Rework the routines that convert AP[S]Int into a string. Now, instead of

returning an std::string by value, it fills in a SmallString/SmallVector
passed in.  This significantly reduces string thrashing in some cases.

More specifically, this:
 - Adds an operator<< and a print method for APInt that allows you to 
   directly send them to an ostream.
 - Reimplements APInt::toString to be much simpler and more efficient
   algorithmically in addition to not thrashing strings quite as much.

This speeds up llvm-dis on kc++ by 7%, and may also slightly speed up the
asmprinter.  This also fixes a bug I introduced into the asmwriter in a
previous patch w.r.t. alias printing.

llvm-svn: 54873

1 files changed, 3 insertions, 5 deletions

diff --git a/llvm/lib/Transforms/Utils/LowerSwitch.cpp b/llvm/lib/Transforms/Utils/LowerSwitch.cpp
index 630f97c..7409e77 100644
--- a/llvm/lib/Transforms/Utils/LowerSwitch.cpp
+++ b/llvm/lib/Transforms/Utils/LowerSwitch.cpp
@@ -144,11 +144,9 @@ BasicBlock* LowerSwitch::switchConvert(CaseItr Begin, CaseItr End,
   DOUT << "RHS: " << RHS << "\n";
 
   CaseRange& Pivot = *(Begin + Mid);
-  DEBUG( DOUT << "Pivot ==> " 
-              << cast<ConstantInt>(Pivot.Low)->getValue().toStringSigned(10)
-              << " -"
-              << cast<ConstantInt>(Pivot.High)->getValue().toStringSigned(10)
-              << "\n");
+  DEBUG(cerr << "Pivot ==> " 
+             << cast<ConstantInt>(Pivot.Low)->getValue() << " -"
+             << cast<ConstantInt>(Pivot.High)->getValue() << "\n");
 
   BasicBlock* LBranch = switchConvert(LHS.begin(), LHS.end(), Val,
                                       OrigBlock, Default);