449 lines
16 KiB
C++
449 lines
16 KiB
C++
//===- llvm/unittest/Support/KnownBitsTest.cpp - KnownBits 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
|
|
//
|
|
//===----------------------------------------------------------------------===//
|
|
//
|
|
// This file implements unit tests for KnownBits functions.
|
|
//
|
|
//===----------------------------------------------------------------------===//
|
|
|
|
#include "llvm/Support/KnownBits.h"
|
|
#include "KnownBitsTest.h"
|
|
#include "gtest/gtest.h"
|
|
|
|
using namespace llvm;
|
|
|
|
namespace {
|
|
|
|
TEST(KnownBitsTest, AddCarryExhaustive) {
|
|
unsigned Bits = 4;
|
|
ForeachKnownBits(Bits, [&](const KnownBits &Known1) {
|
|
ForeachKnownBits(Bits, [&](const KnownBits &Known2) {
|
|
ForeachKnownBits(1, [&](const KnownBits &KnownCarry) {
|
|
// Explicitly compute known bits of the addition by trying all
|
|
// possibilities.
|
|
KnownBits Known(Bits);
|
|
Known.Zero.setAllBits();
|
|
Known.One.setAllBits();
|
|
ForeachNumInKnownBits(Known1, [&](const APInt &N1) {
|
|
ForeachNumInKnownBits(Known2, [&](const APInt &N2) {
|
|
ForeachNumInKnownBits(KnownCarry, [&](const APInt &Carry) {
|
|
APInt Add = N1 + N2;
|
|
if (Carry.getBoolValue())
|
|
++Add;
|
|
|
|
Known.One &= Add;
|
|
Known.Zero &= ~Add;
|
|
});
|
|
});
|
|
});
|
|
|
|
KnownBits KnownComputed = KnownBits::computeForAddCarry(
|
|
Known1, Known2, KnownCarry);
|
|
EXPECT_EQ(Known.Zero, KnownComputed.Zero);
|
|
EXPECT_EQ(Known.One, KnownComputed.One);
|
|
});
|
|
});
|
|
});
|
|
}
|
|
|
|
static void TestAddSubExhaustive(bool IsAdd) {
|
|
unsigned Bits = 4;
|
|
ForeachKnownBits(Bits, [&](const KnownBits &Known1) {
|
|
ForeachKnownBits(Bits, [&](const KnownBits &Known2) {
|
|
KnownBits Known(Bits), KnownNSW(Bits);
|
|
Known.Zero.setAllBits();
|
|
Known.One.setAllBits();
|
|
KnownNSW.Zero.setAllBits();
|
|
KnownNSW.One.setAllBits();
|
|
|
|
ForeachNumInKnownBits(Known1, [&](const APInt &N1) {
|
|
ForeachNumInKnownBits(Known2, [&](const APInt &N2) {
|
|
bool Overflow;
|
|
APInt Res;
|
|
if (IsAdd)
|
|
Res = N1.sadd_ov(N2, Overflow);
|
|
else
|
|
Res = N1.ssub_ov(N2, Overflow);
|
|
|
|
Known.One &= Res;
|
|
Known.Zero &= ~Res;
|
|
|
|
if (!Overflow) {
|
|
KnownNSW.One &= Res;
|
|
KnownNSW.Zero &= ~Res;
|
|
}
|
|
});
|
|
});
|
|
|
|
KnownBits KnownComputed = KnownBits::computeForAddSub(
|
|
IsAdd, /*NSW*/false, Known1, Known2);
|
|
EXPECT_EQ(Known.Zero, KnownComputed.Zero);
|
|
EXPECT_EQ(Known.One, KnownComputed.One);
|
|
|
|
// The NSW calculation is not precise, only check that it's
|
|
// conservatively correct.
