49 lines
2.8 KiB
C
49 lines
2.8 KiB
C
/*-*- mode:c;indent-tabs-mode:nil;c-basic-offset:2;tab-width:8;coding:utf-8 -*-│
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│vi: set net ft=c ts=2 sts=2 sw=2 fenc=utf-8 :vi│
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╞══════════════════════════════════════════════════════════════════════════════╡
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│ Copyright 2020 Justine Alexandra Roberts Tunney │
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│ │
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│ This program is free software; you can redistribute it and/or modify │
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│ it under the terms of the GNU General Public License as published by │
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│ the Free Software Foundation; version 2 of the License. │
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│ │
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│ This program is distributed in the hope that it will be useful, but │
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│ WITHOUT ANY WARRANTY; without even the implied warranty of │
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│ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU │
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│ General Public License for more details. │
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│ │
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│ You should have received a copy of the GNU General Public License │
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│ along with this program; if not, write to the Free Software │
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│ Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA │
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│ 02110-1301 USA │
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╚─────────────────────────────────────────────────────────────────────────────*/
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#include "libc/bits/bits.h"
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#include "libc/limits.h"
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#include "libc/macros.h"
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#include "libc/testlib/testlib.h"
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#define ROR(w, k) (CheckUnsigned(w) >> (k) | (w) << (sizeof(w) * 8 - (k)))
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#define ROL(w, k) ((w) << (k) | CheckUnsigned(w) >> (sizeof(w) * 8 - (k)))
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TEST(TwosComplementBane, LiteralsThatAreLiterallyTheSameNumber) {
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EXPECT_EQ(4, sizeof(INT_MIN));
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EXPECT_EQ(8, sizeof(-2147483648));
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EXPECT_TRUE(TYPE_SIGNED(-2147483648));
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EXPECT_FALSE(TYPE_SIGNED(0x80000000));
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EXPECT_FALSE(TYPE_SIGNED(-0x80000000));
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}
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TEST(RotateRight, Test) {
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EXPECT_EQ(0x41122334u, ROR(0x11223344u, 4));
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EXPECT_EQ(0x44112233u, ROR(0x11223344u, 8));
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EXPECT_EQ(0x34411223u, ROR(0x11223344u, 12));
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EXPECT_EQ(0x33441122u, ROR(0x11223344u, 16));
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}
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TEST(RotateLeft, Test) {
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EXPECT_EQ(0x12233441u, ROL(0x11223344u, 4));
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EXPECT_EQ(0x22334411u, ROL(0x11223344u, 8));
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EXPECT_EQ(0x23344112u, ROL(0x11223344u, 12));
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EXPECT_EQ(0x33441122u, ROL(0x11223344u, 16));
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}
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