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Add some comments for TableGen's NeonEmitter.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@120596 91177308-0d34-0410-b5e6-96231b3b80d8
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@ -293,9 +293,9 @@ static std::string BuiltinTypeString(const char mod, StringRef typestr,
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bool pntr = false;
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if (mod == 'v')
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return "v";
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return "v"; // void
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if (mod == 'i')
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return "i";
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return "i"; // int
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// base type to get the type string for.
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char type = ClassifyType(typestr, quad, poly, usgn);
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@ -303,11 +303,13 @@ static std::string BuiltinTypeString(const char mod, StringRef typestr,
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// Based on the modifying character, change the type and width if necessary.
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type = ModType(mod, type, quad, poly, usgn, scal, cnst, pntr);
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// All pointers are void* pointers. Change type to 'v' now.
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if (pntr) {
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usgn = false;
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poly = false;
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type = 'v';
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}
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// Treat half-float ('h') types as unsigned short ('s') types.
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if (type == 'h') {
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type = 's';
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usgn = true;
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@ -320,7 +322,7 @@ static std::string BuiltinTypeString(const char mod, StringRef typestr,
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if (usgn)
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s.push_back('U');
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if (type == 'l')
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if (type == 'l') // 64-bit long
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s += "LLi";
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else
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s.push_back(type);
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@ -338,7 +340,7 @@ static std::string BuiltinTypeString(const char mod, StringRef typestr,
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// fashion, storing them to a pointer arg.
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if (ret) {
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if (mod >= '2' && mod <= '4')
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return "vv*";
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return "vv*"; // void result with void* first argument
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if (mod == 'f' || (ck != ClassB && type == 'f'))
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return quad ? "V4f" : "V2f";
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if (ck != ClassB && type == 's')
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@ -711,9 +713,9 @@ static std::string GenBuiltin(const std::string &name, const std::string &proto,
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// the immediate passed by the user.
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bool define = proto.find('i') != std::string::npos;
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// If all types are the same size, bitcasting the args will take care
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// of arg checking. The actual signedness etc. will be taken care of with
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// special enums.
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// Check if the prototype has a scalar operand with the type of the vector
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// elements. If not, bitcasting the args will take care of arg checking.
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// The actual signedness etc. will be taken care of with special enums.
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if (proto.find('s') == std::string::npos)
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ck = ClassB;
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@ -736,6 +738,7 @@ static std::string GenBuiltin(const std::string &name, const std::string &proto,
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s += "__builtin_neon_";
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if (splat) {
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// Call the non-splat builtin: chop off the "_n" suffix from the name.
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std::string vname(name, 0, name.size()-2);
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s += MangleName(vname, typestr, ck);
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} else {
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@ -750,6 +753,8 @@ static std::string GenBuiltin(const std::string &name, const std::string &proto,
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for (unsigned i = 1, e = proto.size(); i != e; ++i, ++arg) {
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std::string args = std::string(&arg, 1);
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// Wrap macro arguments in parenthesis.
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if (define)
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args = "(" + args + ")";
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@ -56,10 +56,10 @@ enum OpKind {
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enum ClassKind {
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ClassNone,
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ClassI,
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ClassS,
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ClassW,
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ClassB
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ClassI, // generic integer instruction, e.g., "i8" suffix
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ClassS, // signed/unsigned/poly, e.g., "s8", "u8" or "p8" suffix
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ClassW, // width-specific instruction, e.g., "8" suffix
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ClassB // bitcast arguments with enum argument to specify type
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};
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namespace llvm {
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