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llvm-mirror/unittests/IR/ConstantRangeTest.cpp
Nikita Popov 389d1ed239 [ConstantRange] Add overflow check helpers 
Add functions to ConstantRange that determine whether the
unsigned/signed addition/subtraction of two ConstantRanges
may/always/never overflows. This will allow checking overflow
conditions based on known constant ranges in addition to known bits.

I'm implementing these methods on ConstantRange to allow them to be
unit tested independently of any ValueTracking machinery. The tests
include exhaustive testing on 4-bit ranges, to make sure the result
is both conservatively correct and maximally precise.

The OverflowResult enum is redeclared on ConstantRange, because
I wanted to avoid a dependency in either direction between
ValueTracking.h and ConstantRange.h.

Differential Revision: https://reviews.llvm.org/D59193

llvm-svn: 356276
2019-03-15 17:29:05 +00:00

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//===- ConstantRangeTest.cpp - ConstantRange tests ------------------------===//
//
// 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
//
//===----------------------------------------------------------------------===//
#include "llvm/IR/ConstantRange.h"
#include "llvm/IR/Instructions.h"
#include "llvm/IR/Operator.h"
#include "gtest/gtest.h"
using namespace llvm;
namespace {
class ConstantRangeTest : public ::testing::Test {
protected:
static ConstantRange Full;
static ConstantRange Empty;
static ConstantRange One;
static ConstantRange Some;
static ConstantRange Wrap;
};
ConstantRange ConstantRangeTest::Full(16);
ConstantRange ConstantRangeTest::Empty(16, false);
ConstantRange ConstantRangeTest::One(APInt(16, 0xa));
ConstantRange ConstantRangeTest::Some(APInt(16, 0xa), APInt(16, 0xaaa));
ConstantRange ConstantRangeTest::Wrap(APInt(16, 0xaaa), APInt(16, 0xa));
TEST_F(ConstantRangeTest, Basics) {
EXPECT_TRUE(Full.isFullSet());
EXPECT_FALSE(Full.isEmptySet());
EXPECT_TRUE(Full.inverse().isEmptySet());
EXPECT_FALSE(Full.isWrappedSet());
EXPECT_TRUE(Full.contains(APInt(16, 0x0)));
EXPECT_TRUE(Full.contains(APInt(16, 0x9)));
EXPECT_TRUE(Full.contains(APInt(16, 0xa)));
EXPECT_TRUE(Full.contains(APInt(16, 0xaa9)));
EXPECT_TRUE(Full.contains(APInt(16, 0xaaa)));
EXPECT_FALSE(Empty.isFullSet());
EXPECT_TRUE(Empty.isEmptySet());
EXPECT_TRUE(Empty.inverse().isFullSet());
EXPECT_FALSE(Empty.isWrappedSet());
EXPECT_FALSE(Empty.contains(APInt(16, 0x0)));
EXPECT_FALSE(Empty.contains(APInt(16, 0x9)));
EXPECT_FALSE(Empty.contains(APInt(16, 0xa)));
EXPECT_FALSE(Empty.contains(APInt(16, 0xaa9)));
EXPECT_FALSE(Empty.contains(APInt(16, 0xaaa)));
EXPECT_FALSE(One.isFullSet());
EXPECT_FALSE(One.isEmptySet());
EXPECT_FALSE(One.isWrappedSet());
EXPECT_FALSE(One.contains(APInt(16, 0x0)));
EXPECT_FALSE(One.contains(APInt(16, 0x9)));
EXPECT_TRUE(One.contains(APInt(16, 0xa)));
EXPECT_FALSE(One.contains(APInt(16, 0xaa9)));
EXPECT_FALSE(One.contains(APInt(16, 0xaaa)));
EXPECT_FALSE(One.inverse().contains(APInt(16, 0xa)));
EXPECT_FALSE(Some.isFullSet());
EXPECT_FALSE(Some.isEmptySet());
EXPECT_FALSE(Some.isWrappedSet());
EXPECT_FALSE(Some.contains(APInt(16, 0x0)));
EXPECT_FALSE(Some.contains(APInt(16, 0x9)));
EXPECT_TRUE(Some.contains(APInt(16, 0xa)));
EXPECT_TRUE(Some.contains(APInt(16, 0xaa9)));
EXPECT_FALSE(Some.contains(APInt(16, 0xaaa)));
EXPECT_FALSE(Wrap.isFullSet());
EXPECT_FALSE(Wrap.isEmptySet());
EXPECT_TRUE(Wrap.isWrappedSet());
EXPECT_TRUE(Wrap.contains(APInt(16, 0x0)));
EXPECT_TRUE(Wrap.contains(APInt(16, 0x9)));
EXPECT_FALSE(Wrap.contains(APInt(16, 0xa)));
EXPECT_FALSE(Wrap.contains(APInt(16, 0xaa9)));
EXPECT_TRUE(Wrap.contains(APInt(16, 0xaaa)));
}
TEST_F(ConstantRangeTest, Equality) {
EXPECT_EQ(Full, Full);
EXPECT_EQ(Empty, Empty);
EXPECT_EQ(One, One);
EXPECT_EQ(Some, Some);
EXPECT_EQ(Wrap, Wrap);
EXPECT_NE(Full, Empty);
EXPECT_NE(Full, One);
EXPECT_NE(Full, Some);
EXPECT_NE(Full, Wrap);
EXPECT_NE(Empty, One);
EXPECT_NE(Empty, Some);
EXPECT_NE(Empty, Wrap);
EXPECT_NE(One, Some);
EXPECT_NE(One, Wrap);
EXPECT_NE(Some, Wrap);
}
TEST_F(ConstantRangeTest, SingleElement) {
EXPECT_EQ(Full.getSingleElement(), static_cast<APInt *>(nullptr));
EXPECT_EQ(Empty.getSingleElement(), static_cast<APInt *>(nullptr));
EXPECT_EQ(Full.getSingleMissingElement(), static_cast<APInt *>(nullptr));
EXPECT_EQ(Empty.getSingleMissingElement(), static_cast<APInt *>(nullptr));
EXPECT_EQ(*One.getSingleElement(), APInt(16, 0xa));
EXPECT_EQ(Some.getSingleElement(), static_cast<APInt *>(nullptr));
EXPECT_EQ(Wrap.getSingleElement(), static_cast<APInt *>(nullptr));
EXPECT_EQ(One.getSingleMissingElement(), static_cast<APInt *>(nullptr));
EXPECT_EQ(Some.getSingleMissingElement(), static_cast<APInt *>(nullptr));
ConstantRange OneInverse = One.inverse();
EXPECT_EQ(*OneInverse.getSingleMissingElement(), *One.getSingleElement());
EXPECT_FALSE(Full.isSingleElement());
EXPECT_FALSE(Empty.isSingleElement());
EXPECT_TRUE(One.isSingleElement());
EXPECT_FALSE(Some.isSingleElement());
EXPECT_FALSE(Wrap.isSingleElement());
}
TEST_F(ConstantRangeTest, GetSetSize) {
EXPECT_EQ(Full.getSetSize(), APInt(17, 65536));
EXPECT_EQ(Empty.getSetSize(), APInt(17, 0));
EXPECT_EQ(One.getSetSize(), APInt(17, 1));
EXPECT_EQ(Some.getSetSize(), APInt(17, 0xaa0));
ConstantRange Wrap(APInt(4, 7), APInt(4, 3));
ConstantRange Wrap2(APInt(4, 8), APInt(4, 7));
EXPECT_EQ(Wrap.getSetSize(), APInt(5, 12));
EXPECT_EQ(Wrap2.getSetSize(), APInt(5, 15));
}
TEST_F(ConstantRangeTest, GetMinsAndMaxes) {
EXPECT_EQ(Full.getUnsignedMax(), APInt(16, UINT16_MAX));
EXPECT_EQ(One.getUnsignedMax(), APInt(16, 0xa));
EXPECT_EQ(Some.getUnsignedMax(), APInt(16, 0xaa9));
EXPECT_EQ(Wrap.getUnsignedMax(), APInt(16, UINT16_MAX));
EXPECT_EQ(Full.getUnsignedMin(), APInt(16, 0));
EXPECT_EQ(One.getUnsignedMin(), APInt(16, 0xa));
EXPECT_EQ(Some.getUnsignedMin(), APInt(16, 0xa));
EXPECT_EQ(Wrap.getUnsignedMin(), APInt(16, 0));
EXPECT_EQ(Full.getSignedMax(), APInt(16, INT16_MAX));
EXPECT_EQ(One.getSignedMax(), APInt(16, 0xa));
EXPECT_EQ(Some.getSignedMax(), APInt(16, 0xaa9));
EXPECT_EQ(Wrap.getSignedMax(), APInt(16, INT16_MAX));
EXPECT_EQ(Full.getSignedMin(), APInt(16, (uint64_t)INT16_MIN));
EXPECT_EQ(One.getSignedMin(), APInt(16, 0xa));
EXPECT_EQ(Some.getSignedMin(), APInt(16, 0xa));
EXPECT_EQ(Wrap.getSignedMin(), APInt(16, (uint64_t)INT16_MIN));
// Found by Klee
EXPECT_EQ(ConstantRange(APInt(4, 7), APInt(4, 0)).getSignedMax(),