|
|
KnownBits KnownNSWComputed = KnownBits::computeForAddSub(
|
|
IsAdd, /*NSW*/true, Known1, Known2);
|
|
EXPECT_TRUE(KnownNSWComputed.Zero.isSubsetOf(KnownNSW.Zero));
|
|
EXPECT_TRUE(KnownNSWComputed.One.isSubsetOf(KnownNSW.One));
|
|
});
|
|
});
|
|
}
|
|
|
|
TEST(KnownBitsTest, AddSubExhaustive) {
|
|
TestAddSubExhaustive(true);
|
|
TestAddSubExhaustive(false);
|
|
}
|
|
|
|
TEST(KnownBitsTest, BinaryExhaustive) {
|
|
unsigned Bits = 4;
|
|
ForeachKnownBits(Bits, [&](const KnownBits &Known1) {
|
|
ForeachKnownBits(Bits, [&](const KnownBits &Known2) {
|
|
KnownBits KnownAnd(Bits);
|
|
KnownAnd.Zero.setAllBits();
|
|
KnownAnd.One.setAllBits();
|
|
KnownBits KnownOr(KnownAnd);
|
|
KnownBits KnownXor(KnownAnd);
|
|
KnownBits KnownUMax(KnownAnd);
|
|
KnownBits KnownUMin(KnownAnd);
|
|
KnownBits KnownSMax(KnownAnd);
|
|
KnownBits KnownSMin(KnownAnd);
|
|
KnownBits KnownMul(KnownAnd);
|
|
KnownBits KnownUDiv(KnownAnd);
|
|
KnownBits KnownURem(KnownAnd);
|
|
KnownBits KnownSRem(KnownAnd);
|
|
KnownBits KnownShl(KnownAnd);
|
|
KnownBits KnownLShr(KnownAnd);
|
|
KnownBits KnownAShr(KnownAnd);
|
|
|
|
ForeachNumInKnownBits(Known1, [&](const APInt &N1) {
|
|
ForeachNumInKnownBits(Known2, [&](const APInt &N2) {
|
|
APInt Res;
|
|
|
|
Res = N1 & N2;
|
|
KnownAnd.One &= Res;
|
|
KnownAnd.Zero &= ~Res;
|
|
|
|
Res = N1 | N2;
|
|
KnownOr.One &= Res;
|
|
KnownOr.Zero &= ~Res;
|
|
|
|
Res = N1 ^ N2;
|
|
KnownXor.One &= Res;
|
|
KnownXor.Zero &= ~Res;
|
|
|
|
Res = APIntOps::umax(N1, N2);
|
|
KnownUMax.One &= Res;
|
|
KnownUMax.Zero &= ~Res;
|
|
|
|
Res = APIntOps::umin(N1, N2);
|
|
KnownUMin.One &= Res;
|
|
KnownUMin.Zero &= ~Res;
|
|
|
|
Res = APIntOps::smax(N1, N2);
|
|
KnownSMax.One &= Res;
|
|
KnownSMax.Zero &= ~Res;
|
|
|
|
Res = APIntOps::smin(N1, N2);
|
|
KnownSMin.One &= Res;
|
|
KnownSMin.Zero &= ~Res;
|
|
|
|
Res = N1 * N2;
|
|
KnownMul.One &= Res;
|
|
KnownMul.Zero &= ~Res;
|
|
|
|
if (!N2.isNullValue()) {
|
|
Res = N1.udiv(N2);
|
|
KnownUDiv.One &= Res;
|
|
KnownUDiv.Zero &= ~Res;
|
|
|
|
Res = N1.urem(N2);
|
|
KnownURem.One &= Res;
|
|
KnownURem.Zero &= ~Res;
|
|
|
|
Res = N1.srem(N2);
|
|
KnownSRem.One &= Res;
|
|
KnownSRem.Zero &= ~Res;
|
|
}
|
|
|
|
if (N2.ult(1ULL << N1.getBitWidth())) {
|
|
Res = N1.shl(N2);
|
|
KnownShl.One &= Res;
|
|
KnownShl.Zero &= ~Res;
|
|
|
|
Res = N1.lshr(N2);
|
|
KnownLShr.One &= Res;
|
|
KnownLShr.Zero &= ~Res;
|
|
|
|
Res = N1.ashr(N2);
|
|
KnownAShr.One &= Res;
|
|
KnownAShr.Zero &= ~Res;
|
|
} else {
|
|
KnownShl.resetAll();
|
|
KnownLShr.resetAll();
|
|
KnownAShr.resetAll();
|
|
}
|
|
});
|
|
});
|
|
|
|
KnownBits ComputedAnd = Known1 & Known2;
|
|
EXPECT_EQ(KnownAnd.Zero, ComputedAnd.Zero);
|
|
EXPECT_EQ(KnownAnd.One, ComputedAnd.One);
|
|
|
|
KnownBits ComputedOr = Known1 | Known2;
|
|
EXPECT_EQ(KnownOr.Zero, ComputedOr.Zero);
|
|
EXPECT_EQ(KnownOr.One, ComputedOr.One);
