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Fix a major source of compile-time slowness at -O0 -g by optimizing

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the storage of !dbg metadata kinds in the instruction themselves.
The on-the-side hash table works great for metadata that not-all
instructions get, or for metadata that only exists when optimizing.
But when compile-time is everything, it isn't great.

I'm not super thrilled with the fact that this plops a TrackingVH in
Instruction, because it grows it by 3 words.  I'm investigating 
alternatives, but this should be a step in the right direction in any
case.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@99957 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Chris Lattner
2010-03-30 23:03:27 +00:00
parent bfcd61b907
commit ec39f095f5
6 changed files with 60 additions and 17 deletions
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6
lib/VMCore/LLVMContext.cpp
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@ -26,7 +26,11 @@ LLVMContext& llvm::getGlobalContext() {
return *GlobalContext;
}
LLVMContext::LLVMContext() : pImpl(new LLVMContextImpl(*this)) { }
LLVMContext::LLVMContext() : pImpl(new LLVMContextImpl(*this)) {
// Create the first metadata kind, which is always 'dbg'.
unsigned DbgID = getMDKindID("dbg");
assert(DbgID == MD_dbg && "dbg kind id drifted"); (void)DbgID;
}
LLVMContext::~LLVMContext() { delete pImpl; }