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https://gitlab.com/qemu-project/qemu
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f539fbe337
Implements 128-bit left shift and right shift as well as their testcases. By design, shift silently mods by 128, so the caller is responsible to assert the shift range if necessary. Left shift sets the overflow flag if any non-zero digit is shifted out. Examples: ulshift(&low, &high, 250, &overflow); equivalent: n << 122 urshift(&low, &high, -2); equivalent: n << 126 Signed-off-by: Jose Ricardo Ziviani <joserz@linux.vnet.ibm.com> Reviewed-by: Eric Blake <eblake@redhat.com> [dwg: Added test-shift128 to .gitignore] Signed-off-by: David Gibson <david@gibson.dropbear.id.au>
139 lines
5.5 KiB
C
139 lines
5.5 KiB
C
/*
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* Test unsigned left and right shift
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*
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* This work is licensed under the terms of the GNU LGPL, version 2 or later.
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* See the COPYING.LIB file in the top-level directory.
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*
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*/
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#include "qemu/osdep.h"
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#include "qemu/host-utils.h"
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typedef struct {
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uint64_t low;
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uint64_t high;
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uint64_t rlow;
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uint64_t rhigh;
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int32_t shift;
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bool overflow;
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} test_data;
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static const test_data test_ltable[] = {
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{ 0x4C7ULL, 0x0ULL, 0x00000000000004C7ULL,
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0x0000000000000000ULL, 0, false },
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{ 0x001ULL, 0x0ULL, 0x0000000000000002ULL,
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0x0000000000000000ULL, 1, false },
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{ 0x001ULL, 0x0ULL, 0x0000000000000004ULL,
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0x0000000000000000ULL, 2, false },
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{ 0x001ULL, 0x0ULL, 0x0000000000000010ULL,
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0x0000000000000000ULL, 4, false },
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{ 0x001ULL, 0x0ULL, 0x0000000000000100ULL,
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0x0000000000000000ULL, 8, false },
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{ 0x001ULL, 0x0ULL, 0x0000000000010000ULL,
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0x0000000000000000ULL, 16, false },
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{ 0x001ULL, 0x0ULL, 0x0000000080000000ULL,
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0x0000000000000000ULL, 31, false },
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{ 0x001ULL, 0x0ULL, 0x0000200000000000ULL,
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0x0000000000000000ULL, 45, false },
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{ 0x001ULL, 0x0ULL, 0x1000000000000000ULL,
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0x0000000000000000ULL, 60, false },
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{ 0x001ULL, 0x0ULL, 0x0000000000000000ULL,
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0x0000000000000001ULL, 64, false },
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{ 0x001ULL, 0x0ULL, 0x0000000000000000ULL,
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0x0000000000010000ULL, 80, false },
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{ 0x001ULL, 0x0ULL, 0x0000000000000000ULL,
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0x8000000000000000ULL, 127, false },
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{ 0x000ULL, 0x1ULL, 0x0000000000000000ULL,
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0x0000000000000000ULL, 64, true },
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{ 0x008ULL, 0x0ULL, 0x0000000000000000ULL,
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0x0000000000000008ULL, 64, false },
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{ 0x008ULL, 0x0ULL, 0x0000000000000000ULL,
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0x8000000000000000ULL, 124, false },
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{ 0x001ULL, 0x0ULL, 0x0000000000000000ULL,
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0x4000000000000000ULL, 126, false },
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{ 0x001ULL, 0x0ULL, 0x0000000000000000ULL,
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0x8000000000000000ULL, 127, false },
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{ 0x001ULL, 0x0ULL, 0x0000000000000001ULL,
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0x0000000000000000ULL, 128, false },
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{ 0x000ULL, 0x0ULL, 0x0000000000000000ULL,
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0x0000000000000000ULL, 200, false },
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{ 0x001ULL, 0x0ULL, 0x0000000000000000ULL,
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0x0000000000000100ULL, 200, false },
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{ 0x001ULL, 0x0ULL, 0x0000000000000000ULL,
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0x8000000000000000ULL, -1, false },
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{ 0x001ULL, 0x0ULL, 0x0000000000000000ULL,
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0x8000000000000000ULL, INT32_MAX, false },
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{ 0x001ULL, 0x0ULL, 0x0000000000000000ULL,
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0x4000000000000000ULL, -2, false },
