Ordinary patch for PR1255.

Added new case-ranges orientated methods for adding/removing cases in SwitchInst. After this patch cases will internally representated as ConstantArray-s instead of ConstantInt, externally cases wrapped within the ConstantRangesSet object.
Old methods of SwitchInst are also works well, but marked as deprecated. So on this stage we have no side effects except that I added support for case ranges in BitcodeReader/Writer, of course test for Bitcode is also added. Old "switch" format is also supported.

llvm-svn: 156374

1 files changed, 8 insertions, 1 deletions

diff --git a/llvm/lib/VMCore/Instructions.cpp b/llvm/lib/VMCore/Instructions.cpp
index 6c5db328764..819a090cc3c 100644
--- a/llvm/lib/VMCore/Instructions.cpp
+++ b/llvm/lib/VMCore/Instructions.cpp
@@ -3169,6 +3169,13 @@ SwitchInst::~SwitchInst() {
 /// addCase - Add an entry to the switch instruction...
 ///
 void SwitchInst::addCase(ConstantInt *OnVal, BasicBlock *Dest) {
+  CRSBuilder CB;
+  CB.add(OnVal);
+  ConstantRangesSet CRS = CB.getCase();
+  addCase(CRS, Dest);
+}
+
+void SwitchInst::addCase(ConstantRangesSet& OnVal, BasicBlock *Dest) {
   unsigned NewCaseIdx = getNumCases(); 
   unsigned OpNo = NumOperands;
   if (OpNo+2 > ReservedSpace)
@@ -3177,7 +3184,7 @@ void SwitchInst::addCase(ConstantInt *OnVal, BasicBlock *Dest) {
   assert(OpNo+1 < ReservedSpace && "Growing didn't work!");
   NumOperands = OpNo+2;
   CaseIt Case(this, NewCaseIdx);
-  Case.setValue(OnVal);
+  Case.setValueEx(OnVal);
   Case.setSuccessor(Dest);
 }