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llvm-6502/utils/TableGen/NeonEmitter.cpp
Nate Begeman 3861e74490 Add some additional capabilities to the neon emitter 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@105416 91177308-0d34-0410-b5e6-96231b3b80d8
2010-06-03 21:35:22 +00:00

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//===- NeonEmitter.cpp - Generate arm_neon.h for use with clang -*- C++ -*-===//
//
// The LLVM Compiler Infrastructure
//
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
//
// This tablegen backend is responsible for emitting arm_neon.h, which includes
// a declaration and definition of each function specified by the ARM NEON
// compiler interface. See ARM document DUI0348B.
//
//===----------------------------------------------------------------------===//
#include "NeonEmitter.h"
#include "Record.h"
#include "llvm/ADT/SmallString.h"
#include "llvm/ADT/SmallVector.h"
#include "llvm/ADT/StringExtras.h"
#include "llvm/ADT/StringMap.h"
#include <string>
using namespace llvm;
enum OpKind {
OpNone,
OpAdd,
OpSub,
OpMul,
OpMla,
OpMls,
OpEq,
OpGe,
OpLe,
OpGt,
OpLt,
OpNeg,
OpNot,
OpAnd,
OpOr,
OpXor,
OpAndNot,
OpOrNot,
OpCast
};
static void ParseTypes(Record *r, std::string &s,
SmallVectorImpl<StringRef> &TV) {
const char *data = s.data();
int len = 0;
for (unsigned i = 0, e = s.size(); i != e; ++i, ++len) {
if (data[len] == 'P' || data[len] == 'Q' || data[len] == 'U')
continue;
switch (data[len]) {
case 'c':
case 's':
case 'i':
case 'l':
case 'h':
case 'f':
break;
default:
throw TGError(r->getLoc(),
"Unexpected letter: " + std::string(data + len, 1));
break;
}
TV.push_back(StringRef(data, len + 1));
data += len + 1;
len = -1;
}
}
static char Widen(const char t) {
switch (t) {
case 'c':
return 's';
case 's':
return 'i';
case 'i':
return 'l';
default: throw "unhandled type in widen!";
}
return '\0';
}
static char Narrow(const char t) {
switch (t) {
case 's':
return 'c';
case 'i':
return 's';
case 'l':
return 'i';
default: throw "unhandled type in widen!";
}
return '\0';
}
static char ClassifyType(StringRef ty, bool &quad, bool &poly, bool &usgn) {
unsigned off = 0;
// remember quad.
if (ty[off] == 'Q') {
quad = true;
++off;
}
// remember poly.
if (ty[off] == 'P') {
poly = true;
++off;
}
// remember unsigned.
if (ty[off] == 'U') {
usgn = true;
++off;
}
// base type to get the type string for.
return ty[off];
}
static std::string TypeString(const char mod, StringRef typestr) {
bool quad = false;
bool poly = false;
bool usgn = false;
bool scal = false;
bool cnst = false;
bool pntr = false;
// base type to get the type string for.
char type = ClassifyType(typestr, quad, poly, usgn);
// Based on the modifying character, change the type and width if necessary.
switch (mod) {
case 'v':
return "void";
case 'i':
return "int";
case 't':
if (poly) {
poly = false;
usgn = true;
}
break;
case 'x':
usgn = true;
poly = false;
if (type == 'f')
type = 'i';
break;
case 'f':
type = 'f';
usgn = false;
break;
case 'w':
type = Widen(type);
quad = true;
break;
case 'n':
type = Widen(type);
break;
case 'l':
type = 'l';
scal = true;
usgn = true;
break;
case 's':
scal = true;
break;
case 'k':
quad = true;
break;
case 'c':
cnst = true;
case 'p':
pntr = true;
scal = true;
break;
case 'h':
type = Narrow(type);
break;
case 'e':
type = Narrow(type);
usgn = true;
break;
default:
break;
}
SmallString<128> s;
if (usgn)
s.push_back('u');
switch (type) {
case 'c':
s += poly ? "poly8" : "int8";
if (scal)
break;
s += quad ? "x16" : "x8";
break;
case 's':
s += poly ? "poly16" : "int16";
if (scal)
break;
s += quad ? "x8" : "x4";
break;
case 'i':
s += "int32";
if (scal)
break;
s += quad ? "x4" : "x2";
break;
case 'l':
s += "int64";
if (scal)
break;
s += quad ? "x2" : "x1";
break;
case 'h':
s += "float16";
if (scal)
break;
s += quad ? "x8" : "x4";
break;
case 'f':
s += "float32";
if (scal)
break;
s += quad ? "x4" : "x2";
break;
default:
throw "unhandled type!";
break;
}
if (mod == '2')
s += "x2";
if (mod == '3')
s += "x3";
if (mod == '4')
s += "x4";
// Append _t, finishing the type string typedef type.