|
|
|
|
KnownBits ComputedXor = Known1 ^ Known2;
|
|
EXPECT_EQ(KnownXor.Zero, ComputedXor.Zero);
|
|
EXPECT_EQ(KnownXor.One, ComputedXor.One);
|
|
|
|
KnownBits ComputedUMax = KnownBits::umax(Known1, Known2);
|
|
EXPECT_EQ(KnownUMax.Zero, ComputedUMax.Zero);
|
|
EXPECT_EQ(KnownUMax.One, ComputedUMax.One);
|
|
|
|
KnownBits ComputedUMin = KnownBits::umin(Known1, Known2);
|
|
EXPECT_EQ(KnownUMin.Zero, ComputedUMin.Zero);
|
|
EXPECT_EQ(KnownUMin.One, ComputedUMin.One);
|
|
|
|
KnownBits ComputedSMax = KnownBits::smax(Known1, Known2);
|
|
EXPECT_EQ(KnownSMax.Zero, ComputedSMax.Zero);
|
|
EXPECT_EQ(KnownSMax.One, ComputedSMax.One);
|
|
|
|
KnownBits ComputedSMin = KnownBits::smin(Known1, Known2);
|
|
EXPECT_EQ(KnownSMin.Zero, ComputedSMin.Zero);
|
|
EXPECT_EQ(KnownSMin.One, ComputedSMin.One);
|
|
|
|
// ComputedMul is conservatively correct, but not guaranteed to be
|
|
// precise.
|
|
KnownBits ComputedMul = KnownBits::computeForMul(Known1, Known2);
|
|
EXPECT_TRUE(ComputedMul.Zero.isSubsetOf(KnownMul.Zero));
|
|
EXPECT_TRUE(ComputedMul.One.isSubsetOf(KnownMul.One));
|
|
|
|
KnownBits ComputedUDiv = KnownBits::udiv(Known1, Known2);
|
|
EXPECT_TRUE(ComputedUDiv.Zero.isSubsetOf(KnownUDiv.Zero));
|
|
EXPECT_TRUE(ComputedUDiv.One.isSubsetOf(KnownUDiv.One));
|
|
|
|
KnownBits ComputedURem = KnownBits::urem(Known1, Known2);
|
|
EXPECT_TRUE(ComputedURem.Zero.isSubsetOf(KnownURem.Zero));
|
|
EXPECT_TRUE(ComputedURem.One.isSubsetOf(KnownURem.One));
|
|
|
|
KnownBits ComputedSRem = KnownBits::srem(Known1, Known2);
|
|
EXPECT_TRUE(ComputedSRem.Zero.isSubsetOf(KnownSRem.Zero));
|
|
EXPECT_TRUE(ComputedSRem.One.isSubsetOf(KnownSRem.One));
|
|
|
|
KnownBits ComputedShl = KnownBits::shl(Known1, Known2);
|
|
EXPECT_TRUE(ComputedShl.Zero.isSubsetOf(KnownShl.Zero));
|
|
EXPECT_TRUE(ComputedShl.One.isSubsetOf(KnownShl.One));
|
|
|
|
KnownBits ComputedLShr = KnownBits::lshr(Known1, Known2);
|
|
EXPECT_TRUE(ComputedLShr.Zero.isSubsetOf(KnownLShr.Zero));
|
|
EXPECT_TRUE(ComputedLShr.One.isSubsetOf(KnownLShr.One));
|
|
|
|
KnownBits ComputedAShr = KnownBits::ashr(Known1, Known2);
|
|
EXPECT_TRUE(ComputedAShr.Zero.isSubsetOf(KnownAShr.Zero));
|
|
EXPECT_TRUE(ComputedAShr.One.isSubsetOf(KnownAShr.One));
|
|
});
|
|
});
|
|
}
|
|
|
|
TEST(KnownBitsTest, UnaryExhaustive) {
|
|
unsigned Bits = 4;
|
|
ForeachKnownBits(Bits, [&](const KnownBits &Known) {
|
|
KnownBits KnownAbs(Bits);
|
|
KnownAbs.Zero.setAllBits();
|
|
KnownAbs.One.setAllBits();
|
|
KnownBits KnownAbsPoison(KnownAbs);
|
|
|
|
ForeachNumInKnownBits(Known, [&](const APInt &N) {
|
|
APInt Res = N.abs();
|
|
KnownAbs.One &= Res;
|
|
KnownAbs.Zero &= ~Res;
|
|
|
|
if (!N.isMinSignedValue()) {
|
|
KnownAbsPoison.One &= Res;
|
|
KnownAbsPoison.Zero &= ~Res;
|
|
}
|
|
});
|
|
|
|
// abs() is conservatively correct, but not guaranteed to be precise.