APInt(4, 7));
}
TEST_F(ConstantRangeTest, SignWrapped) {
EXPECT_TRUE(Full.isSignWrappedSet());
EXPECT_FALSE(Empty.isSignWrappedSet());
EXPECT_FALSE(One.isSignWrappedSet());
EXPECT_FALSE(Some.isSignWrappedSet());
EXPECT_TRUE(Wrap.isSignWrappedSet());
EXPECT_FALSE(ConstantRange(APInt(8, 127), APInt(8, 128)).isSignWrappedSet());
EXPECT_TRUE(ConstantRange(APInt(8, 127), APInt(8, 129)).isSignWrappedSet());
EXPECT_FALSE(ConstantRange(APInt(8, 128), APInt(8, 129)).isSignWrappedSet());
EXPECT_TRUE(ConstantRange(APInt(8, 10), APInt(8, 9)).isSignWrappedSet());
EXPECT_TRUE(ConstantRange(APInt(8, 10), APInt(8, 250)).isSignWrappedSet());
EXPECT_FALSE(ConstantRange(APInt(8, 250), APInt(8, 10)).isSignWrappedSet());
EXPECT_FALSE(ConstantRange(APInt(8, 250), APInt(8, 251)).isSignWrappedSet());
}
TEST_F(ConstantRangeTest, Trunc) {
ConstantRange TFull = Full.truncate(10);
ConstantRange TEmpty = Empty.truncate(10);
ConstantRange TOne = One.truncate(10);
ConstantRange TSome = Some.truncate(10);
ConstantRange TWrap = Wrap.truncate(10);
EXPECT_TRUE(TFull.isFullSet());
EXPECT_TRUE(TEmpty.isEmptySet());
EXPECT_EQ(TOne, ConstantRange(One.getLower().trunc(10),
One.getUpper().trunc(10)));
EXPECT_TRUE(TSome.isFullSet());
EXPECT_TRUE(TWrap.isFullSet());
// trunc([2, 5), 3->2) = [2, 1)
ConstantRange TwoFive(APInt(3, 2), APInt(3, 5));
EXPECT_EQ(TwoFive.truncate(2), ConstantRange(APInt(2, 2), APInt(2, 1)));
// trunc([2, 6), 3->2) = full
ConstantRange TwoSix(APInt(3, 2), APInt(3, 6));
EXPECT_TRUE(TwoSix.truncate(2).isFullSet());
// trunc([5, 7), 3->2) = [1, 3)
ConstantRange FiveSeven(APInt(3, 5), APInt(3, 7));
EXPECT_EQ(FiveSeven.truncate(2), ConstantRange(APInt(2, 1), APInt(2, 3)));
// trunc([7, 1), 3->2) = [3, 1)
ConstantRange SevenOne(APInt(3, 7), APInt(3, 1));
EXPECT_EQ(SevenOne.truncate(2), ConstantRange(APInt(2, 3), APInt(2, 1)));
}
TEST_F(ConstantRangeTest, ZExt) {
ConstantRange ZFull = Full.zeroExtend(20);
ConstantRange ZEmpty = Empty.zeroExtend(20);
ConstantRange ZOne = One.zeroExtend(20);
ConstantRange ZSome = Some.zeroExtend(20);
ConstantRange ZWrap = Wrap.zeroExtend(20);
EXPECT_EQ(ZFull, ConstantRange(APInt(20, 0), APInt(20, 0x10000)));
EXPECT_TRUE(ZEmpty.isEmptySet());
EXPECT_EQ(ZOne, ConstantRange(One.getLower().zext(20),
One.getUpper().zext(20)));
EXPECT_EQ(ZSome, ConstantRange(Some.getLower().zext(20),
Some.getUpper().zext(20)));
EXPECT_EQ(ZWrap, ConstantRange(APInt(20, 0), APInt(20, 0x10000)));
// zext([5, 0), 3->7) = [5, 8)
ConstantRange FiveZero(APInt(3, 5), APInt(3, 0));
EXPECT_EQ(FiveZero.zeroExtend(7), ConstantRange(APInt(7, 5), APInt(7, 8)));
}
TEST_F(ConstantRangeTest, SExt) {
ConstantRange SFull = Full.signExtend(20);
ConstantRange SEmpty = Empty.signExtend(20);
ConstantRange SOne = One.signExtend(20);
ConstantRange SSome = Some.signExtend(20);
ConstantRange SWrap = Wrap.signExtend(20);
EXPECT_EQ(SFull, ConstantRange(APInt(20, (uint64_t)INT16_MIN, true),
APInt(20, INT16_MAX + 1, true)));
EXPECT_TRUE(SEmpty.isEmptySet());
EXPECT_EQ(SOne, ConstantRange(One.getLower().sext(20),
One.getUpper().sext(20)));
EXPECT_EQ(SSome, ConstantRange(Some.getLower().sext(20),
Some.getUpper().sext(20)));
EXPECT_EQ(SWrap, ConstantRange(APInt(20, (uint64_t)INT16_MIN, true),
APInt(20, INT16_MAX + 1, true)));
EXPECT_EQ(ConstantRange(APInt(8, 120), APInt(8, 140)).signExtend(16),
ConstantRange(APInt(16, -128), APInt(16, 128)));
EXPECT_EQ(ConstantRange(APInt(16, 0x0200), APInt(16, 0x8000)).signExtend(19),
ConstantRange(APInt(19, 0x0200), APInt(19, 0x8000)));
}
TEST_F(ConstantRangeTest, IntersectWith) {
EXPECT_EQ(Empty.intersectWith(Full), Empty);
EXPECT_EQ(Empty.intersectWith(Empty), Empty);
EXPECT_EQ(Empty.intersectWith(One), Empty);
EXPECT_EQ(Empty.intersectWith(Some), Empty);
EXPECT_EQ(Empty.intersectWith(Wrap), Empty);
EXPECT_EQ(Full.intersectWith(Full), Full);
EXPECT_EQ(Some.intersectWith(Some), Some);
EXPECT_EQ(Some.intersectWith(One), One);
EXPECT_EQ(Full.intersectWith(One), One);
EXPECT_EQ(Full.intersectWith(Some), Some);
EXPECT_EQ(Some.intersectWith(Wrap), Empty);
EXPECT_EQ(One.intersectWith(Wrap), Empty);
EXPECT_EQ(One.intersectWith(Wrap), Wrap.intersectWith(One));
// Klee generated testcase from PR4545.
// The intersection of i16 [4, 2) and [6, 5) is disjoint, looking like
// 01..4.6789ABCDEF where the dots represent values not in the intersection.
ConstantRange LHS(APInt(16, 4), APInt(16, 2));
ConstantRange RHS(APInt(16, 6), APInt(16, 5));
EXPECT_TRUE(LHS.intersectWith(RHS) == LHS);
// previous bug: intersection of [min, 3) and [2, max) should be 2
LHS = ConstantRange(APInt(32, -2147483646), APInt(32, 3));
RHS = ConstantRange(APInt(32, 2), APInt(32, 2147483646));
EXPECT_EQ(LHS.intersectWith(RHS), ConstantRange(APInt(32, 2)));
// [2, 0) /\ [4, 3) = [2, 0)
LHS = ConstantRange(APInt(32, 2), APInt(32, 0));
RHS = ConstantRange(APInt(32, 4), APInt(32, 3));
EXPECT_EQ(LHS.intersectWith(RHS), ConstantRange(APInt(32, 2), APInt(32, 0)));
// [2, 0) /\ [4, 2) = [4, 0)
LHS = ConstantRange(APInt(32, 2), APInt(32, 0));
RHS = ConstantRange(APInt(32, 4), APInt(32, 2));
EXPECT_EQ(LHS.intersectWith(RHS), ConstantRange(APInt(32, 4), APInt(32, 0)));
// [4, 2) /\ [5, 1) = [5, 1)
LHS = ConstantRange(APInt(32, 4), APInt(32, 2));
RHS = ConstantRange(APInt(32, 5), APInt(32, 1));
EXPECT_EQ(LHS.intersectWith(RHS), ConstantRange(APInt(32, 5), APInt(32, 1)));
// [2, 0) /\ [7, 4) = [7, 4)
LHS = ConstantRange(APInt(32, 2), APInt(32, 0));
RHS = ConstantRange(APInt(32, 7), APInt(32, 4));
EXPECT_EQ(LHS.intersectWith(RHS), ConstantRange(APInt(32, 7), APInt(32, 4)));
// [4, 2) /\ [1, 0) = [1, 0)
LHS = ConstantRange(APInt(32, 4), APInt(32, 2));
RHS = ConstantRange(APInt(32, 1), APInt(32, 0));
EXPECT_EQ(LHS.intersectWith(RHS), ConstantRange(APInt(32, 4), APInt(32, 2)));
// [15, 0) /\ [7, 6) = [15, 0)
LHS = ConstantRange(APInt(32, 15), APInt(32, 0));
RHS = ConstantRange(APInt(32, 7), APInt(32, 6));
EXPECT_EQ(LHS.intersectWith(RHS), ConstantRange(APInt(32, 15), APInt(32, 0)));
}
TEST_F(ConstantRangeTest, UnionWith) {
EXPECT_EQ(Wrap.unionWith(One),
ConstantRange(APInt(16, 0xaaa), APInt(16, 0xb)));
EXPECT_EQ(One.unionWith(Wrap), Wrap.unionWith(One));
EXPECT_EQ(Empty.unionWith(Empty), Empty);
EXPECT_EQ(Full.unionWith(Full), Full);
EXPECT_EQ(Some.unionWith(Wrap), Full);
// PR4545
EXPECT_EQ(ConstantRange(APInt(16, 14), APInt(16, 1)).unionWith(
ConstantRange(APInt(16, 0), APInt(16, 8))),
ConstantRange(APInt(16, 14), APInt(16, 8)));
