48 lines
2.7 KiB
C
48 lines
2.7 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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│ Permission to use, copy, modify, and/or distribute this software for │
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│ any purpose with or without fee is hereby granted, provided that the │
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│ above copyright notice and this permission notice appear in all copies. │
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│ │
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│ THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL │
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│ WARRANTIES WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED │
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│ WARRANTIES OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE │
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│ AUTHOR BE LIABLE FOR ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL │
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│ DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR │
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│ PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER │
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│ TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR │
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│ PERFORMANCE OF THIS SOFTWARE. │
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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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