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{ 0x001ULL, 0x0ULL, 0x0000000000000000ULL,
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0x4000000000000000ULL, INT32_MAX - 1, false },
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{ 0x8888888888888888ULL, 0x9999999999999999ULL,
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0x8000000000000000ULL, 0x9888888888888888ULL, 60, true },
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{ 0x8888888888888888ULL, 0x9999999999999999ULL,
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0x0000000000000000ULL, 0x8888888888888888ULL, 64, true },
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};
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static const test_data test_rtable[] = {
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{ 0x00000000000004C7ULL, 0x0ULL, 0x00000000000004C7ULL, 0x0ULL, 0, false },
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{ 0x0800000000000000ULL, 0x0ULL, 0x0400000000000000ULL, 0x0ULL, 1, false },
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{ 0x0800000000000000ULL, 0x0ULL, 0x0200000000000000ULL, 0x0ULL, 2, false },
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{ 0x0800000000000000ULL, 0x0ULL, 0x0008000000000000ULL, 0x0ULL, 8, false },
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{ 0x0800000000000000ULL, 0x0ULL, 0x0000080000000000ULL, 0x0ULL, 16, false },
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{ 0x0800000000000000ULL, 0x0ULL, 0x0000000008000000ULL, 0x0ULL, 32, false },
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{ 0x8000000000000000ULL, 0x0ULL, 0x0000000000000001ULL, 0x0ULL, 63, false },
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{ 0x8000000000000000ULL, 0x0ULL, 0x0000000000000000ULL, 0x0ULL, 64, false },
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{ 0x0000000000000000ULL, 0x8000000000000000ULL,
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0x0000000000000000ULL, 0x8000000000000000ULL, 128, false },
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{ 0x0000000000000000ULL, 0x8000000000000000ULL,
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0x0080000000000000ULL, 0x0000000000000000ULL, 200, false },
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{ 0x0000000000000000ULL, 0x0000000000000000ULL,
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0x0000000000000000ULL, 0x0000000000000000ULL, 200, false },
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{ 0x0000000000000000ULL, 0x8000000000000000ULL,
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0x0000000000000000ULL, 0x0000000000000080ULL, -200, false },
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{ 0x8000000000000000ULL, 0x8000000000000000ULL,
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0x0000000080000000ULL, 0x0000000080000000ULL, 32, false },
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{ 0x0800000000000000ULL, 0x0800000000000000ULL,
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0x0800000000000000ULL, 0x0000000000000000ULL, 64, false },
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{ 0x0800000000000000ULL, 0x0800000000000000ULL,
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0x0008000000000000ULL, 0x0000000000000000ULL, 72, false },
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{ 0x8000000000000000ULL, 0x8000000000000000ULL,
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0x0000000000000001ULL, 0x0000000000000000ULL, 127, false },
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{ 0x0000000000000000ULL, 0x8000000000000000ULL,
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0x0000000000000001ULL, 0x0000000000000000ULL, -1, false },
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{ 0x0000000000000000ULL, 0x8000000000000000ULL,
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0x0000000000000002ULL, 0x0000000000000000ULL, -2, false },
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};
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static void test_lshift(void)
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{
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int i;
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for (i = 0; i < ARRAY_SIZE(test_ltable); ++i) {
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bool overflow = false;
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test_data tmp = test_ltable[i];
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ulshift(&tmp.low, &tmp.high, tmp.shift, &overflow);
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g_assert_cmpuint(tmp.low, ==, tmp.rlow);
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g_assert_cmpuint(tmp.high, ==, tmp.rhigh);
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g_assert_cmpuint(tmp.overflow, ==, overflow);
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}
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}
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static void test_rshift(void)
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{
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int i;
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for (i = 0; i < ARRAY_SIZE(test_rtable); ++i) {
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test_data tmp = test_rtable[i];
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urshift(&tmp.low, &tmp.high, tmp.shift);
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g_assert_cmpuint(tmp.low, ==, tmp.rlow);
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g_assert_cmpuint(tmp.high, ==, tmp.rhigh);
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}
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}
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int main(int argc, char **argv)
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{
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g_test_init(&argc, &argv, NULL);
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g_test_add_func("/host-utils/test_lshift", test_lshift);
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g_test_add_func("/host-utils/test_rshift", test_rshift);
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return g_test_run();
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}
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