EXPECT_EQ(ConstantRange(APInt(16, 6), APInt(16, 4)).unionWith(
ConstantRange(APInt(16, 4), APInt(16, 0))),
ConstantRange(16));
EXPECT_EQ(ConstantRange(APInt(16, 1), APInt(16, 0)).unionWith(
ConstantRange(APInt(16, 2), APInt(16, 1))),
ConstantRange(16));
}
TEST_F(ConstantRangeTest, SetDifference) {
EXPECT_EQ(Full.difference(Empty), Full);
EXPECT_EQ(Full.difference(Full), Empty);
EXPECT_EQ(Empty.difference(Empty), Empty);
EXPECT_EQ(Empty.difference(Full), Empty);
ConstantRange A(APInt(16, 3), APInt(16, 7));
ConstantRange B(APInt(16, 5), APInt(16, 9));
ConstantRange C(APInt(16, 3), APInt(16, 5));
ConstantRange D(APInt(16, 7), APInt(16, 9));
ConstantRange E(APInt(16, 5), APInt(16, 4));
ConstantRange F(APInt(16, 7), APInt(16, 3));
EXPECT_EQ(A.difference(B), C);
EXPECT_EQ(B.difference(A), D);
EXPECT_EQ(E.difference(A), F);
}
TEST_F(ConstantRangeTest, SubtractAPInt) {
EXPECT_EQ(Full.subtract(APInt(16, 4)), Full);
EXPECT_EQ(Empty.subtract(APInt(16, 4)), Empty);
EXPECT_EQ(Some.subtract(APInt(16, 4)),
ConstantRange(APInt(16, 0x6), APInt(16, 0xaa6)));
EXPECT_EQ(Wrap.subtract(APInt(16, 4)),
ConstantRange(APInt(16, 0xaa6), APInt(16, 0x6)));
EXPECT_EQ(One.subtract(APInt(16, 4)),
ConstantRange(APInt(16, 0x6)));
}
TEST_F(ConstantRangeTest, Add) {
EXPECT_EQ(Full.add(APInt(16, 4)), Full);
EXPECT_EQ(Full.add(Full), Full);
EXPECT_EQ(Full.add(Empty), Empty);
EXPECT_EQ(Full.add(One), Full);
EXPECT_EQ(Full.add(Some), Full);
EXPECT_EQ(Full.add(Wrap), Full);
EXPECT_EQ(Empty.add(Empty), Empty);
EXPECT_EQ(Empty.add(One), Empty);
EXPECT_EQ(Empty.add(Some), Empty);
EXPECT_EQ(Empty.add(Wrap), Empty);
EXPECT_EQ(Empty.add(APInt(16, 4)), Empty);
EXPECT_EQ(Some.add(APInt(16, 4)),
ConstantRange(APInt(16, 0xe), APInt(16, 0xaae)));
EXPECT_EQ(Wrap.add(APInt(16, 4)),
ConstantRange(APInt(16, 0xaae), APInt(16, 0xe)));
EXPECT_EQ(One.add(APInt(16, 4)),
ConstantRange(APInt(16, 0xe)));
}
TEST_F(ConstantRangeTest, AddWithNoSignedWrap) {
EXPECT_EQ(Empty.addWithNoSignedWrap(APInt(16, 1)), Empty);
EXPECT_EQ(Full.addWithNoSignedWrap(APInt(16, 1)),
ConstantRange(APInt(16, INT16_MIN+1), APInt(16, INT16_MIN)));
EXPECT_EQ(ConstantRange(APInt(8, -50), APInt(8, 50)).addWithNoSignedWrap(APInt(8, 10)),
ConstantRange(APInt(8, -40), APInt(8, 60)));
EXPECT_EQ(ConstantRange(APInt(8, -50), APInt(8, 120)).addWithNoSignedWrap(APInt(8, 10)),
ConstantRange(APInt(8, -40), APInt(8, INT8_MIN)));
EXPECT_EQ(ConstantRange(APInt(8, 120), APInt(8, -10)).addWithNoSignedWrap(APInt(8, 5)),
ConstantRange(APInt(8, 125), APInt(8, -5)));
EXPECT_EQ(ConstantRange(APInt(8, 120), APInt(8, -120)).addWithNoSignedWrap(APInt(8, 10)),
ConstantRange(APInt(8, INT8_MIN+10), APInt(8, -110)));
EXPECT_EQ(Empty.addWithNoSignedWrap(APInt(16, -1)), Empty);
EXPECT_EQ(Full.addWithNoSignedWrap(APInt(16, -1)),
ConstantRange(APInt(16, INT16_MIN), APInt(16, INT16_MAX)));
EXPECT_EQ(ConstantRange(APInt(8, -50), APInt(8, 50)).addWithNoSignedWrap(APInt(8, -10)),
ConstantRange(APInt(8, -60), APInt(8, 40)));
EXPECT_EQ(ConstantRange(APInt(8, -120), APInt(8, 50)).addWithNoSignedWrap(APInt(8, -10)),
ConstantRange(APInt(8, INT8_MIN), APInt(8, 40)));
EXPECT_EQ(ConstantRange(APInt(8, 120), APInt(8, -120)).addWithNoSignedWrap(APInt(8, -5)),
ConstantRange(APInt(8, 115), APInt(8, -125)));
EXPECT_EQ(ConstantRange(APInt(8, 120), APInt(8, -120)).addWithNoSignedWrap(APInt(8, -10)),
ConstantRange(APInt(8, 110), APInt(8, INT8_MIN-10)));
}
TEST_F(ConstantRangeTest, Sub) {
EXPECT_EQ(Full.sub(APInt(16, 4)), Full);
EXPECT_EQ(Full.sub(Full), Full);
EXPECT_EQ(Full.sub(Empty), Empty);
EXPECT_EQ(Full.sub(One), Full);
EXPECT_EQ(Full.sub(Some), Full);
EXPECT_EQ(Full.sub(Wrap), Full);
EXPECT_EQ(Empty.sub(Empty), Empty);
EXPECT_EQ(Empty.sub(One), Empty);
EXPECT_EQ(Empty.sub(Some), Empty);
EXPECT_EQ(Empty.sub(Wrap), Empty);
EXPECT_EQ(Empty.sub(APInt(16, 4)), Empty);
EXPECT_EQ(Some.sub(APInt(16, 4)),
ConstantRange(APInt(16, 0x6), APInt(16, 0xaa6)));
EXPECT_EQ(Some.sub(Some),
ConstantRange(APInt(16, 0xf561), APInt(16, 0xaa0)));
EXPECT_EQ(Wrap.sub(APInt(16, 4)),
ConstantRange(APInt(16, 0xaa6), APInt(16, 0x6)));
EXPECT_EQ(One.sub(APInt(16, 4)),
ConstantRange(APInt(16, 0x6)));
}
TEST_F(ConstantRangeTest, Multiply) {
EXPECT_EQ(Full.multiply(Full), Full);
EXPECT_EQ(Full.multiply(Empty), Empty);
EXPECT_EQ(Full.multiply(One), Full);
EXPECT_EQ(Full.multiply(Some), Full);
EXPECT_EQ(Full.multiply(Wrap), Full);
EXPECT_EQ(Empty.multiply(Empty), Empty);
EXPECT_EQ(Empty.multiply(One), Empty);
EXPECT_EQ(Empty.multiply(Some), Empty);
EXPECT_EQ(Empty.multiply(Wrap), Empty);
EXPECT_EQ(One.multiply(One), ConstantRange(APInt(16, 0xa*0xa),
APInt(16, 0xa*0xa + 1)));
EXPECT_EQ(One.multiply(Some), ConstantRange(APInt(16, 0xa*0xa),
APInt(16, 0xa*0xaa9 + 1)));
EXPECT_EQ(One.multiply(Wrap), Full);
EXPECT_EQ(Some.multiply(Some), Full);
EXPECT_EQ(Some.multiply(Wrap), Full);
EXPECT_EQ(Wrap.multiply(Wrap), Full);
ConstantRange Zero(APInt(16, 0));
EXPECT_EQ(Zero.multiply(Full), Zero);
EXPECT_EQ(Zero.multiply(Some), Zero);
EXPECT_EQ(Zero.multiply(Wrap), Zero);
EXPECT_EQ(Full.multiply(Zero), Zero);
EXPECT_EQ(Some.multiply(Zero), Zero);
EXPECT_EQ(Wrap.multiply(Zero), Zero);
// http://llvm.org/PR4545
EXPECT_EQ(ConstantRange(APInt(4, 1), APInt(4, 6)).multiply(
ConstantRange(APInt(4, 6), APInt(4, 2))),
ConstantRange(4, /*isFullSet=*/true));
EXPECT_EQ(ConstantRange(APInt(8, 254), APInt(8, 0)).multiply(
ConstantRange(APInt(8, 252), APInt(8, 4))),
ConstantRange(APInt(8, 250), APInt(8, 9)));
EXPECT_EQ(ConstantRange(APInt(8, 254), APInt(8, 255)).multiply(
ConstantRange(APInt(8, 2), APInt(8, 4))),
ConstantRange(APInt(8, 250), APInt(8, 253)));
// TODO: This should be return [-2, 0]
EXPECT_EQ(ConstantRange(APInt(8, -2)).multiply(
ConstantRange(APInt(8, 0), APInt(8, 2))),
ConstantRange(APInt(8, -2), APInt(8, 1)));
}
TEST_F(ConstantRangeTest, UMax) {
EXPECT_EQ(Full.umax(Full), Full);
EXPECT_EQ(Full.umax(Empty), Empty);
EXPECT_EQ(Full.umax(Some), ConstantRange(APInt(16, 0xa), APInt(16, 0)));
EXPECT_EQ(Full.umax(Wrap), Full);
EXPECT_EQ(Full.umax(Some), ConstantRange(APInt(16, 0xa), APInt(16, 0)));
EXPECT_EQ(Empty.umax(Empty), Empty);
EXPECT_EQ(Empty.umax(Some), Empty);
EXPECT_EQ(Empty.umax(Wrap), Empty);
EXPECT_EQ(Empty.umax(One), Empty);
EXPECT_EQ(Some.umax(Some), Some);
EXPECT_EQ(Some.umax(Wrap), ConstantRange(APInt(16, 0xa), APInt(16, 0)));
EXPECT_EQ(Some.umax(One), Some);
// TODO: ConstantRange is currently over-conservative here.
