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We always bounds check the bit set, there is no need to emit zero bytes at the end.

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llvm-svn: 135841
This commit is contained in:
Benjamin Kramer 2011-07-23 02:49:37 +00:00
parent 35d7f76497
commit cbeec9972e
1 changed files with 10 additions and 13 deletions
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23
utils/TableGen/RegisterInfoEmitter.cpp
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@ -206,23 +206,20 @@ RegisterInfoEmitter::EmitRegMapping(raw_ostream &OS,
// Helper to emit a set of bits into a constant byte array.
class BitVectorEmitter {
BitVector Values;
unsigned Len;
public:
BitVectorEmitter(unsigned L) : Len(L%8 ? ((L/8)+1)*8 : L) {
Values.resize(Len);
void add(unsigned v) {
if (v >= Values.size())
Values.resize(((v/8)+1)*8); // Round up to the next byte.
Values[v] = true;
}
void add(unsigned v) { Values[v] = true; }
void print(raw_ostream &OS) {
for (unsigned i = 0, e = Len / 8; i != e; ++i) {
for (unsigned i = 0, e = Values.size() / 8; i != e; ++i) {
unsigned char out = 0;
for (unsigned ii = 0, ie = 8; ii != ie; ++ii)
if (Values[i * 8 + ii])
out |= 1 << ii;
OS << "0x";
OS.write_hex(out);
OS << ", ";
for (unsigned j = 0; j != 8; ++j)
if (Values[i * 8 + j])
out |= 1 << j;
OS << format("0x%02x, ", out);
}
}
};
@ -349,7 +346,7 @@ RegisterInfoEmitter::runMCDesc(raw_ostream &OS, CodeGenTarget &Target,
OS << " // " << Name << " Bit set.\n"
<< " static const unsigned char " << Name
<< "Bits[] = {\n ";
BitVectorEmitter BVE(Target.getRegBank().getRegisters().size()+1);
BitVectorEmitter BVE;
for (unsigned i = 0, e = Order.size(); i != e; ++i) {
Record *Reg = Order[i];
BVE.add(Target.getRegBank().getReg(Reg)->EnumValue);