s += "_t";
if (cnst)
s += " const";
if (pntr)
s += " *";
return s.str();
}
// Turn "vst2_lane" into "vst2q_lane_f32", etc.
static std::string MangleName(const std::string &name, StringRef typestr) {
bool quad = false;
bool poly = false;
bool usgn = false;
char type = ClassifyType(typestr, quad, poly, usgn);
std::string s = name;
switch (type) {
case 'c':
s += poly ? "_p8" : usgn ? "_u8" : "_s8";
break;
case 's':
s += poly ? "_p16" : usgn ? "_u16" : "_s16";
break;
case 'i':
s += usgn ? "_u32" : "_s32";
break;
case 'l':
s += usgn ? "_u64" : "_s64";
break;
case 'h':
s += "_f16";
break;
case 'f':
s += "_f32";
break;
default:
throw "unhandled type!";
break;
}
// Insert a 'q' before the first '_' character so that it ends up before
// _lane or _n on vector-scalar operations.
if (quad) {
size_t pos = s.find('_');
s = s.insert(pos, "q");
}
return s;
}
// Generate the string "(argtype a, argtype b, ...)"
static std::string GenArgs(const std::string &proto, StringRef typestr) {
char arg = 'a';
std::string s;
s += "(";
for (unsigned i = 1, e = proto.size(); i != e; ++i, ++arg) {
s += TypeString(proto[i], typestr);
s.push_back(' ');
s.push_back(arg);
if ((i + 1) < e)
s += ", ";
}
s += ")";
return s;
}
// Generate the definition for this intrinsic, e.g. "a + b" for OpAdd.
// If structTypes is true, the NEON types are structs of vector types rather
// than vector types, and the call becomes "a.val + b.val"
static std::string GenOpString(OpKind op, const std::string &proto,
StringRef typestr, bool structTypes = true) {
std::string s("return ");
std::string ts = TypeString(proto[0], typestr);
if (structTypes)
s += "(" + ts + "){";
std::string a, b, c;
if (proto.size() > 1)
a = (structTypes && proto[1] != 'l') ? "a.val" : "a";
b = structTypes ? "b.val" : "b";
c = structTypes ? "c.val" : "c";
switch(op) {
case OpAdd:
s += a + " + " + b;
break;
case OpSub:
s += a + " - " + b;
break;
case OpMul:
s += a + " * " + b;
break;
case OpMla:
s += a + " + ( " + b + " * " + c + " )";
break;
case OpMls:
s += a + " - ( " + b + " * " + c + " )";
break;
case OpEq:
s += "(__neon_" + ts + ")(" + a + " == " + b + ")";
break;
case OpGe:
s += "(__neon_" + ts + ")(" + a + " >= " + b + ")";
break;
case OpLe:
s += "(__neon_" + ts + ")(" + a + " <= " + b + ")";
break;
case OpGt:
s += "(__neon_" + ts + ")(" + a + " > " + b + ")";
break;
case OpLt:
s += "(__neon_" + ts + ")(" + a + " < " + b + ")";
break;
case OpNeg:
s += " -" + a;
break;
case OpNot:
s += " ~" + a;
break;
case OpAnd:
s += a + " & " + b;
break;
case OpOr:
s += a + " | " + b;
break;
case OpXor:
s += a + " ^ " + b;
break;
case OpAndNot:
s += a + " & ~" + b;
break;
case OpOrNot:
s += a + " | ~" + b;
break;
case OpCast:
s += "(__neon_" + ts + ")" + a;
break;
default:
throw "unknown OpKind!";
break;
}
if (structTypes)
s += "}";
s += ";";
return s;
}
// Generate the definition for this intrinsic, e.g. __builtin_neon_cls(a)
// If structTypes is true, the NEON types are structs of vector types rather
// than vector types, and the call becomes __builtin_neon_cls(a.val)
static std::string GenBuiltin(const std::string &name, const std::string &proto,
StringRef typestr, bool structTypes = true) {
char arg = 'a';
std::string s;
if (proto[0] != 'v') {
// FIXME: if return type is 2/3/4, emit unioning code.
s += "return ";
if (structTypes) {
s += "(";
s += TypeString(proto[0], typestr);
s += "){";
}
}
s += "__builtin_neon_";
s += name;
s += "(";
for (unsigned i = 1, e = proto.size(); i != e; ++i, ++arg) {
s.push_back(arg);
if (structTypes && proto[i] != 's' && proto[i] != 'i' && proto[i] != 'l' &&
proto[i] != 'p' && proto[i] != 'c') {
s += ".val";
}
if ((i + 1) < e)
s += ", ";
}
s += ")";
if (proto[0] != 'v' && structTypes)
s += "}";
s += ";";
return s;
}
void NeonEmitter::run(raw_ostream &OS) {
EmitSourceFileHeader("ARM NEON Header", OS);
// FIXME: emit license into file?