EXPECT_EQ(Wrap.umax(Wrap), Full);
EXPECT_EQ(Wrap.umax(One), ConstantRange(APInt(16, 0xa), APInt(16, 0)));
EXPECT_EQ(One.umax(One), One);
}
TEST_F(ConstantRangeTest, SMax) {
EXPECT_EQ(Full.smax(Full), Full);
EXPECT_EQ(Full.smax(Empty), Empty);
EXPECT_EQ(Full.smax(Some), ConstantRange(APInt(16, 0xa),
APInt::getSignedMinValue(16)));
EXPECT_EQ(Full.smax(Wrap), Full);
EXPECT_EQ(Full.smax(One), ConstantRange(APInt(16, 0xa),
APInt::getSignedMinValue(16)));
EXPECT_EQ(Empty.smax(Empty), Empty);
EXPECT_EQ(Empty.smax(Some), Empty);
EXPECT_EQ(Empty.smax(Wrap), Empty);
EXPECT_EQ(Empty.smax(One), Empty);
EXPECT_EQ(Some.smax(Some), Some);
EXPECT_EQ(Some.smax(Wrap), ConstantRange(APInt(16, 0xa),
APInt(16, (uint64_t)INT16_MIN)));
EXPECT_EQ(Some.smax(One), Some);
EXPECT_EQ(Wrap.smax(One), ConstantRange(APInt(16, 0xa),
APInt(16, (uint64_t)INT16_MIN)));
EXPECT_EQ(One.smax(One), One);
}
TEST_F(ConstantRangeTest, UMin) {
EXPECT_EQ(Full.umin(Full), Full);
EXPECT_EQ(Full.umin(Empty), Empty);
EXPECT_EQ(Full.umin(Some), ConstantRange(APInt(16, 0), APInt(16, 0xaaa)));
EXPECT_EQ(Full.umin(Wrap), Full);
EXPECT_EQ(Empty.umin(Empty), Empty);
EXPECT_EQ(Empty.umin(Some), Empty);
EXPECT_EQ(Empty.umin(Wrap), Empty);
EXPECT_EQ(Empty.umin(One), Empty);
EXPECT_EQ(Some.umin(Some), Some);
EXPECT_EQ(Some.umin(Wrap), ConstantRange(APInt(16, 0), APInt(16, 0xaaa)));
EXPECT_EQ(Some.umin(One), One);
// TODO: ConstantRange is currently over-conservative here.
EXPECT_EQ(Wrap.umin(Wrap), Full);
EXPECT_EQ(Wrap.umin(One), ConstantRange(APInt(16, 0), APInt(16, 0xb)));
EXPECT_EQ(One.umin(One), One);
}
TEST_F(ConstantRangeTest, SMin) {
EXPECT_EQ(Full.smin(Full), Full);
EXPECT_EQ(Full.smin(Empty), Empty);
EXPECT_EQ(Full.smin(Some), ConstantRange(APInt(16, (uint64_t)INT16_MIN),
APInt(16, 0xaaa)));
EXPECT_EQ(Full.smin(Wrap), Full);
EXPECT_EQ(Empty.smin(Empty), Empty);
EXPECT_EQ(Empty.smin(Some), Empty);
EXPECT_EQ(Empty.smin(Wrap), Empty);
EXPECT_EQ(Empty.smin(One), Empty);
EXPECT_EQ(Some.smin(Some), Some);
EXPECT_EQ(Some.smin(Wrap), ConstantRange(APInt(16, (uint64_t)INT16_MIN),
APInt(16, 0xaaa)));
EXPECT_EQ(Some.smin(One), One);
// TODO: ConstantRange is currently over-conservative here.
EXPECT_EQ(Wrap.smin(Wrap), Full);
EXPECT_EQ(Wrap.smin(One), ConstantRange(APInt(16, (uint64_t)INT16_MIN),
APInt(16, 0xb)));
EXPECT_EQ(One.smin(One), One);
}
TEST_F(ConstantRangeTest, UDiv) {
EXPECT_EQ(Full.udiv(Full), Full);
EXPECT_EQ(Full.udiv(Empty), Empty);
EXPECT_EQ(Full.udiv(One), ConstantRange(APInt(16, 0),
APInt(16, 0xffff / 0xa + 1)));
EXPECT_EQ(Full.udiv(Some), ConstantRange(APInt(16, 0),
APInt(16, 0xffff / 0xa + 1)));
EXPECT_EQ(Full.udiv(Wrap), Full);
EXPECT_EQ(Empty.udiv(Empty), Empty);
EXPECT_EQ(Empty.udiv(One), Empty);
EXPECT_EQ(Empty.udiv(Some), Empty);
EXPECT_EQ(Empty.udiv(Wrap), Empty);
EXPECT_EQ(One.udiv(One), ConstantRange(APInt(16, 1)));
EXPECT_EQ(One.udiv(Some), ConstantRange(APInt(16, 0), APInt(16, 2)));
EXPECT_EQ(One.udiv(Wrap), ConstantRange(APInt(16, 0), APInt(16, 0xb)));
EXPECT_EQ(Some.udiv(Some), ConstantRange(APInt(16, 0), APInt(16, 0x111)));
EXPECT_EQ(Some.udiv(Wrap), ConstantRange(APInt(16, 0), APInt(16, 0xaaa)));
EXPECT_EQ(Wrap.udiv(Wrap), Full);
}
TEST_F(ConstantRangeTest, Shl) {
EXPECT_EQ(Full.shl(Full), Full);
EXPECT_EQ(Full.shl(Empty), Empty);
EXPECT_EQ(Full.shl(One), Full); // TODO: [0, (-1 << 0xa) + 1)
EXPECT_EQ(Full.shl(Some), Full); // TODO: [0, (-1 << 0xa) + 1)
EXPECT_EQ(Full.shl(Wrap), Full);
EXPECT_EQ(Empty.shl(Empty), Empty);
EXPECT_EQ(Empty.shl(One), Empty);
EXPECT_EQ(Empty.shl(Some), Empty);
EXPECT_EQ(Empty.shl(Wrap), Empty);
EXPECT_EQ(One.shl(One), ConstantRange(APInt(16, 0xa << 0xa),
APInt(16, (0xa << 0xa) + 1)));
EXPECT_EQ(One.shl(Some), Full); // TODO: [0xa << 0xa, 0)
EXPECT_EQ(One.shl(Wrap), Full); // TODO: [0xa, 0xa << 14 + 1)
EXPECT_EQ(Some.shl(Some), Full); // TODO: [0xa << 0xa, 0xfc01)
EXPECT_EQ(Some.shl(Wrap), Full); // TODO: [0xa, 0x7ff << 0x5 + 1)
EXPECT_EQ(Wrap.shl(Wrap), Full);
}
TEST_F(ConstantRangeTest, Lshr) {
EXPECT_EQ(Full.lshr(Full), Full);
EXPECT_EQ(Full.lshr(Empty), Empty);
EXPECT_EQ(Full.lshr(One), ConstantRange(APInt(16, 0),
APInt(16, (0xffff >> 0xa) + 1)));
EXPECT_EQ(Full.lshr(Some), ConstantRange(APInt(16, 0),
APInt(16, (0xffff >> 0xa) + 1)));
EXPECT_EQ(Full.lshr(Wrap), Full);
EXPECT_EQ(Empty.lshr(Empty), Empty);
EXPECT_EQ(Empty.lshr(One), Empty);
EXPECT_EQ(Empty.lshr(Some), Empty);
EXPECT_EQ(Empty.lshr(Wrap), Empty);
EXPECT_EQ(One.lshr(One), ConstantRange(APInt(16, 0)));
EXPECT_EQ(One.lshr(Some), ConstantRange(APInt(16, 0)));
EXPECT_EQ(One.lshr(Wrap), ConstantRange(APInt(16, 0), APInt(16, 0xb)));
EXPECT_EQ(Some.lshr(Some), ConstantRange(APInt(16, 0),
APInt(16, (0xaaa >> 0xa) + 1)));
EXPECT_EQ(Some.lshr(Wrap), ConstantRange(APInt(16, 0), APInt(16, 0xaaa)));
EXPECT_EQ(Wrap.lshr(Wrap), Full);
}
TEST_F(ConstantRangeTest, Ashr) {
EXPECT_EQ(Full.ashr(Full), Full);
EXPECT_EQ(Full.ashr(Empty), Empty);
EXPECT_EQ(Full.ashr(One), ConstantRange(APInt(16, 0xffe0),
APInt(16, (0x7fff >> 0xa) + 1 )));
ConstantRange Small(APInt(16, 0xa), APInt(16, 0xb));
EXPECT_EQ(Full.ashr(Small), ConstantRange(APInt(16, 0xffe0),
APInt(16, (0x7fff >> 0xa) + 1 )));
EXPECT_EQ(Full.ashr(Some), ConstantRange(APInt(16, 0xffe0),
APInt(16, (0x7fff >> 0xa) + 1 )));
EXPECT_EQ(Full.ashr(Wrap), Full);
EXPECT_EQ(Empty.ashr(Empty), Empty);
EXPECT_EQ(Empty.ashr(One), Empty);
EXPECT_EQ(Empty.ashr(Some), Empty);
EXPECT_EQ(Empty.ashr(Wrap), Empty);
EXPECT_EQ(One.ashr(One), ConstantRange(APInt(16, 0)));
EXPECT_EQ(One.ashr(Some), ConstantRange(APInt(16, 0)));
EXPECT_EQ(One.ashr(Wrap), ConstantRange(APInt(16, 0), APInt(16, 0xb)));
EXPECT_EQ(Some.ashr(Some), ConstantRange(APInt(16, 0),
APInt(16, (0xaaa >> 0xa) + 1)));
EXPECT_EQ(Some.ashr(Wrap), ConstantRange(APInt(16, 0), APInt(16, 0xaaa)));
EXPECT_EQ(Wrap.ashr(Wrap), Full);
ConstantRange Neg(APInt(16, 0xf3f0, true), APInt(16, 0xf7f8, true));
EXPECT_EQ(Neg.ashr(Small), ConstantRange(APInt(16, 0xfffc, true),
APInt(16, 0xfffe, true)));
}
TEST(ConstantRange, MakeAllowedICmpRegion) {
// PR8250
ConstantRange SMax = ConstantRange(APInt::getSignedMaxValue(32));
EXPECT_TRUE(ConstantRange::makeAllowedICmpRegion(ICmpInst::ICMP_SGT, SMax)
.isEmptySet());
}
TEST(ConstantRange, MakeSatisfyingICmpRegion) {
ConstantRange LowHalf(APInt(8, 0), APInt(8, 128));
ConstantRange HighHalf(APInt(8, 128), APInt(8, 0));
ConstantRange EmptySet(8, /* isFullSet = */ false);
EXPECT_EQ(ConstantRange::makeSatisfyingICmpRegion(ICmpInst::ICMP_NE, LowHalf),
