Make StripPointerCast a common function (should we mak it method of Value instead?)
llvm-svn: 50775
diff --git a/llvm/lib/VMCore/Value.cpp b/llvm/lib/VMCore/Value.cpp
index e55e558..93a7151 100644
--- a/llvm/lib/VMCore/Value.cpp
+++ b/llvm/lib/VMCore/Value.cpp
@@ -12,6 +12,7 @@
//===----------------------------------------------------------------------===//
#include "llvm/Constant.h"
+#include "llvm/Constants.h"
#include "llvm/DerivedTypes.h"
#include "llvm/InstrTypes.h"
#include "llvm/Instructions.h"
@@ -331,3 +332,30 @@
}
}
+//===----------------------------------------------------------------------===//
+// Utility functions
+//===----------------------------------------------------------------------===//
+
+Value *llvm::StripPointerCasts(Value *Ptr) {
+ if (ConstantExpr *CE = dyn_cast<ConstantExpr>(Ptr)) {
+ if (CE->getOpcode() == Instruction::BitCast) {
+ if (isa<PointerType>(CE->getOperand(0)->getType()))
+ return StripPointerCasts(CE->getOperand(0));
+ } else if (CE->getOpcode() == Instruction::GetElementPtr) {
+ for (unsigned i = 1, e = CE->getNumOperands(); i != e; ++i)
+ if (!CE->getOperand(i)->isNullValue())
+ return Ptr;
+ return StripPointerCasts(CE->getOperand(0));
+ }
+ return Ptr;
+ }
+
+ if (BitCastInst *CI = dyn_cast<BitCastInst>(Ptr)) {
+ if (isa<PointerType>(CI->getOperand(0)->getType()))
+ return StripPointerCasts(CI->getOperand(0));
+ } else if (GetElementPtrInst *GEP = dyn_cast<GetElementPtrInst>(Ptr)) {
+ if (GEP->hasAllZeroIndices())
+ return StripPointerCasts(GEP->getOperand(0));
+ }
+ return Ptr;
+}