From f539fbe33753fb1549e28c56225d0ab7a8cb0669 Mon Sep 17 00:00:00 2001 From: Jose Ricardo Ziviani Date: Tue, 10 Jan 2017 00:10:09 -0200 Subject: host-utils: Implement unsigned quadword left/right shift and unit tests 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 Reviewed-by: Eric Blake [dwg: Added test-shift128 to .gitignore] Signed-off-by: David Gibson --- tests/test-shift128.c | 139 ++++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 139 insertions(+) create mode 100644 tests/test-shift128.c (limited to 'tests/test-shift128.c') diff --git a/tests/test-shift128.c b/tests/test-shift128.c new file mode 100644 index 0000000000..f3ff736e5c --- /dev/null +++ b/tests/test-shift128.c @@ -0,0 +1,139 @@ +/* + * 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(); +} -- cgit v1.2.1