Emit & read more compressed bytecode by not emitting a bytecodeblock for

each basic block in function.  Instead, just emit a stream of instructions,
chopping up basic blocks based on when we find terminator instructions.  This
saves a fairly substantial chunk of bytecode space.  In stripped, sample
cases, for example, we get this reduction in size:

197.parser: 163036 -> 137180:  18.8% reduction
254.gap   : 844936 -> 689392:  22.6%
255.vortex: 621724 -> 528444:  17.7%

...

Not bad for something this simple.  :)  Note that this doesn't require a new
bytecode version number at all, though version 1.1 should not need to support
the old format.

llvm-svn: 10280

1 files changed, 3 insertions, 1 deletions

diff --git a/llvm/lib/Bytecode/Reader/ReaderInternals.h b/llvm/lib/Bytecode/Reader/ReaderInternals.h
index aea45c2bed7..fd0a1ed0082 100644
--- a/llvm/lib/Bytecode/Reader/ReaderInternals.h
+++ b/llvm/lib/Bytecode/Reader/ReaderInternals.h
@@ -162,7 +162,9 @@ private:
   BasicBlock *ParseBasicBlock(const unsigned char *&Buf,
                               const unsigned char *End,
                               unsigned BlockNo);
-
+  unsigned ParseInstructionList(Function *F, const unsigned char *&Buf,
+                                const unsigned char *EndBuf);
+  
   void ParseInstruction(const unsigned char *&Buf, const unsigned char *End,
                         std::vector<unsigned> &Args, BasicBlock *BB);