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TableGen: Optimize common string concatenation with SmallString 

llvm-svn: 288611
This commit is contained in:
Matthias Braun 2016-12-04 05:48:06 +00:00
parent 5ce9057666
commit 84bac184ea
1 changed files with 7 additions and 2 deletions
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9
llvm/lib/TableGen/Record.cpp
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@ -15,6 +15,7 @@
#include "llvm/ADT/DenseMap.h"
#include "llvm/ADT/FoldingSet.h"
#include "llvm/ADT/Hashing.h"
#include "llvm/ADT/SmallString.h"
#include "llvm/ADT/SmallVector.h"
#include "llvm/ADT/StringExtras.h"
#include "llvm/ADT/StringMap.h"
@ -839,8 +840,12 @@ Init *BinOpInit::Fold(Record *CurRec, MultiClass *CurMultiClass) const {
case STRCONCAT: {
StringInit *LHSs = dyn_cast<StringInit>(LHS);
StringInit *RHSs = dyn_cast<StringInit>(RHS);
if (LHSs && RHSs)
return StringInit::get(LHSs->getValue() + RHSs->getValue());
if (LHSs && RHSs) {
// STRCONCAT is common; Use a SmallString to avoid most heap allocations.
SmallString<80> Concat(LHSs->getValue());
Concat.append(RHSs->getValue());
return StringInit::get(Concat);
}
break;
}
case EQ: {