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| author | Chris Lattner <sabre@nondot.org> | 2007-05-04 20:58:35 +0000 |
|---|---|---|
| committer | Chris Lattner <sabre@nondot.org> | 2007-05-04 20:58:35 +0000 |
| commit | fd1ad10e61b8bf6affff37dd0a86bb8ff9dc2161 (patch) | |
| tree | 9a1e75b1d657c830aeb16c11124998dc91acfe6d /llvm/lib/Bitcode | |
| parent | 4d92598ab090a67204dce41ea83f7566b8c552fb (diff) | |
| download | bcm5719-llvm-fd1ad10e61b8bf6affff37dd0a86bb8ff9dc2161.tar.gz bcm5719-llvm-fd1ad10e61b8bf6affff37dd0a86bb8ff9dc2161.zip | |
shave another 150K off of kc++, by using a 7-bit encoding for BB names
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
Diffstat (limited to 'llvm/lib/Bitcode')
| -rw-r--r-- | llvm/lib/Bitcode/Writer/BitcodeWriter.cpp | 13 |
1 files changed, 12 insertions, 1 deletions
diff --git a/llvm/lib/Bitcode/Writer/BitcodeWriter.cpp b/llvm/lib/Bitcode/Writer/BitcodeWriter.cpp index 172db3ac785..938be87b452 100644 --- a/llvm/lib/Bitcode/Writer/BitcodeWriter.cpp +++ b/llvm/lib/Bitcode/Writer/BitcodeWriter.cpp @@ -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; |