HighHalf);
EXPECT_EQ(
ConstantRange::makeSatisfyingICmpRegion(ICmpInst::ICMP_NE, HighHalf),
LowHalf);
EXPECT_TRUE(ConstantRange::makeSatisfyingICmpRegion(ICmpInst::ICMP_EQ,
HighHalf).isEmptySet());
ConstantRange UnsignedSample(APInt(8, 5), APInt(8, 200));
EXPECT_EQ(ConstantRange::makeSatisfyingICmpRegion(ICmpInst::ICMP_ULT,
UnsignedSample),
ConstantRange(APInt(8, 0), APInt(8, 5)));
EXPECT_EQ(ConstantRange::makeSatisfyingICmpRegion(ICmpInst::ICMP_ULE,
UnsignedSample),
ConstantRange(APInt(8, 0), APInt(8, 6)));
EXPECT_EQ(ConstantRange::makeSatisfyingICmpRegion(ICmpInst::ICMP_UGT,
UnsignedSample),
ConstantRange(APInt(8, 200), APInt(8, 0)));
EXPECT_EQ(ConstantRange::makeSatisfyingICmpRegion(ICmpInst::ICMP_UGE,
UnsignedSample),
ConstantRange(APInt(8, 199), APInt(8, 0)));
ConstantRange SignedSample(APInt(8, -5), APInt(8, 5));
EXPECT_EQ(
ConstantRange::makeSatisfyingICmpRegion(ICmpInst::ICMP_SLT, SignedSample),
ConstantRange(APInt(8, -128), APInt(8, -5)));
EXPECT_EQ(
ConstantRange::makeSatisfyingICmpRegion(ICmpInst::ICMP_SLE, SignedSample),
ConstantRange(APInt(8, -128), APInt(8, -4)));
EXPECT_EQ(
ConstantRange::makeSatisfyingICmpRegion(ICmpInst::ICMP_SGT, SignedSample),
ConstantRange(APInt(8, 5), APInt(8, -128)));
EXPECT_EQ(
ConstantRange::makeSatisfyingICmpRegion(ICmpInst::ICMP_SGE, SignedSample),
ConstantRange(APInt(8, 4), APInt(8, -128)));
}
TEST(ConstantRange, MakeGuaranteedNoWrapRegion) {
const int IntMin4Bits = 8;
const int IntMax4Bits = 7;
typedef OverflowingBinaryOperator OBO;
for (int Const : {0, -1, -2, 1, 2, IntMin4Bits, IntMax4Bits}) {
APInt C(4, Const, true /* = isSigned */);
auto NUWRegion = ConstantRange::makeGuaranteedNoWrapRegion(
Instruction::Add, C, OBO::NoUnsignedWrap);
EXPECT_FALSE(NUWRegion.isEmptySet());
auto NSWRegion = ConstantRange::makeGuaranteedNoWrapRegion(
Instruction::Add, C, OBO::NoSignedWrap);
EXPECT_FALSE(NSWRegion.isEmptySet());
auto NoWrapRegion = ConstantRange::makeGuaranteedNoWrapRegion(
Instruction::Add, C, OBO::NoSignedWrap | OBO::NoUnsignedWrap);
EXPECT_FALSE(NoWrapRegion.isEmptySet());
EXPECT_TRUE(NUWRegion.intersectWith(NSWRegion).contains(NoWrapRegion));
for (APInt I = NUWRegion.getLower(), E = NUWRegion.getUpper(); I != E;
++I) {
bool Overflow = false;
(void)I.uadd_ov(C, Overflow);
EXPECT_FALSE(Overflow);
}
for (APInt I = NSWRegion.getLower(), E = NSWRegion.getUpper(); I != E;
++I) {
bool Overflow = false;
(void)I.sadd_ov(C, Overflow);
EXPECT_FALSE(Overflow);
}
for (APInt I = NoWrapRegion.getLower(), E = NoWrapRegion.getUpper(); I != E;
++I) {
bool Overflow = false;
(void)I.sadd_ov(C, Overflow);
EXPECT_FALSE(Overflow);
(void)I.uadd_ov(C, Overflow);
EXPECT_FALSE(Overflow);
}
}
for (int Const : {0, -1, -2, 1, 2, IntMin4Bits, IntMax4Bits}) {
APInt C(4, Const, true /* = isSigned */);
auto NUWRegion = ConstantRange::makeGuaranteedNoWrapRegion(
Instruction::Sub, C, OBO::NoUnsignedWrap);
EXPECT_FALSE(NUWRegion.isEmptySet());
auto NSWRegion = ConstantRange::makeGuaranteedNoWrapRegion(
Instruction::Sub, C, OBO::NoSignedWrap);
EXPECT_FALSE(NSWRegion.isEmptySet());
auto NoWrapRegion = ConstantRange::makeGuaranteedNoWrapRegion(
Instruction::Sub, C, OBO::NoSignedWrap | OBO::NoUnsignedWrap);
EXPECT_FALSE(NoWrapRegion.isEmptySet());
EXPECT_TRUE(NUWRegion.intersectWith(NSWRegion).contains(NoWrapRegion));
for (APInt I = NUWRegion.getLower(), E = NUWRegion.getUpper(); I != E;
++I) {
bool Overflow = false;
(void)I.usub_ov(C, Overflow);
EXPECT_FALSE(Overflow);
}
for (APInt I = NSWRegion.getLower(), E = NSWRegion.getUpper(); I != E;
++I) {
bool Overflow = false;
(void)I.ssub_ov(C, Overflow);
EXPECT_FALSE(Overflow);
}
for (APInt I = NoWrapRegion.getLower(), E = NoWrapRegion.getUpper(); I != E;
++I) {
bool Overflow = false;
(void)I.ssub_ov(C, Overflow);
EXPECT_FALSE(Overflow);
(void)I.usub_ov(C, Overflow);
EXPECT_FALSE(Overflow);
}
}
auto NSWForAllValues = ConstantRange::makeGuaranteedNoWrapRegion(
Instruction::Add, ConstantRange(32, /* isFullSet = */ true),
OBO::NoSignedWrap);
EXPECT_TRUE(NSWForAllValues.isSingleElement() &&
NSWForAllValues.getSingleElement()->isMinValue());
NSWForAllValues = ConstantRange::makeGuaranteedNoWrapRegion(
Instruction::Sub, ConstantRange(32, /* isFullSet = */ true),
OBO::NoSignedWrap);
EXPECT_TRUE(NSWForAllValues.isSingleElement() &&
NSWForAllValues.getSingleElement()->isMaxValue());
auto NUWForAllValues = ConstantRange::makeGuaranteedNoWrapRegion(
Instruction::Add, ConstantRange(32, /* isFullSet = */ true),
OBO::NoUnsignedWrap);
EXPECT_TRUE(NUWForAllValues.isSingleElement() &&
NUWForAllValues.getSingleElement()->isMinValue());
NUWForAllValues = ConstantRange::makeGuaranteedNoWrapRegion(
Instruction::Sub, ConstantRange(32, /* isFullSet = */ true),
OBO::NoUnsignedWrap);
EXPECT_TRUE(NUWForAllValues.isSingleElement() &&
NUWForAllValues.getSingleElement()->isMaxValue());
auto NUWAndNSWForAllValues = ConstantRange::makeGuaranteedNoWrapRegion(
Instruction::Add, ConstantRange(32, /* isFullSet = */ true),
OBO::NoUnsignedWrap | OBO::NoSignedWrap);
EXPECT_TRUE(NUWAndNSWForAllValues.isSingleElement() &&
NUWAndNSWForAllValues.getSingleElement()->isMinValue());
NUWAndNSWForAllValues = ConstantRange::makeGuaranteedNoWrapRegion(
Instruction::Sub, ConstantRange(32, /* isFullSet = */ true),
OBO::NoUnsignedWrap | OBO::NoSignedWrap);
EXPECT_TRUE(NUWAndNSWForAllValues.isSingleElement() &&
NUWAndNSWForAllValues.getSingleElement()->isMaxValue());
EXPECT_TRUE(ConstantRange::makeGuaranteedNoWrapRegion(
Instruction::Add, APInt(32, 0), OBO::NoUnsignedWrap).isFullSet());
EXPECT_TRUE(ConstantRange::makeGuaranteedNoWrapRegion(
Instruction::Add, APInt(32, 0), OBO::NoSignedWrap).isFullSet());
EXPECT_TRUE(ConstantRange::makeGuaranteedNoWrapRegion(
Instruction::Add, APInt(32, 0),
OBO::NoUnsignedWrap | OBO::NoSignedWrap).isFullSet());
EXPECT_TRUE(ConstantRange::makeGuaranteedNoWrapRegion(
Instruction::Sub, APInt(32, 0), OBO::NoUnsignedWrap).isFullSet());
EXPECT_TRUE(ConstantRange::makeGuaranteedNoWrapRegion(
Instruction::Sub, APInt(32, 0), OBO::NoSignedWrap).isFullSet());
EXPECT_TRUE(ConstantRange::makeGuaranteedNoWrapRegion(
Instruction::Sub, APInt(32, 0),
OBO::NoUnsignedWrap | OBO::NoSignedWrap).isFullSet());
ConstantRange OneToFive(APInt(32, 1), APInt(32, 6));
EXPECT_EQ(ConstantRange::makeGuaranteedNoWrapRegion(
Instruction::Add, OneToFive, OBO::NoSignedWrap),
ConstantRange(APInt::getSignedMinValue(32),
APInt::getSignedMaxValue(32) - 4));