|
|
KnownBits ComputedAbs = Known.abs();
|
|
EXPECT_TRUE(ComputedAbs.Zero.isSubsetOf(KnownAbs.Zero));
|
|
EXPECT_TRUE(ComputedAbs.One.isSubsetOf(KnownAbs.One));
|
|
|
|
KnownBits ComputedAbsPoison = Known.abs(true);
|
|
EXPECT_TRUE(ComputedAbsPoison.Zero.isSubsetOf(KnownAbsPoison.Zero));
|
|
EXPECT_TRUE(ComputedAbsPoison.One.isSubsetOf(KnownAbsPoison.One));
|
|
});
|
|
}
|
|
|
|
TEST(KnownBitsTest, ICmpExhaustive) {
|
|
unsigned Bits = 4;
|
|
ForeachKnownBits(Bits, [&](const KnownBits &Known1) {
|
|
ForeachKnownBits(Bits, [&](const KnownBits &Known2) {
|
|
bool AllEQ = true, NoneEQ = true;
|
|
bool AllNE = true, NoneNE = true;
|
|
bool AllUGT = true, NoneUGT = true;
|
|
bool AllUGE = true, NoneUGE = true;
|
|
bool AllULT = true, NoneULT = true;
|
|
bool AllULE = true, NoneULE = true;
|
|
bool AllSGT = true, NoneSGT = true;
|
|
bool AllSGE = true, NoneSGE = true;
|
|
bool AllSLT = true, NoneSLT = true;
|
|
bool AllSLE = true, NoneSLE = true;
|
|
|
|
ForeachNumInKnownBits(Known1, [&](const APInt &N1) {
|
|
ForeachNumInKnownBits(Known2, [&](const APInt &N2) {
|
|
AllEQ &= N1.eq(N2);
|
|
AllNE &= N1.ne(N2);
|
|
AllUGT &= N1.ugt(N2);
|
|
AllUGE &= N1.uge(N2);
|
|
AllULT &= N1.ult(N2);
|
|
AllULE &= N1.ule(N2);
|
|
AllSGT &= N1.sgt(N2);
|
|
AllSGE &= N1.sge(N2);
|
|
AllSLT &= N1.slt(N2);
|
|
AllSLE &= N1.sle(N2);
|
|
NoneEQ &= !N1.eq(N2);
|
|
NoneNE &= !N1.ne(N2);
|
|
NoneUGT &= !N1.ugt(N2);
|
|
NoneUGE &= !N1.uge(N2);
|
|
NoneULT &= !N1.ult(N2);
|
|
NoneULE &= !N1.ule(N2);
|
|
NoneSGT &= !N1.sgt(N2);
|
|
NoneSGE &= !N1.sge(N2);
|
|
NoneSLT &= !N1.slt(N2);
|
|
NoneSLE &= !N1.sle(N2);
|
|
});
|
|
});
|
|
|
|
Optional<bool> KnownEQ = KnownBits::eq(Known1, Known2);
|
|
Optional<bool> KnownNE = KnownBits::ne(Known1, Known2);
|
|
Optional<bool> KnownUGT = KnownBits::ugt(Known1, Known2);
|
|
Optional<bool> KnownUGE = KnownBits::uge(Known1, Known2);
|
|
Optional<bool> KnownULT = KnownBits::ult(Known1, Known2);
|
|
Optional<bool> KnownULE = KnownBits::ule(Known1, Known2);
|
|
Optional<bool> KnownSGT = KnownBits::sgt(Known1, Known2);
|
|
Optional<bool> KnownSGE = KnownBits::sge(Known1, Known2);
|
|
Optional<bool> KnownSLT = KnownBits::slt(Known1, Known2);
|
|
Optional<bool> KnownSLE = KnownBits::sle(Known1, Known2);
|
|
|
|
