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add an abbrev for loads. This shrinks the function block about 50K, from:

Browse Source 
Block ID #12 (FUNCTION_BLOCK):
      Num Instances: 2344
         Total Size: 8.8434e+06b/1.10542e+06B/276356W
          % of file: 35.6726
       Average Size: 3772.78b/471.598B/117.899W
  Tot/Avg SubBlocks: 4065/1.73422
    Tot/Avg Abbrevs: 0/0
    Tot/Avg Records: 128487/54.8153
      % Abbrev Recs: 0

to:

 Block ID #12 (FUNCTION_BLOCK):
      Num Instances: 2344
         Total Size: 8.44518e+06b/1.05565e+06B/263912W
          % of file: 34.6203
       Average Size: 3602.89b/450.362B/112.59W
  Tot/Avg SubBlocks: 4065/1.73422
    Tot/Avg Abbrevs: 0/0
    Tot/Avg Records: 128487/54.8153
      % Abbrev Recs: 22.2077


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@36779 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Chris Lattner 2007-05-05 07:44:49 +00:00
parent a0f1ecc45e
commit 440168b00e
1 changed files with 22 additions and 1 deletions
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23
lib/Bitcode/Writer/BitcodeWriter.cpp
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@ -40,7 +40,10 @@ enum {
CONSTANTS_SETTYPE_ABBREV = bitc::FIRST_APPLICATION_ABBREV,
CONSTANTS_INTEGER_ABBREV,
CONSTANTS_CE_CAST_Abbrev,
CONSTANTS_NULL_Abbrev
CONSTANTS_NULL_Abbrev,
// FUNCTION_BLOCK abbrev id's.
FUNCTION_INST_LOAD_ABBREV = bitc::FIRST_APPLICATION_ABBREV
};
@ -722,6 +725,7 @@ static void WriteInstruction(const Instruction &I, ValueEnumerator &VE,
Vals.push_back(VE.getValueID(I.getOperand(0))); // ptr.
Vals.push_back(Log2_32(cast<LoadInst>(I).getAlignment())+1);
Vals.push_back(cast<LoadInst>(I).isVolatile());
AbbrevToUse = FUNCTION_INST_LOAD_ABBREV;
break;
case Instruction::Store:
Code = bitc::FUNC_CODE_INST_STORE;
@ -947,6 +951,8 @@ static void WriteBlockInfo(const ValueEnumerator &VE, BitstreamWriter &Stream) {
assert(0 && "Unexpected abbrev ordering!");
}
{ // SETTYPE abbrev for CONSTANTS_BLOCK.
BitCodeAbbrev *Abbv = new BitCodeAbbrev();
Abbv->Add(BitCodeAbbrevOp(bitc::CST_CODE_SETTYPE));
@ -986,6 +992,21 @@ static void WriteBlockInfo(const ValueEnumerator &VE, BitstreamWriter &Stream) {
assert(0 && "Unexpected abbrev ordering!");
}
// FIXME: This should only use space for first class types!
{ // INST_LOAD abbrev for FUNCTION_BLOCK.
BitCodeAbbrev *Abbv = new BitCodeAbbrev();
Abbv->Add(BitCodeAbbrevOp(bitc::FUNC_CODE_INST_LOAD));
Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, // typeid
Log2_32_Ceil(VE.getTypes().size()+1)));
Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6)); // Ptr
Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 4)); // Align
Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 1)); // volatile
if (Stream.EmitBlockInfoAbbrev(bitc::FUNCTION_BLOCK_ID,
Abbv) != FUNCTION_INST_LOAD_ABBREV)
assert(0 && "Unexpected abbrev ordering!");
}
Stream.ExitBlock();
}