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shave another 150K off of kc++, by using a 7-bit encoding for BB names

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where we can.  This shrinks kc++'s down to 3368K, with a VST record of:

  Block ID #14 (VALUE_SYMTAB):
      Num Instances: 2345
         Total Size: 1.29508e+07b/1.61885e+06B/404713W
       Average Size: 5522.73b/690.342B/172.585W
          % of file: 48.0645
  Tot/Avg SubBlocks: 0/0
    Tot/Avg Abbrevs: 7035/3
    Tot/Avg Records: 120924/51.5667
      % Abbrev Recs: 100

Isn't it nice to be able to optimizer bc size without touching the reader? :)

llvm-svn: 36759
This commit is contained in:
Chris Lattner 2007-05-04 20:58:35 +00:00
parent 2eaf2a2e40
commit b94c8f4ed8
1 changed files with 12 additions and 1 deletions
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13
lib/Bitcode/Writer/BitcodeWriter.cpp
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@ -32,7 +32,8 @@ enum {
// VALUE_SYMTAB_BLOCK abbrev id's.
VST_ENTRY_8_ABBREV = bitc::FIRST_APPLICATION_ABBREV,
VST_ENTRY_7_ABBREV
VST_ENTRY_7_ABBREV,
VST_BBENTRY_7_ABBREV
};
@ -732,6 +733,15 @@ static void WriteValueSymbolTable(const ValueSymbolTable &VST,
if (Stream.EmitAbbrev(Abbv) != VST_ENTRY_7_ABBREV)
assert(0 && "Unexpected abbrev ordering!");
}
{ // 7-bit fixed width VST_BBENTRY strings.
BitCodeAbbrev *Abbv = new BitCodeAbbrev();
Abbv->Add(BitCodeAbbrevOp(bitc::VST_CODE_BBENTRY));
Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 8));
Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Array));
Abbv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 7));
if (Stream.EmitAbbrev(Abbv) != VST_BBENTRY_7_ABBREV)
assert(0 && "Unexpected abbrev ordering!");
}
// FIXME: Set up the abbrev, we know how many values there are!
@ -759,6 +769,7 @@ static void WriteValueSymbolTable(const ValueSymbolTable &VST,
unsigned Code;
if (isa<BasicBlock>(SI->getValue())) {
Code = bitc::VST_CODE_BBENTRY;
if (is7Bit) AbbrevToUse = VST_BBENTRY_7_ABBREV;
} else {
Code = bitc::VST_CODE_ENTRY;
AbbrevToUse = is7Bit ? VST_ENTRY_7_ABBREV : VST_ENTRY_8_ABBREV;