diff options
| author | Matthias Braun <matze@braunis.de> | 2016-12-04 05:48:06 +0000 |
|---|---|---|
| committer | Matthias Braun <matze@braunis.de> | 2016-12-04 05:48:06 +0000 |
| commit | 607c68326d6351e3f88983d67f966ff2f120b344 (patch) | |
| tree | 9d67a2cd5f7a7f92b7fc70f5a422bfa446b7d483 /lib/TableGen | |
| parent | 5084450e17cfff583fbb281815e9d55ee51f2008 (diff) | |
TableGen: Optimize common string concatenation with SmallString
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@288611 91177308-0d34-0410-b5e6-96231b3b80d8
Diffstat (limited to 'lib/TableGen')
| -rw-r--r-- | lib/TableGen/Record.cpp | 9 |
1 files changed, 7 insertions, 2 deletions
diff --git a/lib/TableGen/Record.cpp b/lib/TableGen/Record.cpp index 3e1be837039..a82c38186db 100644 --- a/lib/TableGen/Record.cpp +++ b/lib/TableGen/Record.cpp @@ -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: { |