mirror of
https://github.com/xemu-project/xemu.git
synced 2024-12-05 10:16:50 +00:00
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>
140 lines
5.5 KiB
C
140 lines
5.5 KiB
C
/*
|
|
* Test unsigned left and right shift
|
|
*
|
|
* This work is licensed under the terms of the GNU LGPL, version 2 or later.
|
|
* See the COPYING.LIB file in the top-level directory.
|
|
*
|
|
*/
|
|
|
|
#include "qemu/osdep.h"
|
|
#include "qemu/host-utils.h"
|
|
|
|
typedef struct {
|
|
uint64_t low;
|
|
uint64_t high;
|
|
uint64_t rlow;
|
|
uint64_t rhigh;
|
|
int32_t shift;
|
|
bool overflow;
|
|
} test_data;
|
|
|
|
static const test_data test_ltable[] = {
|
|
{ 0x4C7ULL, 0x0ULL, 0x00000000000004C7ULL,
|
|
0x0000000000000000ULL, 0, false },
|
|
{ 0x001ULL, 0x0ULL, 0x0000000000000002ULL,
|
|
0x0000000000000000ULL, 1, false },
|
|
{ 0x001ULL, 0x0ULL, 0x0000000000000004ULL,
|
|
0x0000000000000000ULL, 2, false },
|
|
{ 0x001ULL, 0x0ULL, 0x0000000000000010ULL,
|
|
0x0000000000000000ULL, 4, false },
|
|
{ 0x001ULL, 0x0ULL, 0x0000000000000100ULL,
|
|
0x0000000000000000ULL, 8, false },
|
|
{ 0x001ULL, 0x0ULL, 0x0000000000010000ULL,
|
|
0x0000000000000000ULL, 16, false },
|
|
{ 0x001ULL, 0x0ULL, 0x0000000080000000ULL,
|
|
0x0000000000000000ULL, 31, false },
|
|
{ 0x001ULL, 0x0ULL, 0x0000200000000000ULL,
|
|
0x0000000000000000ULL, 45, false },
|
|
{ 0x001ULL, 0x0ULL, 0x1000000000000000ULL,
|
|
0x0000000000000000ULL, 60, false },
|
|
{ 0x001ULL, 0x0ULL, 0x0000000000000000ULL,
|
|
0x0000000000000001ULL, 64, false },
|
|
{ 0x001ULL, 0x0ULL, 0x0000000000000000ULL,
|
|
0x0000000000010000ULL, 80, false },
|
|
{ 0x001ULL, 0x0ULL, 0x0000000000000000ULL,
|
|
0x8000000000000000ULL, 127, false },
|
|
{ 0x000ULL, 0x1ULL, 0x0000000000000000ULL,
|
|
0x0000000000000000ULL, 64, true },
|
|
{ 0x008ULL, 0x0ULL, 0x0000000000000000ULL,
|
|
0x0000000000000008ULL, 64, false },
|
|
{ 0x008ULL, 0x0ULL, 0x0000000000000000ULL,
|
|
0x8000000000000000ULL, 124, false },
|
|
{ 0x001ULL, 0x0ULL, 0x0000000000000000ULL,
|
|
0x4000000000000000ULL, 126, false },
|
|
{ 0x001ULL, 0x0ULL, 0x0000000000000000ULL,
|
|
0x8000000000000000ULL, 127, false },
|
|
{ 0x001ULL, 0x0ULL, 0x0000000000000001ULL,
|
|
0x0000000000000000ULL, 128, false },
|
|
{ 0x000ULL, 0x0ULL, 0x0000000000000000ULL,
|
|
0x0000000000000000ULL, 200, false },
|
|
{ 0x001ULL, 0x0ULL, 0x0000000000000000ULL,
|
|
0x0000000000000100ULL, 200, false },
|
|
{ 0x001ULL, 0x0ULL, 0x0000000000000000ULL,
|
|
0x8000000000000000ULL, -1, false },
|
|
{ 0x001ULL, 0x0ULL, 0x0000000000000000ULL,
|
|
0x8000000000000000ULL, INT32_MAX, false },
|
|
{ 0x001ULL, 0x0ULL, 0x0000000000000000ULL,
|
|
0x4000000000000000ULL, -2, false },
|
|
{ 0x001ULL, 0x0ULL, 0x0000000000000000ULL,
|
|
0x4000000000000000ULL, INT32_MAX - 1, false },
|
|
{ 0x8888888888888888ULL, 0x9999999999999999ULL,
|
|
0x8000000000000000ULL, 0x9888888888888888ULL, 60, true },
|
|
