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Encode all value symtab strings as arrays of 8-bit fixed width integers,

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instead of the default inefficient encoding.  This shrinks kc++ from 4134K
to 3629K


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@36755 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Chris Lattner 2007-05-04 20:34:50 +00:00
parent 3c074f61ed
commit 2e7899dae9
1 changed files with 15 additions and 15 deletions
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26
lib/Bitcode/Writer/BitcodeWriter.cpp
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@ -267,22 +267,22 @@ static void WriteModuleInfo(const Module *M, const ValueEnumerator &VE,
// Add an abbrev for common globals with no visibility or thread localness.
BitCodeAbbrev *Abbv = new BitCodeAbbrev();
Abbv->Add(BitCodeAbbrevOp(bitc::MODULE_CODE_GLOBALVAR));
Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::FixedWidth,
Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed,
Log2_32_Ceil(MaxGlobalType+1)));
Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::FixedWidth, 1)); // Constant.
Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 1)); // Constant.
Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6)); // Initializer.
Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::FixedWidth, 3)); // Linkage.
Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 3)); // Linkage.
if (MaxAlignment == 0) // Alignment.
Abbv->Add(BitCodeAbbrevOp(0));
else {
unsigned MaxEncAlignment = Log2_32(MaxAlignment)+1;
Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::FixedWidth,
Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed,
Log2_32_Ceil(MaxEncAlignment+1)));
}
if (SectionMap.empty()) // Section.
Abbv->Add(BitCodeAbbrevOp(0));
else
Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::FixedWidth,
Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed,
Log2_32_Ceil(SectionMap.size()+1)));
// Don't bother emitting vis + thread local.
SimpleGVarAbbrev = Stream.EmitAbbrev(Abbv);
@ -703,14 +703,13 @@ static void WriteValueSymbolTable(const ValueSymbolTable &VST,
if (VST.empty()) return;
Stream.EnterSubblock(bitc::VALUE_SYMTAB_BLOCK_ID, 3);
#if 0
// 8-bit fixed width VST_ENTRY strings.
BitCodeAbbrev *Abbv = new BitCodeAbbrev();
Abbv->Add(BitCodeAbbrevOp(bitc::VST_ENTRY));
Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::FixedWidth,
Log2_32_Ceil(MaxGlobalType+1)));
// Don't bother emitting vis + thread local.
SimpleGVarAbbrev = Stream.EmitAbbrev(Abbv);
#endif
Abbv->Add(BitCodeAbbrevOp(bitc::VST_CODE_ENTRY));
Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 8));
Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Array));
Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 8));
unsigned AbbrevID = Stream.EmitAbbrev(Abbv);
// FIXME: Set up the abbrev, we know how many values there are!
@ -728,6 +727,7 @@ static void WriteValueSymbolTable(const ValueSymbolTable &VST,
Code = bitc::VST_CODE_BBENTRY;
} else {
Code = bitc::VST_CODE_ENTRY;
AbbrevToUse = AbbrevID;
}
NameVals.push_back(VE.getValueID(SI->getValue()));
@ -873,7 +873,7 @@ static void WriteBlockInfo(BitstreamWriter &Stream) {
BitCodeAbbrev *Abbv = new BitCodeAbbrev();
Abbv->Add(BitCodeAbbrevOp(bitc::VST_CODE_ENTRY));
Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 8); // Value ID
Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::FixedWidth, 3)); // Linkage.
Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 3)); // Linkage.
xxx = Stream.EmitAbbrev(Abbv);
#endif