EXPECT_EQ(ConstantRange::makeGuaranteedNoWrapRegion(
Instruction::Add, OneToFive, OBO::NoUnsignedWrap),
ConstantRange(APInt::getMinValue(32), APInt::getMinValue(32) - 5));
EXPECT_EQ(
ConstantRange::makeGuaranteedNoWrapRegion(
Instruction::Add, OneToFive, OBO::NoUnsignedWrap | OBO::NoSignedWrap),
ConstantRange(APInt::getMinValue(32), APInt::getSignedMaxValue(32) - 4));
EXPECT_EQ(ConstantRange::makeGuaranteedNoWrapRegion(
Instruction::Sub, OneToFive, OBO::NoSignedWrap),
ConstantRange(APInt::getSignedMinValue(32) + 5,
APInt::getSignedMinValue(32)));
EXPECT_EQ(ConstantRange::makeGuaranteedNoWrapRegion(
Instruction::Sub, OneToFive, OBO::NoUnsignedWrap),
ConstantRange(APInt::getMinValue(32) + 5, APInt::getMinValue(32)));
EXPECT_EQ(
ConstantRange::makeGuaranteedNoWrapRegion(
Instruction::Sub, OneToFive, OBO::NoUnsignedWrap | OBO::NoSignedWrap),
ConstantRange(APInt::getMinValue(32) + 5, APInt::getSignedMinValue(32)));
ConstantRange MinusFiveToMinusTwo(APInt(32, -5), APInt(32, -1));
EXPECT_EQ(ConstantRange::makeGuaranteedNoWrapRegion(
Instruction::Add, MinusFiveToMinusTwo, OBO::NoSignedWrap),
ConstantRange(APInt::getSignedMinValue(32) + 5,
APInt::getSignedMinValue(32)));
EXPECT_EQ(ConstantRange::makeGuaranteedNoWrapRegion(
Instruction::Add, MinusFiveToMinusTwo, OBO::NoUnsignedWrap),
ConstantRange(APInt(32, 0), APInt(32, 2)));
EXPECT_EQ(ConstantRange::makeGuaranteedNoWrapRegion(
Instruction::Add, MinusFiveToMinusTwo,
OBO::NoUnsignedWrap | OBO::NoSignedWrap),
ConstantRange(APInt(32, 0), APInt(32, 2)));
EXPECT_EQ(ConstantRange::makeGuaranteedNoWrapRegion(
Instruction::Sub, MinusFiveToMinusTwo, OBO::NoSignedWrap),
ConstantRange(APInt::getSignedMinValue(32),
APInt::getSignedMaxValue(32) - 4));
EXPECT_EQ(ConstantRange::makeGuaranteedNoWrapRegion(
Instruction::Sub, MinusFiveToMinusTwo, OBO::NoUnsignedWrap),
ConstantRange(APInt::getMaxValue(32) - 1,
APInt::getMinValue(32)));
EXPECT_EQ(ConstantRange::makeGuaranteedNoWrapRegion(
Instruction::Sub, MinusFiveToMinusTwo,
OBO::NoUnsignedWrap | OBO::NoSignedWrap),
ConstantRange(APInt::getMaxValue(32) - 1,
APInt::getMinValue(32)));
ConstantRange MinusOneToOne(APInt(32, -1), APInt(32, 2));
EXPECT_EQ(ConstantRange::makeGuaranteedNoWrapRegion(
Instruction::Add, MinusOneToOne, OBO::NoSignedWrap),
ConstantRange(APInt::getSignedMinValue(32) + 1,
APInt::getSignedMinValue(32) - 1));
EXPECT_EQ(ConstantRange::makeGuaranteedNoWrapRegion(
Instruction::Add, MinusOneToOne, OBO::NoUnsignedWrap),
ConstantRange(APInt(32, 0), APInt(32, 1)));
EXPECT_EQ(ConstantRange::makeGuaranteedNoWrapRegion(
Instruction::Add, MinusOneToOne,
OBO::NoUnsignedWrap | OBO::NoSignedWrap),
ConstantRange(APInt(32, 0), APInt(32, 1)));
EXPECT_EQ(ConstantRange::makeGuaranteedNoWrapRegion(
Instruction::Sub, MinusOneToOne, OBO::NoSignedWrap),
ConstantRange(APInt::getSignedMinValue(32) + 1,
APInt::getSignedMinValue(32) - 1));
EXPECT_EQ(ConstantRange::makeGuaranteedNoWrapRegion(
Instruction::Sub, MinusOneToOne, OBO::NoUnsignedWrap),
ConstantRange(APInt::getMaxValue(32),
APInt::getMinValue(32)));
EXPECT_EQ(ConstantRange::makeGuaranteedNoWrapRegion(
Instruction::Sub, MinusOneToOne,
OBO::NoUnsignedWrap | OBO::NoSignedWrap),
ConstantRange(APInt::getMaxValue(32),
APInt::getMinValue(32)));
ConstantRange One(APInt(32, 1), APInt(32, 2));
EXPECT_EQ(ConstantRange::makeGuaranteedNoWrapRegion(
Instruction::Add, One, OBO::NoSignedWrap),
ConstantRange(APInt::getSignedMinValue(32),
APInt::getSignedMaxValue(32)));
EXPECT_EQ(ConstantRange::makeGuaranteedNoWrapRegion(
Instruction::Add, One, OBO::NoUnsignedWrap),
ConstantRange(APInt::getMinValue(32), APInt::getMaxValue(32)));
EXPECT_EQ(
ConstantRange::makeGuaranteedNoWrapRegion(
Instruction::Add, One, OBO::NoUnsignedWrap | OBO::NoSignedWrap),
ConstantRange(APInt(32, 0), APInt::getSignedMaxValue(32)));
EXPECT_EQ(ConstantRange::makeGuaranteedNoWrapRegion(
Instruction::Sub, One, OBO::NoSignedWrap),
ConstantRange(APInt::getSignedMinValue(32) + 1,
APInt::getSignedMinValue(32)));
EXPECT_EQ(ConstantRange::makeGuaranteedNoWrapRegion(
Instruction::Sub, One, OBO::NoUnsignedWrap),
ConstantRange(APInt::getMinValue(32) + 1, APInt::getMinValue(32)));
EXPECT_EQ(
ConstantRange::makeGuaranteedNoWrapRegion(
Instruction::Sub, One, OBO::NoUnsignedWrap | OBO::NoSignedWrap),
ConstantRange(APInt::getMinValue(32) + 1, APInt::getSignedMinValue(32)));
}
TEST(ConstantRange, GetEquivalentICmp) {
APInt RHS;
CmpInst::Predicate Pred;
EXPECT_TRUE(ConstantRange(APInt::getMinValue(32), APInt(32, 100))
.getEquivalentICmp(Pred, RHS));
EXPECT_EQ(Pred, CmpInst::ICMP_ULT);
EXPECT_EQ(RHS, APInt(32, 100));
EXPECT_TRUE(ConstantRange(APInt::getSignedMinValue(32), APInt(32, 100))
.getEquivalentICmp(Pred, RHS));
EXPECT_EQ(Pred, CmpInst::ICMP_SLT);
EXPECT_EQ(RHS, APInt(32, 100));
EXPECT_TRUE(ConstantRange(APInt(32, 100), APInt::getMinValue(32))
.getEquivalentICmp(Pred, RHS));
EXPECT_EQ(Pred, CmpInst::ICMP_UGE);
EXPECT_EQ(RHS, APInt(32, 100));
EXPECT_TRUE(ConstantRange(APInt(32, 100), APInt::getSignedMinValue(32))
.getEquivalentICmp(Pred, RHS));
EXPECT_EQ(Pred, CmpInst::ICMP_SGE);
EXPECT_EQ(RHS, APInt(32, 100));
EXPECT_TRUE(
ConstantRange(32, /*isFullSet=*/true).getEquivalentICmp(Pred, RHS));
EXPECT_EQ(Pred, CmpInst::ICMP_UGE);
EXPECT_EQ(RHS, APInt(32, 0));
EXPECT_TRUE(
ConstantRange(32, /*isFullSet=*/false).getEquivalentICmp(Pred, RHS));
EXPECT_EQ(Pred, CmpInst::ICMP_ULT);
EXPECT_EQ(RHS, APInt(32, 0));
EXPECT_FALSE(ConstantRange(APInt(32, 100), APInt(32, 200))
.getEquivalentICmp(Pred, RHS));
EXPECT_FALSE(ConstantRange(APInt::getSignedMinValue(32) - APInt(32, 100),
APInt::getSignedMinValue(32) + APInt(32, 100))
.getEquivalentICmp(Pred, RHS));
EXPECT_FALSE(ConstantRange(APInt::getMinValue(32) - APInt(32, 100),
APInt::getMinValue(32) + APInt(32, 100))
.getEquivalentICmp(Pred, RHS));
EXPECT_TRUE(ConstantRange(APInt(32, 100)).getEquivalentICmp(Pred, RHS));
EXPECT_EQ(Pred, CmpInst::ICMP_EQ);
EXPECT_EQ(RHS, APInt(32, 100));
EXPECT_TRUE(
ConstantRange(APInt(32, 100)).inverse().getEquivalentICmp(Pred, RHS));
EXPECT_EQ(Pred, CmpInst::ICMP_NE);
EXPECT_EQ(RHS, APInt(32, 100));
EXPECT_TRUE(
ConstantRange(APInt(512, 100)).inverse().getEquivalentICmp(Pred, RHS));
EXPECT_EQ(Pred, CmpInst::ICMP_NE);
EXPECT_EQ(RHS, APInt(512, 100));
// NB! It would be correct for the following four calls to getEquivalentICmp
// to return ordered predicates like CmpInst::ICMP_ULT or CmpInst::ICMP_UGT.
// However, that's not the case today.
