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Add abbreviations to the TYPE_BLOCK for pointers, functions, structs and arrays.

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This shrinks the type_block of kc++ from 139901 bits to 99389 bits (0.55% to 0.39%
of the file), a 40% reduction.

This shrink the record from:

  Block ID #10 (TYPE_BLOCK):
      Num Instances: 1
         Total Size: 139901b/17487.6B/4371.91W
          % of file: 0.549306
        Num Abbrevs: 0
        Num Records: 3203
      % Abbrev Recs: 0

to:

  Block ID #10 (TYPE_BLOCK):
      Num Instances: 1
         Total Size: 99389b/12423.6B/3105.91W
          % of file: 0.390862
        Num Abbrevs: 4
        Num Records: 3203
      % Abbrev Recs: 99.6566

With a common histogram of:

       Code Histogram:
                1613    POINTER
                1100    FUNCTION
                255     STRUCT
                224     ARRAY
                5       INTEGER
                2       OPAQUE
                1       LABEL
                1       DOUBLE
                1       VOID
                1       NUMENTRY


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@36776 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Chris Lattner 2007-05-05 06:30:12 +00:00
parent c42e226f08
commit d092e0e18f
1 changed files with 40 additions and 3 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

43
lib/Bitcode/Writer/BitcodeWriter.cpp
View File

@ -121,7 +121,40 @@ static void WriteTypeTable(const ValueEnumerator &VE, BitstreamWriter &Stream) {
Stream.EnterSubblock(bitc::TYPE_BLOCK_ID, 4 /*count from # abbrevs */);
SmallVector<uint64_t, 64> TypeVals;
// FIXME: Set up abbrevs now that we know the width of the type fields, etc.
// Abbrev for TYPE_CODE_POINTER.
BitCodeAbbrev *Abbv = new BitCodeAbbrev();
Abbv->Add(BitCodeAbbrevOp(bitc::TYPE_CODE_POINTER));
Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed,
Log2_32_Ceil(VE.getTypes().size()+1)));
unsigned PtrAbbrev = Stream.EmitAbbrev(Abbv);
// Abbrev for TYPE_CODE_FUNCTION.
Abbv = new BitCodeAbbrev();
Abbv->Add(BitCodeAbbrevOp(bitc::TYPE_CODE_FUNCTION));
Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 1)); // isvararg
Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed,
Log2_32_Ceil(VE.getParamAttrs().size()+1)));
Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Array));
Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed,
Log2_32_Ceil(VE.getTypes().size()+1)));
unsigned FunctionAbbrev = Stream.EmitAbbrev(Abbv);
// Abbrev for TYPE_CODE_STRUCT.
Abbv = new BitCodeAbbrev();
Abbv->Add(BitCodeAbbrevOp(bitc::TYPE_CODE_STRUCT));
Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 1)); // ispacked
Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Array));
Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed,
Log2_32_Ceil(VE.getTypes().size()+1)));
unsigned StructAbbrev = Stream.EmitAbbrev(Abbv);
// Abbrev for TYPE_CODE_ARRAY.
Abbv = new BitCodeAbbrev();
Abbv->Add(BitCodeAbbrevOp(bitc::TYPE_CODE_ARRAY));
Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 8)); // size
Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed,
Log2_32_Ceil(VE.getTypes().size()+1)));
unsigned ArrayAbbrev = Stream.EmitAbbrev(Abbv);
// Emit an entry count so the reader can reserve space.
TypeVals.push_back(TypeList.size());
@ -151,28 +184,31 @@ static void WriteTypeTable(const ValueEnumerator &VE, BitstreamWriter &Stream) {
// POINTER: [pointee type]
Code = bitc::TYPE_CODE_POINTER;
TypeVals.push_back(VE.getTypeID(cast<PointerType>(T)->getElementType()));
AbbrevToUse = PtrAbbrev;
break;
case Type::FunctionTyID: {
const FunctionType *FT = cast<FunctionType>(T);
// FUNCTION: [isvararg, attrid, #pararms, paramty x N]
// FUNCTION: [isvararg, attrid, retty, paramty x N]
Code = bitc::TYPE_CODE_FUNCTION;
TypeVals.push_back(FT->isVarArg());
TypeVals.push_back(VE.getParamAttrID(FT->getParamAttrs()));
TypeVals.push_back(VE.getTypeID(FT->getReturnType()));
for (unsigned i = 0, e = FT->getNumParams(); i != e; ++i)
TypeVals.push_back(VE.getTypeID(FT->getParamType(i)));
AbbrevToUse = FunctionAbbrev;
break;
}
case Type::StructTyID: {
const StructType *ST = cast<StructType>(T);
// STRUCT: [ispacked, #elts, eltty x N]
// STRUCT: [ispacked, eltty x N]
Code = bitc::TYPE_CODE_STRUCT;
TypeVals.push_back(ST->isPacked());
// Output all of the element types.
for (StructType::element_iterator I = ST->element_begin(),
E = ST->element_end(); I != E; ++I)
TypeVals.push_back(VE.getTypeID(*I));
AbbrevToUse = StructAbbrev;
break;
}
case Type::ArrayTyID: {
@ -181,6 +217,7 @@ static void WriteTypeTable(const ValueEnumerator &VE, BitstreamWriter &Stream) {
Code = bitc::TYPE_CODE_ARRAY;
TypeVals.push_back(AT->getNumElements());
TypeVals.push_back(VE.getTypeID(AT->getElementType()));
AbbrevToUse = ArrayAbbrev;
break;
}
case Type::VectorTyID: {