1//===- PtrUseVisitor.cpp - InstVisitors over a pointers uses --------------===//
2//
3// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
4// See https://llvm.org/LICENSE.txt for license information.
5// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
6//
7//===----------------------------------------------------------------------===//
8//
9/// \file
10/// Implementation of the pointer use visitors.
11//
12//===----------------------------------------------------------------------===//
13
14#include "llvm/Analysis/PtrUseVisitor.h"
15#include "llvm/IR/Instruction.h"
16#include "llvm/IR/Instructions.h"
17
18using namespace llvm;
19
20void detail::PtrUseVisitorBase::enqueueUsers(Value &I) {
21 for (Use &U : I.uses()) {
22 if (VisitedUses.insert(Ptr: &U).second) {
23 UseToVisit NewU = {
24 .UseAndIsOffsetKnown: UseToVisit::UseAndIsOffsetKnownPair(&U, IsOffsetKnown),
25 .Offset: Offset
26 };
27 Worklist.push_back(Elt: std::move(NewU));
28 }
29 }
30}
31
32bool detail::PtrUseVisitorBase::adjustOffsetForGEP(GetElementPtrInst &GEPI) {
33 if (!IsOffsetKnown)
34 return false;
35
36 APInt TmpOffset(DL.getIndexTypeSizeInBits(Ty: GEPI.getType()), 0);
37 if (GEPI.accumulateConstantOffset(DL, Offset&: TmpOffset)) {
38 Offset += TmpOffset.sextOrTrunc(width: Offset.getBitWidth());
39 return true;
40 }
41
42 return false;
43}
44