blob: 11ab3e0927d2e70e233605dd5989d217a5c61c50 (
plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
|
//===-- OrderedInstructions.cpp - Instruction dominance function ---------===//
//
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
// See https://llvm.org/LICENSE.txt for license information.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
//
//===----------------------------------------------------------------------===//
//
// This file defines utility to check dominance relation of 2 instructions.
//
//===----------------------------------------------------------------------===//
#include "llvm/Analysis/OrderedInstructions.h"
using namespace llvm;
bool OrderedInstructions::localDominates(const Instruction *InstA,
const Instruction *InstB) const {
assert(InstA->getParent() == InstB->getParent() &&
"Instructions must be in the same basic block");
return InstA->comesBefore(InstB);
}
/// Given 2 instructions, check for dominance relation if the instructions are
/// in the same basic block. Otherwise, use dominator tree.
bool OrderedInstructions::dominates(const Instruction *InstA,
const Instruction *InstB) const {
// Use ordered basic block to do dominance check in case the 2 instructions
// are in the same basic block.
if (InstA->getParent() == InstB->getParent())
return localDominates(InstA, InstB);
return DT->dominates(InstA->getParent(), InstB->getParent());
}
bool OrderedInstructions::dfsBefore(const Instruction *InstA,
const Instruction *InstB) const {
// Use ordered basic block in case the 2 instructions are in the same basic
// block.
if (InstA->getParent() == InstB->getParent())
return localDominates(InstA, InstB);
DomTreeNode *DA = DT->getNode(InstA->getParent());
DomTreeNode *DB = DT->getNode(InstB->getParent());
return DA->getDFSNumIn() < DB->getDFSNumIn();
}
|
