseString(R->getName());
929 std::string Proto = R->getValueAsString("Prototype");
930 std::string Types = R->getValueAsString("Types");
932 SmallVector<StringRef, 16> TypeVec;
933 ParseTypes(R, Types, TypeVec);
935 OpKind k = OpMap[R->getValueAsDef("Operand")->getName()];
937 bool define = Proto.find('i') != std::string::npos;
939 for (unsigned ti = 0, te = TypeVec.size(); ti != te; ++ti) {
940 assert(!Proto.empty() && "");
942 // static always inline + return type
946 OS << "__ai " << TypeString(Proto[0], TypeVec[ti]);
948 // Function name with type suffix
949 OS << " " << MangleName(name, TypeVec[ti], ClassS);
951 // Function arguments
952 OS << GenArgs(Proto, TypeVec[ti]);
961 OS << GenOpString(k, Proto, TypeVec[ti]);
963 if (R->getSuperClasses().size() < 2)
964 throw TGError(R->getLoc(), "Builtin has no class kind");
966 ClassKind ck = ClassMap[R->getSuperClasses()[1]];
969 throw TGError(R->getLoc(), "Builtin has no class kind");
970 OS << GenBuiltin(name, Proto, TypeVec[ti], ck);
978 OS << "#undef __ai\n\n";
979 OS << "#endif /* __ARM_NEON_H */\n";
982 static unsigned RangeFromType(StringRef typestr) {
983 // base type to get the type string for.
984 bool quad = false, dummy = false;
985 char type = ClassifyType(typestr, quad, dummy, dummy);
989 return (8 << (int)quad) - 1;
992 return (4 << (int)quad) - 1;
995 return (2 << (int)quad) - 1;
997 return (1 << (int)quad) - 1;
999 throw "unhandled type!";
1002 assert(0 && "unreachable");
1006 /// runHeader - Emit a file with sections defining:
1007 /// 1. the NEON section of BuiltinsARM.def.
1008 /// 2. the SemaChecking code for the type overload checking.
1009 /// 3. the SemaChecking code for validation of intrinsic immedate arguments.
1010 void NeonEmitter::runHeader(raw_ostream &OS) {
1011 std::vector<Record*> RV = Records.getAllDerivedDefinitions("Inst");
1013 StringMap<OpKind> EmittedMap;
1015 // Generate BuiltinsARM.def for NEON
1016 OS << "#ifdef GET_NEON_BUILTINS\n";
1017 for (unsigned i = 0, e = RV.size(); i != e; ++i) {
1019 OpKind k = OpMap[R->getValueAsDef("Operand")->getName()];
1023 std::string Proto = R->getValueAsString("Prototype");
1025 // Functions with 'a' (the splat code) in the type prototype should not get
1026 // their own builtin as they use the non-splat variant.
1027 if (Proto.find('a') != std::string::npos)
1030 std::string Types = R->getValueAsString("Types");
1031 SmallVector<StringRef, 16> TypeVec;
1032 ParseTypes(R, Types, TypeVec);
1034 if (R->getSuperClasses().size() < 2)
1035 throw TGError(R->getLoc(), "Builtin has no class kind");
1037 std::string name = LowercaseString(R->getName());
1038 ClassKind ck = ClassMap[R->getSuperClasses()[1]];
1040 for (unsigned ti = 0, te = TypeVec.size(); ti != te; ++ti) {
1041 // Generate the BuiltinsARM.def declaration for this builtin, ensuring
1042 // that each unique BUILTIN() macro appears only once in the output
1044 std::string bd = GenBuiltinDef(name, Proto, TypeVec[ti], ck);
1045 if (EmittedMap.count(bd))
1048 EmittedMap[bd] = OpNone;
1054 // Generate the overloaded type checking code for SemaChecking.cpp
1055 OS << "#ifdef GET_NEON_OVERLOAD_CHECK\n";
1056 for (unsigned i = 0, e = RV.size(); i != e; ++i) {
1058 OpKind k = OpMap[R->getValueAsDef("Operand")->getName()];
1062 std::string Proto = R->getValueAsString("Prototype");
1063 std::string Types = R->getValueAsString("Types");
1064 std::string name = LowercaseString(R->getName());
1066 // Functions with 'a' (the splat code) in the type prototype should not get
1067 // their own builtin as they use the non-splat variant.
1068 if (Proto.find('a') != std::string::npos)
1071 // Functions which have a scalar argument cannot be overloaded, no need to
1072 // check them if we are emitting the type checking code.
