/*
* Copyright (c) 2019 The Regents of the University of California
* All rights reserved
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are
* met: redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer;
* redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution;
* neither the name of the copyright holders nor the names of its
* contributors may be used to endorse or promote products derived from
* this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
* OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*
* Authors: Bobby R. Bruce
* Jared J. Barocsi
*/
#include <gtest/gtest.h>
#include "base/condcodes.hh"
/*
* Add 0x80 + 0x80 to get 0x100. findCarry should report a carry flag after
* this operation.
*/
TEST(CondCodes, FindCarryWithNoCarryIn8Bit)
{
EXPECT_TRUE(findCarry(8, 0x100, 0x80, 0x80));
}
/*
* Add 0xf0 + 0x0f to get 0xff. findCarry should not report a carry flag after
* this operation.
*/
TEST(CondCodes, FindNoCarryWithNoCarryIn8Bit)
{
EXPECT_FALSE(findCarry(8, 0xff, 0xf0, 0x0f));
}
/*
* Add 0x7f + 0x80 + 0x01 to get 0x100. findCarry should report a carry flag
* after this operation.
*/
TEST(CondCodes, FindCarryWithCarryIn8Bit)
{
EXPECT_TRUE(findCarry(8, 0x100, 0x80, 0x7f));
}
/*
* Add 0x80 + 0x7e + 0x01 to get 0xff. findCarry should not report a carry
* flag after this operation.
*/
TEST(CondCodes, FindNoCarryWithCarryIn8Bit)
{
EXPECT_FALSE(findCarry(8, 0xff, 0x80, 0x7e));
}
/*
* Add 0x80000000 + 0x80000000 to get 0x100000000. findCarry should report a
* carry flag after this operation.
*/
TEST(CondCodes, FindCarryWithNoCarryIn32Bit)
{
EXPECT_TRUE(findCarry(32, 0x100000000, 0x80000000, 0x80000000));
}
/*
* Add 0xffff0000 + 0x0000ffff to get 0xffffffff. findCarry should not report a
* carry flag after this operation.
*/
TEST(CondCodes, FindNoCarryWithNoCarryIn32Bit)
{
EXPECT_FALSE(findCarry(32, 0xffffffff, 0xffff0000, 0x0000ffff));
}
TEST(CondCodes, FindCarryWithCarryIn32Bit)
{
/*
* Add 0x80000000 + 0x7fffffff + 0x00000001 to get 0x100000000,
* resulting in a carry
*/
EXPECT_TRUE(findCarry(32, 0x100000000, 0x80000000, 0x7fffffff));
// Add 0x80000000 + 0x7ffffffe + 0x00000001 to get 0xffffffff,
// resulting in no carry
EXPECT_FALSE(findCarry(32, 0xffffffff, 0x80000000, 0x7ffffffe));
// Add 0xffffffff + 0x00000000 + 0x00000001 to get 0x100000000,
// resulting in a carry
EXPECT_TRUE(findCarry(32, 0x100000000, 0xffffffff, 0x00000000));
}
TEST(CondCodes, FindCarryWithNoCarryIn64Bit)
{
// Add 0x8000000000000000 + 0x8000000000000000 to get 0x10000000000000000,
// (unrepresentable with uint64_t), resulting in a carry
EXPECT_TRUE(findCarry(64, 0x0000000000000000,
0x8000000000000000,
0x8000000000000000));
/*
* Add 0x0000000000000000 + 0x0000000000000000 to get 0x0000000000000000
* resulting in no carry
* We get the same sum as above case due to unrepresentability, but we
* should still expect no carry
*/
EXPECT_FALSE(findCarry(64, 0x0000000000000000,
0x0000000000000000,
0x0000000000000000));
/*
* Add 0x8000000000000000 + 0x7fffffffffffffff to get 0xffffffffffffffff,
* resulting in no carry
*/
EXPECT_FALSE(findCarry(64, 0xffffffffffffffff,
0x8000000000000000,
0x7fffffffffffffff));
/*