EXPECT_EQ(AllEQ || NoneEQ, KnownEQ.hasValue());
|
|
EXPECT_EQ(AllNE || NoneNE, KnownNE.hasValue());
|
|
EXPECT_EQ(AllUGT || NoneUGT, KnownUGT.hasValue());
|
|
EXPECT_EQ(AllUGE || NoneUGE, KnownUGE.hasValue());
|
|
EXPECT_EQ(AllULT || NoneULT, KnownULT.hasValue());
|
|
EXPECT_EQ(AllULE || NoneULE, KnownULE.hasValue());
|
|
EXPECT_EQ(AllSGT || NoneSGT, KnownSGT.hasValue());
|
|
EXPECT_EQ(AllSGE || NoneSGE, KnownSGE.hasValue());
|
|
EXPECT_EQ(AllSLT || NoneSLT, KnownSLT.hasValue());
|
|
EXPECT_EQ(AllSLE || NoneSLE, KnownSLE.hasValue());
|
|
|
|
EXPECT_EQ(AllEQ, KnownEQ.hasValue() && KnownEQ.getValue());
|
|
EXPECT_EQ(AllNE, KnownNE.hasValue() && KnownNE.getValue());
|
|
EXPECT_EQ(AllUGT, KnownUGT.hasValue() && KnownUGT.getValue());
|
|
EXPECT_EQ(AllUGE, KnownUGE.hasValue() && KnownUGE.getValue());
|
|
EXPECT_EQ(AllULT, KnownULT.hasValue() && KnownULT.getValue());
|
|
EXPECT_EQ(AllULE, KnownULE.hasValue() && KnownULE.getValue());
|
|
EXPECT_EQ(AllSGT, KnownSGT.hasValue() && KnownSGT.getValue());
|
|
EXPECT_EQ(AllSGE, KnownSGE.hasValue() && KnownSGE.getValue());
|
|
EXPECT_EQ(AllSLT, KnownSLT.hasValue() && KnownSLT.getValue());
|
|
EXPECT_EQ(AllSLE, KnownSLE.hasValue() && KnownSLE.getValue());
|
|
|
|
EXPECT_EQ(NoneEQ, KnownEQ.hasValue() && !KnownEQ.getValue());
|
|
EXPECT_EQ(NoneNE, KnownNE.hasValue() && !KnownNE.getValue());
|
|
EXPECT_EQ(NoneUGT, KnownUGT.hasValue() && !KnownUGT.getValue());
|
|
EXPECT_EQ(NoneUGE, KnownUGE.hasValue() && !KnownUGE.getValue());
|
|
EXPECT_EQ(NoneULT, KnownULT.hasValue() && !KnownULT.getValue());
|
|
EXPECT_EQ(NoneULE, KnownULE.hasValue() && !KnownULE.getValue());
|
|
EXPECT_EQ(NoneSGT, KnownSGT.hasValue() && !KnownSGT.getValue());
|
|
EXPECT_EQ(NoneSGE, KnownSGE.hasValue() && !KnownSGE.getValue());
|
|
EXPECT_EQ(NoneSLT, KnownSLT.hasValue() && !KnownSLT.getValue());
|
|
EXPECT_EQ(NoneSLE, KnownSLE.hasValue() && !KnownSLE.getValue());
|
|
});
|
|
});
|
|
}
|
|
|
|
TEST(KnownBitsTest, GetMinMaxVal) {
|
|
unsigned Bits = 4;
|
|
ForeachKnownBits(Bits, [&](const KnownBits &Known) {
|
|
APInt Min = APInt::getMaxValue(Bits);
|
|
APInt Max = APInt::getMinValue(Bits);
|
|
ForeachNumInKnownBits(Known, [&](const APInt &N) {
|
|
Min = APIntOps::umin(Min, N);
|
|
Max = APIntOps::umax(Max, N);
|
|
});
|
|