1073 if (Proto.find('s') != std::string::npos)
1076 SmallVector<StringRef, 16> TypeVec;
1077 ParseTypes(R, Types, TypeVec);
1079 if (R->getSuperClasses().size() < 2)
1080 throw TGError(R->getLoc(), "Builtin has no class kind");
1082 int si = -1, qi = -1;
1083 unsigned mask = 0, qmask = 0;
1084 for (unsigned ti = 0, te = TypeVec.size(); ti != te; ++ti) {
1085 // Generate the switch case(s) for this builtin for the type validation.
1086 bool quad = false, poly = false, usgn = false;
1087 (void) ClassifyType(TypeVec[ti], quad, poly, usgn);
1091 qmask |= 1 << GetNeonEnum(Proto, TypeVec[ti]);
1094 mask |= 1 << GetNeonEnum(Proto, TypeVec[ti]);
1098 OS << "case ARM::BI__builtin_neon_"
1099 << MangleName(name, TypeVec[si], ClassB)
1100 << ": mask = " << "0x" << utohexstr(mask) << "; break;\n";
1102 OS << "case ARM::BI__builtin_neon_"
1103 << MangleName(name, TypeVec[qi], ClassB)
1104 << ": mask = " << "0x" << utohexstr(qmask) << "; break;\n";
1108 // Generate the intrinsic range checking code for shift/lane immediates.
1109 OS << "#ifdef GET_NEON_IMMEDIATE_CHECK\n";
1110 for (unsigned i = 0, e = RV.size(); i != e; ++i) {
1113 OpKind k = OpMap[R->getValueAsDef("Operand")->getName()];
1117 std::string name = LowercaseString(R->getName());
1118 std::string Proto = R->getValueAsString("Prototype");
1119 std::string Types = R->getValueAsString("Types");
1121 // Functions with 'a' (the splat code) in the type prototype should not get
1122 // their own builtin as they use the non-splat variant.
1123 if (Proto.find('a') != std::string::npos)
1126 // Functions which do not have an immediate do not need to have range
1127 // checking code emitted.
1128 if (Proto.find('i') == std::string::npos)
1131 SmallVector<StringRef, 16> TypeVec;
1132 ParseTypes(R, Types, TypeVec);
1134 if (R->getSuperClasses().size() < 2)
1135 throw TGError(R->getLoc(), "Builtin has no class kind");
1137 ClassKind ck = ClassMap[R->getSuperClasses()[1]];
1139 for (unsigned ti = 0, te = TypeVec.size(); ti != te; ++ti) {
1140 std::string namestr, shiftstr, rangestr;
1142 // Builtins which are overloaded by type will need to have their upper
1143 // bound computed at Sema time based on the type constant.
1144 if (Proto.find('s') == std::string::npos) {
1146 if (R->getValueAsBit("isShift")) {
1147 shiftstr = ", true";
1149 // Right shifts have an 'r' in the name, left shifts do not.
1150 if (name.find('r') != std::string::npos)
1151 rangestr = "l = 1; ";
1153 rangestr += "u = RFT(TV" + shiftstr + ")";
1155 rangestr = "u = " + utostr(RangeFromType(TypeVec[ti]));
1157 // Make sure cases appear only once by uniquing them in a string map.
1158 namestr = MangleName(name, TypeVec[ti], ck);
1159 if (EmittedMap.count(namestr))
1161 EmittedMap[namestr] = OpNone;
1163 // Calculate the index of the immediate that should be range checked.
1164 unsigned immidx = 0;
1166 // Builtins that return a struct of multiple vectors have an extra
1167 // leading arg for the struct return.
1168 if (Proto[0] >= '2' && Proto[0] <= '4')
1171 // Add one to the index for each argument until we reach the immediate
1172 // to be checked. Structs of vectors are passed as multiple arguments.
1173 for (unsigned ii = 1, ie = Proto.size(); ii != ie; ++ii) {
1174 switch (Proto[ii]) {
1175 default: immidx += 1; break;
1176 case '2': immidx += 2; break;
1177 case '3': immidx += 3; break;
1178 case '4': immidx += 4; break;
1179 case 'i': ie = ii + 1; break;
1182 OS << "case ARM::BI__builtin_neon_" << MangleName(name, TypeVec[ti], ck)
1183 << ": i = " << immidx << "; " << rangestr << "; break;\n";