/* * 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 #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)); }