Implement new cast creation functions for both instructions and constant

expressions. These will get used to reduce clutter as we replace various
calls to createInferredCast and getCast.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@32191 91177308-0d34-0410-b5e6-96231b3b80d8

1 files changed, 48 insertions, 0 deletions

diff --git a/lib/VMCore/Instructions.cpp b/lib/VMCore/Instructions.cpp
index de1ebce..8c1f47d 100644
--- a/lib/VMCore/Instructions.cpp
+++ b/lib/VMCore/Instructions.cpp
@@ -1500,6 +1500,54 @@ CastInst *CastInst::create(Instruction::CastOps op, Value *S, const Type *Ty,
   return 0;
 }
 
+CastInst *CastInst::createZExtOrBitCast(Value *S, const Type *Ty, 
+                                        const std::string &Name,
+                                        Instruction *InsertBefore) {
+  if (S->getType()->getPrimitiveSizeInBits() == Ty->getPrimitiveSizeInBits())
+    return create(Instruction::BitCast, S, Ty, Name, InsertBefore);
+  return create(Instruction::ZExt, S, Ty, Name, InsertBefore);
+}
+
+CastInst *CastInst::createZExtOrBitCast(Value *S, const Type *Ty, 
+                                        const std::string &Name,
+                                        BasicBlock *InsertAtEnd) {
+  if (S->getType()->getPrimitiveSizeInBits() == Ty->getPrimitiveSizeInBits())
+    return create(Instruction::BitCast, S, Ty, Name, InsertAtEnd);
+  return create(Instruction::ZExt, S, Ty, Name, InsertAtEnd);
+}
+
+CastInst *CastInst::createSExtOrBitCast(Value *S, const Type *Ty, 
+                                        const std::string &Name,
+                                        Instruction *InsertBefore) {
+  if (S->getType()->getPrimitiveSizeInBits() == Ty->getPrimitiveSizeInBits())
+    return create(Instruction::BitCast, S, Ty, Name, InsertBefore);
+  return create(Instruction::SExt, S, Ty, Name, InsertBefore);
+}
+
+CastInst *CastInst::createSExtOrBitCast(Value *S, const Type *Ty, 
+                                        const std::string &Name,
+                                        BasicBlock *InsertAtEnd) {
+  if (S->getType()->getPrimitiveSizeInBits() == Ty->getPrimitiveSizeInBits())
+    return create(Instruction::BitCast, S, Ty, Name, InsertAtEnd);
+  return create(Instruction::SExt, S, Ty, Name, InsertAtEnd);
+}
+
+CastInst *CastInst::createTruncOrBitCast(Value *S, const Type *Ty,
+                                         const std::string &Name,
+                                         Instruction *InsertBefore) {
+  if (S->getType()->getPrimitiveSizeInBits() == Ty->getPrimitiveSizeInBits())
+    return create(Instruction::BitCast, S, Ty, Name, InsertBefore);
+  return create(Instruction::Trunc, S, Ty, Name, InsertBefore);
+}
+
+CastInst *CastInst::createTruncOrBitCast(Value *S, const Type *Ty,
+                                         const std::string &Name, 
+                                         BasicBlock *InsertAtEnd) {
+  if (S->getType()->getPrimitiveSizeInBits() == Ty->getPrimitiveSizeInBits())
+    return create(Instruction::BitCast, S, Ty, Name, InsertAtEnd);
+  return create(Instruction::Trunc, S, Ty, Name, InsertAtEnd);
+}
+
 // Provide a way to get a "cast" where the cast opcode is inferred from the 
 // types and size of the operand. This, basically, is a parallel of the 
 // logic in the checkCast function below.  This axiom should hold: