Add pointer arithmetic helper function.
Change-Id: I735295c715564093db6d6e6aaaeb05914e0e826e
diff --git a/src/compiler_llvm/ir_builder.h b/src/compiler_llvm/ir_builder.h
index 03ca2d7..2b4095c 100644
--- a/src/compiler_llvm/ir_builder.h
+++ b/src/compiler_llvm/ir_builder.h
@@ -46,6 +46,50 @@
//--------------------------------------------------------------------------
+ // Pointer Arithmetic Helper Function
+ //--------------------------------------------------------------------------
+
+ llvm::IntegerType* getPtrEquivIntTy() {
+ return getInt32Ty();
+ }
+
+ size_t getSizeOfPtrEquivInt() {
+ return 4;
+ }
+
+ llvm::ConstantInt* getSizeOfPtrEquivIntValue() {
+ return getPtrEquivInt(getSizeOfPtrEquivInt());
+ }
+
+ llvm::ConstantInt* getPtrEquivInt(uint64_t i) {
+ return llvm::ConstantInt::get(getPtrEquivIntTy(), i);
+ }
+
+ llvm::Value* CreatePtrDisp(llvm::Value* base,
+ llvm::Value* offset,
+ llvm::PointerType* ret_ty) {
+
+ llvm::Value* base_int = CreatePtrToInt(base, getPtrEquivIntTy());
+ llvm::Value* result_int = CreateAdd(base_int, offset);
+ llvm::Value* result = CreateIntToPtr(result_int, ret_ty);
+
+ return result;
+ }
+
+ llvm::Value* CreatePtrDisp(llvm::Value* base,
+ llvm::Value* bs,
+ llvm::Value* count,
+ llvm::Value* offset,
+ llvm::PointerType* ret_ty) {
+
+ llvm::Value* block_offset = CreateMul(bs, count);
+ llvm::Value* total_offset = CreateAdd(block_offset, offset);
+
+ return CreatePtrDisp(base, total_offset, ret_ty);
+ }
+
+
+ //--------------------------------------------------------------------------
// Type Helper Function
//--------------------------------------------------------------------------
