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Add support for writing bytecode files with compactiontables for bytecode files.

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This shrinks the bytecode file for 176.gcc by about 200K (10%), and 254.gap by
about 167K, a 25% reduction.  There is still a lot of room for improvement in
the encoding of the compaction table.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@10915 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Chris Lattner
2004-01-18 21:08:52 +00:00
parent 89e025387e
commit cf3e67f70a
4 changed files with 73 additions and 36 deletions
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7
lib/Bytecode/Writer/InstructionWriter.cpp
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@@ -202,7 +202,7 @@ static void outputInstructionFormat3(const Instruction *I, unsigned Opcode,
output(Bits, Out);
}
void BytecodeWriter::processInstruction(const Instruction &I) {
void BytecodeWriter::outputInstruction(const Instruction &I) {
assert(I.getOpcode() < 62 && "Opcode too big???");
unsigned Opcode = I.getOpcode();
@@ -216,9 +216,8 @@ void BytecodeWriter::processInstruction(const Instruction &I) {
int MaxOpSlot = 0;
int Slots[3]; Slots[0] = (1 << 12)-1; // Marker to signify 0 operands
for (unsigned i = 0; i < NumOperands; ++i) {
const Value *Def = I.getOperand(i);
int slot = Table.getSlot(Def);
for (unsigned i = 0; i != NumOperands; ++i) {
int slot = Table.getSlot(I.getOperand(i));
assert(slot != -1 && "Broken bytecode!");
if (slot > MaxOpSlot) MaxOpSlot = slot;
if (i < 3) Slots[i] = slot;