EXPECT_EQ(Min, Known.getMinValue());
|
|
EXPECT_EQ(Max, Known.getMaxValue());
|
|
});
|
|
}
|
|
|
|
TEST(KnownBitsTest, GetSignedMinMaxVal) {
|
|
unsigned Bits = 4;
|
|
ForeachKnownBits(Bits, [&](const KnownBits &Known) {
|
|
APInt Min = APInt::getSignedMaxValue(Bits);
|
|
APInt Max = APInt::getSignedMinValue(Bits);
|
|
ForeachNumInKnownBits(Known, [&](const APInt &N) {
|
|
Min = APIntOps::smin(Min, N);
|
|
Max = APIntOps::smax(Max, N);
|
|
});
|
|
EXPECT_EQ(Min, Known.getSignedMinValue());
|
|
EXPECT_EQ(Max, Known.getSignedMaxValue());
|
|
});
|
|
}
|
|
|
|
TEST(KnownBitsTest, SExtOrTrunc) {
|
|
const unsigned NarrowerSize = 4;
|
|
const unsigned BaseSize = 6;
|
|
const unsigned WiderSize = 8;
|
|
APInt NegativeFitsNarrower(BaseSize, -4, /*isSigned*/ true);
|
|
APInt NegativeDoesntFitNarrower(BaseSize, -28, /*isSigned*/ true);
|
|
APInt PositiveFitsNarrower(BaseSize, 14);
|
|
APInt PositiveDoesntFitNarrower(BaseSize, 36);
|
|
auto InitKnownBits = [&](KnownBits &Res, const APInt &Input) {
|
|
Res = KnownBits(Input.getBitWidth());
|
|
Res.One = Input;
|
|
Res.Zero = ~Input;
|
|
};
|
|
|
|
for (unsigned Size : {NarrowerSize, BaseSize, WiderSize}) {
|
|
for (const APInt &Input :
|
|
{NegativeFitsNarrower, NegativeDoesntFitNarrower, PositiveFitsNarrower,
|
|
PositiveDoesntFitNarrower}) {
|
|
KnownBits Test;
|
|
InitKnownBits(Test, Input);
|
|
KnownBits Baseline;
|
|
InitKnownBits(Baseline, Input.sextOrTrunc(Size));
|
|
Test = Test.sextOrTrunc(Size);
|
|
EXPECT_EQ(Test.One, Baseline.One);
|
|
EXPECT_EQ(Test.Zero, Baseline.Zero);
|
|
}
|
|
}
|
|
}
|
|
|
|
TEST(KnownBitsTest, SExtInReg) {
|
|
unsigned Bits = 4;
|
|
for (unsigned FromBits = 1; FromBits <= Bits; ++FromBits) {
|
|
ForeachKnownBits(Bits, [&](const KnownBits &Known) {
|
|
APInt CommonOne = APInt::getAllOnesValue(Bits);
|
|
APInt CommonZero = APInt::getAllOnesValue(Bits);
|
|
unsigned ExtBits = Bits - FromBits;
|
|
ForeachNumInKnownBits(Known, [&](const APInt &N) {
|
|
APInt Ext = N << ExtBits;
|
|
Ext.ashrInPlace(ExtBits);
|
|
CommonOne &= Ext;
|
|
CommonZero &= ~Ext;
|
|
});
|
|
KnownBits KnownSExtInReg = Known.sextInReg(FromBits);
|
|
EXPECT_EQ(CommonOne, KnownSExtInReg.One);
|
|
EXPECT_EQ(CommonZero, KnownSExtInReg.Zero);
|
|
});
|
|
}
|
|
}
|
|
|
|
} // end anonymous namespace
|