OS << "#ifndef __ARM_NEON_H\n";
OS << "#define __ARM_NEON_H\n\n";
OS << "#ifndef __ARM_NEON__\n";
OS << "#error \"NEON support not enabled\"\n";
OS << "#endif\n\n";
OS << "#include <stdint.h>\n\n";
// Emit NEON-specific scalar typedefs.
// FIXME: probably need to do something better for polynomial types.
// FIXME: is this the correct thing to do for float16?
OS << "typedef float float32_t;\n";
OS << "typedef uint8_t poly8_t;\n";
OS << "typedef uint16_t poly16_t;\n";
OS << "typedef uint16_t float16_t;\n";
// Emit Neon vector typedefs.
std::string TypedefTypes("cQcsQsiQilQlUcQUcUsQUsUiQUiUlQUlhQhfQfPcQPcPsQPs");
SmallVector<StringRef, 24> TDTypeVec;
ParseTypes(0, TypedefTypes, TDTypeVec);
// Emit vector typedefs.
for (unsigned i = 0, e = TDTypeVec.size(); i != e; ++i) {
bool dummy, quad = false;
(void) ClassifyType(TDTypeVec[i], quad, dummy, dummy);
OS << "typedef __attribute__(( __vector_size__(";
OS << (quad ? "16) )) " : "8) )) ");
OS << TypeString('s', TDTypeVec[i]);
OS << " __neon_";
OS << TypeString('d', TDTypeVec[i]) << ";\n";
}
OS << "\n";
// Emit struct typedefs.
for (unsigned vi = 1; vi != 5; ++vi) {
for (unsigned i = 0, e = TDTypeVec.size(); i != e; ++i) {
std::string ts = TypeString('d', TDTypeVec[i]);
std::string vs = (vi > 1) ? TypeString('0' + vi, TDTypeVec[i]) : ts;
OS << "typedef struct __" << vs << " {\n";
OS << " __neon_" << ts << " val";
if (vi > 1)
OS << "[" << utostr(vi) << "]";
OS << ";\n} " << vs << ";\n\n";
}
}
OS << "#define __ai static __attribute__((__always_inline__))\n\n";
std::vector<Record*> RV = Records.getAllDerivedDefinitions("Inst");
StringMap<OpKind> OpMap;
OpMap["OP_NONE"] = OpNone;
OpMap["OP_ADD"] = OpAdd;
OpMap["OP_SUB"] = OpSub;
OpMap["OP_MUL"] = OpMul;
OpMap["OP_MLA"] = OpMla;
OpMap["OP_MLS"] = OpMls;
OpMap["OP_EQ"] = OpEq;
OpMap["OP_GE"] = OpGe;
OpMap["OP_LE"] = OpLe;
OpMap["OP_GT"] = OpGt;
OpMap["OP_LT"] = OpLt;
OpMap["OP_NEG"] = OpNeg;
OpMap["OP_NOT"] = OpNot;
OpMap["OP_AND"] = OpAnd;
OpMap["OP_OR"] = OpOr;
OpMap["OP_XOR"] = OpXor;
OpMap["OP_ANDN"] = OpAndNot;
OpMap["OP_ORN"] = OpOrNot;
OpMap["OP_CAST"] = OpCast;
// Unique the return+pattern types, and assign them.
for (unsigned i = 0, e = RV.size(); i != e; ++i) {
Record *R = RV[i];
std::string name = LowercaseString(R->getName());
std::string Proto = R->getValueAsString("Prototype");
std::string Types = R->getValueAsString("Types");
SmallVector<StringRef, 16> TypeVec;
ParseTypes(R, Types, TypeVec);
OpKind k = OpMap[R->getValueAsDef("Operand")->getName()];
for (unsigned ti = 0, te = TypeVec.size(); ti != te; ++ti) {
assert(!Proto.empty() && "");
// static always inline + return type
OS << "__ai " << TypeString(Proto[0], TypeVec[ti]);
// Function name with type suffix
OS << " " << MangleName(name, TypeVec[ti]);
// Function arguments
OS << GenArgs(Proto, TypeVec[ti]);
// Definition.
OS << " { ";
if (k != OpNone)
OS << GenOpString(k, Proto, TypeVec[ti]);
else
OS << GenBuiltin(name, Proto, TypeVec[ti]);
OS << " }\n";
}
OS << "\n";
}
// TODO:
// Unique the return+pattern types, and assign them to each record
// Emit a #define for each unique "type" of intrinsic declaring all variants.
// Emit a #define for each intrinsic mapping it to a particular type.
OS << "#endif /* __ARM_NEON_H */\n";
}
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