{ 0x8888888888888888ULL, 0x9999999999999999ULL,
|
|
0x0000000000000000ULL, 0x8888888888888888ULL, 64, true },
|
|
};
|
|
|
|
static const test_data test_rtable[] = {
|
|
{ 0x00000000000004C7ULL, 0x0ULL, 0x00000000000004C7ULL, 0x0ULL, 0, false },
|
|
{ 0x0800000000000000ULL, 0x0ULL, 0x0400000000000000ULL, 0x0ULL, 1, false },
|
|
{ 0x0800000000000000ULL, 0x0ULL, 0x0200000000000000ULL, 0x0ULL, 2, false },
|
|
{ 0x0800000000000000ULL, 0x0ULL, 0x0008000000000000ULL, 0x0ULL, 8, false },
|
|
{ 0x0800000000000000ULL, 0x0ULL, 0x0000080000000000ULL, 0x0ULL, 16, false },
|
|
{ 0x0800000000000000ULL, 0x0ULL, 0x0000000008000000ULL, 0x0ULL, 32, false },
|
|
{ 0x8000000000000000ULL, 0x0ULL, 0x0000000000000001ULL, 0x0ULL, 63, false },
|
|
{ 0x8000000000000000ULL, 0x0ULL, 0x0000000000000000ULL, 0x0ULL, 64, false },
|
|
{ 0x0000000000000000ULL, 0x8000000000000000ULL,
|
|
0x0000000000000000ULL, 0x8000000000000000ULL, 128, false },
|
|
{ 0x0000000000000000ULL, 0x8000000000000000ULL,
|
|
0x0080000000000000ULL, 0x0000000000000000ULL, 200, false },
|
|
{ 0x0000000000000000ULL, 0x0000000000000000ULL,
|
|
0x0000000000000000ULL, 0x0000000000000000ULL, 200, false },
|
|
{ 0x0000000000000000ULL, 0x8000000000000000ULL,
|
|
0x0000000000000000ULL, 0x0000000000000080ULL, -200, false },
|
|
{ 0x8000000000000000ULL, 0x8000000000000000ULL,
|
|
0x0000000080000000ULL, 0x0000000080000000ULL, 32, false },
|
|
{ 0x0800000000000000ULL, 0x0800000000000000ULL,
|
|
0x0800000000000000ULL, 0x0000000000000000ULL, 64, false },
|
|
{ 0x0800000000000000ULL, 0x0800000000000000ULL,
|
|
0x0008000000000000ULL, 0x0000000000000000ULL, 72, false },
|
|
{ 0x8000000000000000ULL, 0x8000000000000000ULL,
|
|
0x0000000000000001ULL, 0x0000000000000000ULL, 127, false },
|
|
{ 0x0000000000000000ULL, 0x8000000000000000ULL,
|
|
0x0000000000000001ULL, 0x0000000000000000ULL, -1, false },
|
|
{ 0x0000000000000000ULL, 0x8000000000000000ULL,
|
|
0x0000000000000002ULL, 0x0000000000000000ULL, -2, false },
|
|
};
|
|
|
|
static void test_lshift(void)
|
|
{
|
|
int i;
|
|
|
|
for (i = 0; i < ARRAY_SIZE(test_ltable); ++i) {
|
|
bool overflow = false;
|
|
test_data tmp = test_ltable[i];
|
|
ulshift(&tmp.low, &tmp.high, tmp.shift, &overflow);
|
|
g_assert_cmpuint(tmp.low, ==, tmp.rlow);
|
|
g_assert_cmpuint(tmp.high, ==, tmp.rhigh);
|
|
g_assert_cmpuint(tmp.overflow, ==, overflow);
|
|
}
|
|
}
|
|
|
|
static void test_rshift(void)
|
|
{
|
|
int i;
|
|
|
|
for (i = 0; i < ARRAY_SIZE(test_rtable); ++i) {
|
|
test_data tmp = test_rtable[i];
|
|
urshift(&tmp.low, &tmp.high, tmp.shift);
|
|
g_assert_cmpuint(tmp.low, ==, tmp.rlow);
|
|
g_assert_cmpuint(tmp.high, ==, tmp.rhigh);
|
|
}
|
|
}
|
|
|
|
int main(int argc, char **argv)
|
|
{
|
|
g_test_init(&argc, &argv, NULL);
|
|
g_test_add_func("/host-utils/test_lshift", test_lshift);
|
|
g_test_add_func("/host-utils/test_rshift", test_rshift);
|
|
return g_test_run();
|
|
}
|