EXPECT_TRUE(ConstantRange(APInt(32, 0)).getEquivalentICmp(Pred, RHS));
EXPECT_EQ(Pred, CmpInst::ICMP_EQ);
EXPECT_EQ(RHS, APInt(32, 0));
EXPECT_TRUE(
ConstantRange(APInt(32, 0)).inverse().getEquivalentICmp(Pred, RHS));
EXPECT_EQ(Pred, CmpInst::ICMP_NE);
EXPECT_EQ(RHS, APInt(32, 0));
EXPECT_TRUE(ConstantRange(APInt(32, -1)).getEquivalentICmp(Pred, RHS));
EXPECT_EQ(Pred, CmpInst::ICMP_EQ);
EXPECT_EQ(RHS, APInt(32, -1));
EXPECT_TRUE(
ConstantRange(APInt(32, -1)).inverse().getEquivalentICmp(Pred, RHS));
EXPECT_EQ(Pred, CmpInst::ICMP_NE);
EXPECT_EQ(RHS, APInt(32, -1));
}
TEST(ConstantRange, MakeGuaranteedNoWrapRegionMulUnsignedSingleValue) {
typedef OverflowingBinaryOperator OBO;
for (uint64_t I = std::numeric_limits<uint8_t>::min();
I <= std::numeric_limits<uint8_t>::max(); I++) {
auto Range = ConstantRange::makeGuaranteedNoWrapRegion(
Instruction::Mul, ConstantRange(APInt(8, I), APInt(8, I + 1)),
OBO::NoUnsignedWrap);
for (uint64_t V = std::numeric_limits<uint8_t>::min();
V <= std::numeric_limits<uint8_t>::max(); V++) {
bool Overflow;
(void)APInt(8, I).umul_ov(APInt(8, V), Overflow);
EXPECT_EQ(!Overflow, Range.contains(APInt(8, V)));
}
}
}
TEST(ConstantRange, MakeGuaranteedNoWrapRegionMulSignedSingleValue) {
typedef OverflowingBinaryOperator OBO;
for (int64_t I = std::numeric_limits<int8_t>::min();
I <= std::numeric_limits<int8_t>::max(); I++) {
auto Range = ConstantRange::makeGuaranteedNoWrapRegion(
Instruction::Mul,
ConstantRange(APInt(8, I, /*isSigned=*/true),
APInt(8, I + 1, /*isSigned=*/true)),
OBO::NoSignedWrap);
for (int64_t V = std::numeric_limits<int8_t>::min();
V <= std::numeric_limits<int8_t>::max(); V++) {
bool Overflow;
(void)APInt(8, I, /*isSigned=*/true)
.smul_ov(APInt(8, V, /*isSigned=*/true), Overflow);
EXPECT_EQ(!Overflow, Range.contains(APInt(8, V, /*isSigned=*/true)));
}
}
}
TEST(ConstantRange, MakeGuaranteedNoWrapRegionMulUnsignedAndSignedSingleValue) {
typedef OverflowingBinaryOperator OBO;
for (uint64_t I = std::numeric_limits<uint8_t>::min();
I <= std::numeric_limits<uint8_t>::max(); I++) {
auto Range = ConstantRange::makeGuaranteedNoWrapRegion(
Instruction::Mul, ConstantRange(APInt(8, I), APInt(8, I + 1)),
OBO::NoUnsignedWrap | OBO::NoSignedWrap);
for (uint64_t V = std::numeric_limits<uint8_t>::min();
V <= std::numeric_limits<uint8_t>::max(); V++) {
bool UOverflow;
(void)APInt(8, I).umul_ov(APInt(8, V), UOverflow);
bool SOverflow;
(void)APInt(8, I).smul_ov(APInt(8, V), SOverflow);
EXPECT_EQ(!(UOverflow || SOverflow), Range.contains(APInt(8, V)));
}
}
}
TEST(ConstantRange, MakeGuaranteedNoWrapRegionMulUnsignedRange) {
typedef OverflowingBinaryOperator OBO;
for (uint64_t Lo = std::numeric_limits<uint8_t>::min();
Lo <= std::numeric_limits<uint8_t>::max(); Lo++) {
for (uint64_t Hi = Lo; Hi <= std::numeric_limits<uint8_t>::max(); Hi++) {
EXPECT_EQ(
ConstantRange::makeGuaranteedNoWrapRegion(
Instruction::Mul, ConstantRange(APInt(8, Lo), APInt(8, Hi + 1)),
OBO::NoUnsignedWrap),
ConstantRange::makeGuaranteedNoWrapRegion(
Instruction::Mul, ConstantRange(APInt(8, Hi), APInt(8, Hi + 1)),
OBO::NoUnsignedWrap));
}
}
}
TEST(ConstantRange, MakeGuaranteedNoWrapRegionMulSignedRange) {
typedef OverflowingBinaryOperator OBO;
int Lo = -12, Hi = 16;
auto Range = ConstantRange::makeGuaranteedNoWrapRegion(
Instruction::Mul,
ConstantRange(APInt(8, Lo, /*isSigned=*/true),
APInt(8, Hi + 1, /*isSigned=*/true)),
OBO::NoSignedWrap);
for (int64_t V = std::numeric_limits<int8_t>::min();
V <= std::numeric_limits<int8_t>::max(); V++) {
bool AnyOverflow = false;
for (int64_t I = Lo; I <= Hi; I++) {
bool Overflow;
(void)APInt(8, I, /*isSigned=*/true)
.smul_ov(APInt(8, V, /*isSigned=*/true), Overflow);
AnyOverflow |= Overflow;
}
EXPECT_EQ(!AnyOverflow, Range.contains(APInt(8, V, /*isSigned=*/true)));
}
}
#define EXPECT_MAY_OVERFLOW(op) \
EXPECT_EQ(ConstantRange::OverflowResult::MayOverflow, (op))
#define EXPECT_ALWAYS_OVERFLOWS(op) \
EXPECT_EQ(ConstantRange::OverflowResult::AlwaysOverflows, (op))
#define EXPECT_NEVER_OVERFLOWS(op) \
EXPECT_EQ(ConstantRange::OverflowResult::NeverOverflows, (op))
TEST_F(ConstantRangeTest, UnsignedAddOverflow) {
// Ill-defined - may overflow is a conservative result.
EXPECT_MAY_OVERFLOW(Some.unsignedAddMayOverflow(Empty));
EXPECT_MAY_OVERFLOW(Empty.unsignedAddMayOverflow(Some));
// Never overflow despite one full/wrap set.
ConstantRange Zero(APInt::getNullValue(16));
EXPECT_NEVER_OVERFLOWS(Full.unsignedAddMayOverflow(Zero));
EXPECT_NEVER_OVERFLOWS(Wrap.unsignedAddMayOverflow(Zero));
EXPECT_NEVER_OVERFLOWS(Zero.unsignedAddMayOverflow(Full));
EXPECT_NEVER_OVERFLOWS(Zero.unsignedAddMayOverflow(Wrap));
// But usually full/wrap always may overflow.
EXPECT_MAY_OVERFLOW(Full.unsignedAddMayOverflow(One));
EXPECT_MAY_OVERFLOW(Wrap.unsignedAddMayOverflow(One));
EXPECT_MAY_OVERFLOW(One.unsignedAddMayOverflow(Full));
EXPECT_MAY_OVERFLOW(One.unsignedAddMayOverflow(Wrap));
ConstantRange A(APInt(16, 0xfd00), APInt(16, 0xfe00));
ConstantRange B1(APInt(16, 0x0100), APInt(16, 0x0201));
ConstantRange B2(APInt(16, 0x0100), APInt(16, 0x0202));
EXPECT_NEVER_OVERFLOWS(A.unsignedAddMayOverflow(B1));
EXPECT_MAY_OVERFLOW(A.unsignedAddMayOverflow(B2));
EXPECT_NEVER_OVERFLOWS(B1.unsignedAddMayOverflow(A));
EXPECT_MAY_OVERFLOW(B2.unsignedAddMayOverflow(A));
ConstantRange C1(APInt(16, 0x0299), APInt(16, 0x0400));
ConstantRange C2(APInt(16, 0x0300), APInt(16, 0x0400));
EXPECT_MAY_OVERFLOW(A.unsignedAddMayOverflow(C1));
EXPECT_ALWAYS_OVERFLOWS(A.unsignedAddMayOverflow(C2));
EXPECT_MAY_OVERFLOW(C1.unsignedAddMayOverflow(A));
EXPECT_ALWAYS_OVERFLOWS(C2.unsignedAddMayOverflow(A));
}
TEST_F(ConstantRangeTest, UnsignedSubOverflow) {
// Ill-defined - may overflow is a conservative result.
EXPECT_MAY_OVERFLOW(Some.unsignedSubMayOverflow(Empty));
EXPECT_MAY_OVERFLOW(Empty.unsignedSubMayOverflow(Some));
// Never overflow despite one full/wrap set.
ConstantRange Zero(APInt::getNullValue(16));
ConstantRange Max(APInt::getAllOnesValue(16));
EXPECT_NEVER_OVERFLOWS(Full.unsignedSubMayOverflow(Zero));
EXPECT_NEVER_OVERFLOWS(Wrap.unsignedSubMayOverflow(Zero));
EXPECT_NEVER_OVERFLOWS(Max.unsignedSubMayOverflow(Full));
EXPECT_NEVER_OVERFLOWS(Max.unsignedSubMayOverflow(Wrap));
// But usually full/wrap always may overflow.
EXPECT_MAY_OVERFLOW(Full.unsignedSubMayOverflow(One));
EXPECT_MAY_OVERFLOW(Wrap.unsignedSubMayOverflow(One));
EXPECT_MAY_OVERFLOW(One.unsignedSubMayOverflow(Full));
EXPECT_MAY_OVERFLOW(One.unsignedSubMayOverflow(Wrap));
ConstantRange A(APInt(16, 0x0000), APInt(16, 0x0100));
ConstantRange B(APInt(16, 0x0100), APInt(16, 0x0200));
EXPECT_NEVER_OVERFLOWS(B.unsignedSubMayOverflow(A));
EXPECT_ALWAYS_OVERFLOWS(A.unsignedSubMayOverflow(B));
ConstantRange A1(APInt(16, 0x0000), APInt(16, 0x0101));
ConstantRange B1(APInt(16, 0x0100), APInt(16, 0x0201));
EXPECT_NEVER_OVERFLOWS(B1.unsignedSubMayOverflow(A1));
EXPECT_MAY_OVERFLOW(A1.unsignedSubMayOverflow(B1));
ConstantRange A2(APInt(16, 0x0000), APInt(16, 0x0102));
ConstantRange B2(APInt(16, 0x0100), APInt(16, 0x0202));
EXPECT_MAY_OVERFLOW(B2.unsignedSubMayOverflow(A2));
EXPECT_MAY_OVERFLOW(A2.unsignedSubMayOverflow(B2));
}
TEST_F(ConstantRangeTest, SignedAddOverflow) {
// Ill-defined - may overflow is a conservative result.
EXPECT_MAY_OVERFLOW(Some.signedAddMayOverflow(Empty));
EXPECT_MAY_OVERFLOW(Empty.signedAddMayOverflow(Some));
// Never overflow despite one full/wrap set.
ConstantRange Zero(APInt::getNullValue(16));
EXPECT_NEVER_OVERFLOWS(Full.signedAddMayOverflow(Zero));
EXPECT_NEVER_OVERFLOWS(Wrap.signedAddMayOverflow(Zero));
EXPECT_NEVER_OVERFLOWS(Zero.signedAddMayOverflow(Full));
EXPECT_NEVER_OVERFLOWS(Zero.signedAddMayOverflow(Wrap));
// But usually full/wrap always may overflow.