* Add 0xffffffff00000000 + 0x00000000ffffffff to get 0xffffffffffffffff,
* resulting in no carry
*/
EXPECT_FALSE(findCarry(64, 0xffffffffffffffff,
0xffffffff00000000,
0x00000000ffffffff));
}
TEST(CondCodes, FindCarryWithCarryIn64Bit)
{
/* Add 0x8000000000000000 + 0x8000000000000000 + 0x0000000000000001
* to get 0x1 000000000000001 (unrepresentable with uint64_t),
* resulting in a carry
*/
EXPECT_TRUE(findCarry(64, 0x0000000000000000,
0x8000000000000000,
0x7fffffffffffffff));
/*
* Add 0x0000000000000000 + 0x0000000000000000 + 0x0000000000000001
* resulting in no carry
* We get the same sum as the above case due to unrepresentability, but we
* should still expect no carry
*/
EXPECT_FALSE(findCarry(64, 0x0000000000000001,
0x0000000000000000,
0x0000000000000000));
/*
* Add 0x8000000000000000 + 0x7fffffffffffffff + 0x0000000000000001
* to get 0x1 0000000000000000 (unrepresentable with uint64_t),
* resulting in a carry
*/
EXPECT_TRUE(findCarry(64, 0x0000000000000000,
0x8000000000000000,
0x7fffffffffffffff));
/*
* Add 0xffffffff00000000 + 0x000000000000000 + 0x0000000000000001
* to get 0x1 0000000000000000 (unrepresentable with uint64_t),
* resulting in a carry
*/
EXPECT_TRUE(findCarry(64, 0x0000000000000000,
0xffffffffffffffff,
0x0000000000000001));
}
TEST(CondCodes, FindOverflow8Bit)
{
/*
* Addition of 127 + 1 = 128 or -128 as signed two's complement.
* Overflow occurs in this case
*/
EXPECT_TRUE(findOverflow(8, 0x80, 0x7f, 0x01));
/*
* Addition of 64 + 63 = 127, or 127 as signed two's complement.
* No overflow occurs
*/
EXPECT_FALSE(findOverflow(8, 0x7f, 0x40, 0x3f));
}
TEST(CondCodes, FindOverflow32Bit)
{
/*
* Addition of 2,147,483,647 + 1 = 2,147,483,648, or -2,147,483,648 as
* signed two's complement. Overflow occurs in this case
*/
EXPECT_TRUE(findOverflow(32, 0x80000000, 0x7fffffff, 0x00000001));
/*
* Addition of 1,073,741,824 + 1,073,741,823 = 2,147,483,647, or
* 2,147,483,647 as signed two's complement. No overflow occurs
*/
EXPECT_FALSE(findOverflow(32, 0x7fffffff, 0x40000000, 0x3fffffff));
}
TEST(CondCodes, FindOverflow64Bit)
{
/*
* Addition of 0x7fffffffffffffff + 0x0000000000000001 =
* 0x8000000000000000, or -9,223,372,036,854,775,808 as signed two's
* complement. Overflow occurs in this case
*/
EXPECT_TRUE(findOverflow(64, 0x8000000000000000,
0x7fffffffffffffff,
0x0000000000000001));
/* Addition of 0x4000000000000000 + 0x3fffffffffffffff =
* 0x7fffffffffffffff, or 9,223,372,036,854,775,807 as signed two's
* complement. No overflow occurs
*/
EXPECT_FALSE(findOverflow(64, 0x7fffffffffffffff,
0x4000000000000000,
0x3fffffffffffffff));
}
TEST(CondCodes, OddParity)
{
EXPECT_EQ(1, findParity(8, 1));
}
TEST(CondCodes, EvenParity)
{
EXPECT_EQ(0, findParity(8, 3));
}
TEST(CondCodes, OddParityOverflow)
{
EXPECT_EQ(1, findParity(8, 0x102));
}
TEST(CondCodes, EvenParityOverflow)
{
EXPECT_EQ(0, findParity(4,0x43));
}
TEST(CondCodes, IsNegative)
{
EXPECT_EQ(1, findNegative(8, 128));
}
TEST(CondCodes, IsNotNegative)
{
EXPECT_EQ(0, findNegative(8, 127));
}
TEST(CondCodes, IsZero)
{
EXPECT_EQ(1, findZero(8, 0));
}
TEST(CondCodes, IsNotZero)
{
EXPECT_EQ(0, findZero(8, 1));
}
TEST(CondCodes, IsZeroOverflow)
{
EXPECT_EQ(1, findZero(8,0x100));
}