EXPECT_MAY_OVERFLOW(Full.signedAddMayOverflow(One));
EXPECT_MAY_OVERFLOW(Wrap.signedAddMayOverflow(One));
EXPECT_MAY_OVERFLOW(One.signedAddMayOverflow(Full));
EXPECT_MAY_OVERFLOW(One.signedAddMayOverflow(Wrap));
ConstantRange A(APInt(16, 0x7d00), APInt(16, 0x7e00));
ConstantRange B1(APInt(16, 0x0100), APInt(16, 0x0201));
ConstantRange B2(APInt(16, 0x0100), APInt(16, 0x0202));
EXPECT_NEVER_OVERFLOWS(A.signedAddMayOverflow(B1));
EXPECT_MAY_OVERFLOW(A.signedAddMayOverflow(B2));
ConstantRange B3(APInt(16, 0x8000), APInt(16, 0x0201));
ConstantRange B4(APInt(16, 0x8000), APInt(16, 0x0202));
EXPECT_NEVER_OVERFLOWS(A.signedAddMayOverflow(B3));
EXPECT_MAY_OVERFLOW(A.signedAddMayOverflow(B4));
ConstantRange B5(APInt(16, 0x0299), APInt(16, 0x0400));
ConstantRange B6(APInt(16, 0x0300), APInt(16, 0x0400));
EXPECT_MAY_OVERFLOW(A.signedAddMayOverflow(B5));
EXPECT_ALWAYS_OVERFLOWS(A.signedAddMayOverflow(B6));
ConstantRange C(APInt(16, 0x8200), APInt(16, 0x8300));
ConstantRange D1(APInt(16, 0xfe00), APInt(16, 0xff00));
ConstantRange D2(APInt(16, 0xfd99), APInt(16, 0xff00));
EXPECT_NEVER_OVERFLOWS(C.signedAddMayOverflow(D1));
EXPECT_MAY_OVERFLOW(C.signedAddMayOverflow(D2));
ConstantRange D3(APInt(16, 0xfe00), APInt(16, 0x8000));
ConstantRange D4(APInt(16, 0xfd99), APInt(16, 0x8000));
EXPECT_NEVER_OVERFLOWS(C.signedAddMayOverflow(D3));
EXPECT_MAY_OVERFLOW(C.signedAddMayOverflow(D4));
ConstantRange D5(APInt(16, 0xfc00), APInt(16, 0xfd02));
ConstantRange D6(APInt(16, 0xfc00), APInt(16, 0xfd01));
EXPECT_MAY_OVERFLOW(C.signedAddMayOverflow(D5));
EXPECT_ALWAYS_OVERFLOWS(C.signedAddMayOverflow(D6));
ConstantRange E(APInt(16, 0xff00), APInt(16, 0x0100));
EXPECT_NEVER_OVERFLOWS(E.signedAddMayOverflow(E));
ConstantRange F(APInt(16, 0xf000), APInt(16, 0x7000));
EXPECT_MAY_OVERFLOW(F.signedAddMayOverflow(F));
}
TEST_F(ConstantRangeTest, SignedSubOverflow) {
// Ill-defined - may overflow is a conservative result.
EXPECT_MAY_OVERFLOW(Some.signedSubMayOverflow(Empty));
EXPECT_MAY_OVERFLOW(Empty.signedSubMayOverflow(Some));
// Never overflow despite one full/wrap set.
ConstantRange Zero(APInt::getNullValue(16));
EXPECT_NEVER_OVERFLOWS(Full.signedSubMayOverflow(Zero));
EXPECT_NEVER_OVERFLOWS(Wrap.signedSubMayOverflow(Zero));
// But usually full/wrap always may overflow.
EXPECT_MAY_OVERFLOW(Full.signedSubMayOverflow(One));
EXPECT_MAY_OVERFLOW(Wrap.signedSubMayOverflow(One));
EXPECT_MAY_OVERFLOW(One.signedSubMayOverflow(Full));
EXPECT_MAY_OVERFLOW(One.signedSubMayOverflow(Wrap));
ConstantRange A(APInt(16, 0x7d00), APInt(16, 0x7e00));
ConstantRange B1(APInt(16, 0xfe00), APInt(16, 0xff00));
ConstantRange B2(APInt(16, 0xfd99), APInt(16, 0xff00));
EXPECT_NEVER_OVERFLOWS(A.signedSubMayOverflow(B1));
EXPECT_MAY_OVERFLOW(A.signedSubMayOverflow(B2));
ConstantRange B3(APInt(16, 0xfc00), APInt(16, 0xfd02));
ConstantRange B4(APInt(16, 0xfc00), APInt(16, 0xfd01));
EXPECT_MAY_OVERFLOW(A.signedSubMayOverflow(B3));
EXPECT_ALWAYS_OVERFLOWS(A.signedSubMayOverflow(B4));
ConstantRange C(APInt(16, 0x8200), APInt(16, 0x8300));
ConstantRange D1(APInt(16, 0x0100), APInt(16, 0x0201));
ConstantRange D2(APInt(16, 0x0100), APInt(16, 0x0202));
EXPECT_NEVER_OVERFLOWS(C.signedSubMayOverflow(D1));
EXPECT_MAY_OVERFLOW(C.signedSubMayOverflow(D2));
ConstantRange D3(APInt(16, 0x0299), APInt(16, 0x0400));
ConstantRange D4(APInt(16, 0x0300), APInt(16, 0x0400));
EXPECT_MAY_OVERFLOW(C.signedSubMayOverflow(D3));
EXPECT_ALWAYS_OVERFLOWS(C.signedSubMayOverflow(D4));
ConstantRange E(APInt(16, 0xff00), APInt(16, 0x0100));
EXPECT_NEVER_OVERFLOWS(E.signedSubMayOverflow(E));
ConstantRange F(APInt(16, 0xf000), APInt(16, 0x7001));
EXPECT_MAY_OVERFLOW(F.signedSubMayOverflow(F));
}
template<typename Fn1, typename Fn2>
static void TestOverflowExhaustive(Fn1 OverflowFn, Fn2 MayOverflowFn) {
// Constant range overflow checks are tested exhaustively on 4-bit numbers.
unsigned Bits = 4;
unsigned Max = 1 << Bits;
for (unsigned Lo1 = 0; Lo1 < Max; Lo1++) {
for (unsigned Hi1 = 0; Hi1 < Max; Hi1++) {
// Enforce ConstantRange invariant.
if (Lo1 == Hi1 && Lo1 != 0 && Lo1 != Max - 1)
continue;
ConstantRange CR1(APInt(Bits, Lo1), APInt(Bits, Hi1));
unsigned Size1 = CR1.getSetSize().getLimitedValue();
for (unsigned Lo2 = 0; Lo2 < Max; Lo2++) {
for (unsigned Hi2 = 0; Hi2 < Max; Hi2++) {
// Enforce ConstantRange invariant.
if (Lo2 == Hi2 && Lo2 != 0 && Lo2 != Max - 1)
continue;
ConstantRange CR2(APInt(Bits, Lo2), APInt(Bits, Hi2));
unsigned Size2 = CR2.getSetSize().getLimitedValue();
// Loop over all N1 in CR1 and N2 in CR2 and check whether any of the
// operations have overflow / have no overflow. These loops are based
// on Size1/Size2 to properly handle empty/full ranges.
bool RangeHasOverflow = false;
bool RangeHasNoOverflow = false;
APInt N1(Bits, Lo1);
for (unsigned I1 = 0; I1 < Size1; I1++, N1++) {
APInt N2(Bits, Lo2);
for (unsigned I2 = 0; I2 < Size2; I2++, N2++) {
assert(CR1.contains(N1));
assert(CR2.contains(N2));
if (OverflowFn(N1, N2))
RangeHasOverflow = true;
else
RangeHasNoOverflow = true;
}
}
ConstantRange::OverflowResult OR = MayOverflowFn(CR1, CR2);
switch (OR) {
case ConstantRange::OverflowResult::AlwaysOverflows:
EXPECT_TRUE(RangeHasOverflow);
EXPECT_FALSE(RangeHasNoOverflow);
break;
case ConstantRange::OverflowResult::NeverOverflows:
EXPECT_FALSE(RangeHasOverflow);
EXPECT_TRUE(RangeHasNoOverflow);
break;
case ConstantRange::OverflowResult::MayOverflow:
// We return MayOverflow for empty sets as a conservative result,
// but of course neither the RangeHasOverflow nor the
// RangeHasNoOverflow flags will be set.
if (CR1.isEmptySet() || CR2.isEmptySet())
break;
EXPECT_TRUE(RangeHasOverflow);
EXPECT_TRUE(RangeHasNoOverflow);
break;
default:
llvm_unreachable("Invalid enum return value");
}
}
}
}
}
}
TEST_F(ConstantRangeTest, UnsignedAddOverflowExhautive) {
TestOverflowExhaustive(
[](const APInt &N1, const APInt &N2) {
bool Overflow;
N1.uadd_ov(N2, Overflow);
return Overflow;
},
[](const ConstantRange &CR1, const ConstantRange &CR2) {
return CR1.unsignedAddMayOverflow(CR2);
});
}
TEST_F(ConstantRangeTest, UnsignedSubOverflowExhautive) {
TestOverflowExhaustive(
[](const APInt &N1, const APInt &N2) {
bool Overflow;
N1.usub_ov(N2, Overflow);
return Overflow;
},
[](const ConstantRange &CR1, const ConstantRange &CR2) {
return CR1.unsignedSubMayOverflow(CR2);
});
}
TEST_F(ConstantRangeTest, SignedAddOverflowExhautive) {
TestOverflowExhaustive(
[](const APInt &N1, const APInt &N2) {
bool Overflow;
N1.sadd_ov(N2, Overflow);
return Overflow;
},
[](const ConstantRange &CR1, const ConstantRange &CR2) {
return CR1.signedAddMayOverflow(CR2);
});
}
TEST_F(ConstantRangeTest, SignedSubOverflowExhautive) {
TestOverflowExhaustive(
[](const APInt &N1, const APInt &N2) {
bool Overflow;
N1.ssub_ov(N2, Overflow);
return Overflow;
},
[](const ConstantRange &CR1, const ConstantRange &CR2) {
return CR1.signedSubMayOverflow(CR2);
});
}
} // anonymous namespace
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