From f539fbe33753fb1549e28c56225d0ab7a8cb0669 Mon Sep 17 00:00:00 2001 From: Jose Ricardo Ziviani Date: Tue, 10 Jan 2017 00:10:09 -0200 Subject: [PATCH] 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 --- include/qemu/host-utils.h | 27 ++++++++ tests/.gitignore | 1 + tests/Makefile.include | 5 +- tests/test-shift128.c | 139 ++++++++++++++++++++++++++++++++++++++ util/host-utils.c | 64 ++++++++++++++++++ 5 files changed, 235 insertions(+), 1 deletion(-) create mode 100644 tests/test-shift128.c diff --git a/include/qemu/host-utils.h b/include/qemu/host-utils.h index 96288d0bcef..a38be422531 100644 --- a/include/qemu/host-utils.h +++ b/include/qemu/host-utils.h @@ -513,4 +513,31 @@ static inline uint64_t pow2ceil(uint64_t value) return 1ULL << (64 - nlz); } +/** + * urshift - 128-bit Unsigned Right Shift. + * @plow: in/out - lower 64-bit integer. + * @phigh: in/out - higher 64-bit integer. + * @shift: in - bytes to shift, between 0 and 127. + * + * Result is zero-extended and stored in plow/phigh, which are + * input/output variables. Shift values outside the range will + * be mod to 128. In other words, the caller is responsible to + * verify/assert both the shift range and plow/phigh pointers. + */ +void urshift(uint64_t *plow, uint64_t *phigh, int32_t shift); + +/** + * ulshift - 128-bit Unsigned Left Shift. + * @plow: in/out - lower 64-bit integer. + * @phigh: in/out - higher 64-bit integer. + * @shift: in - bytes to shift, between 0 and 127. + * @overflow: out - true if any 1-bit is shifted out. + * + * Result is zero-extended and stored in plow/phigh, which are + * input/output variables. Shift values outside the range will + * be mod to 128. In other words, the caller is responsible to + * verify/assert both the shift range and plow/phigh pointers. + */ +void ulshift(uint64_t *plow, uint64_t *phigh, int32_t shift, bool *overflow); + #endif diff --git a/tests/.gitignore b/tests/.gitignore index 7357d0a0d4a..dc37519421e 100644 --- a/tests/.gitignore +++ b/tests/.gitignore @@ -69,6 +69,7 @@ test-qmp-marshal.c test-qobject-output-visitor test-rcu-list test-replication +test-shift128 test-string-input-visitor test-string-output-visitor test-thread-pool diff --git a/tests/Makefile.include b/tests/Makefile.include index c35fa751f27..1f6b732d135 100644 --- a/tests/Makefile.include +++ b/tests/Makefile.include @@ -65,6 +65,8 @@ check-unit-$(CONFIG_POSIX) += tests/test-vmstate$(EXESUF) endif check-unit-y += tests/test-cutils$(EXESUF) gcov-files-test-cutils-y += util/cutils.c +check-unit-y += tests/test-shift128$(EXESUF) +gcov-files-test-shift128-y = util/host-utils.c check-unit-y += tests/test-mul64$(EXESUF) gcov-files-test-mul64-y = util/host-utils.c check-unit-y += tests/test-int128$(EXESUF) @@ -487,7 +489,7 @@ test-obj-y = tests/check-qint.o tests/check-qstring.o tests/check-qdict.o \ tests/test-x86-cpuid.o tests/test-mul64.o tests/test-int128.o \ tests/test-opts-visitor.o tests/test-qmp-event.o \ tests/rcutorture.o tests/test-rcu-list.o \ - tests/test-qdist.o \ + tests/test-qdist.o tests/test-shift128.o \ tests/test-qht.o tests/qht-bench.o tests/test-qht-par.o \ tests/atomic_add-bench.o @@ -596,6 +598,7 @@ tests/test-qmp-commands$(EXESUF): tests/test-qmp-commands.o tests/test-qmp-marsh tests/test-visitor-serialization$(EXESUF): tests/test-visitor-serialization.o $(test-qapi-obj-y) tests/test-opts-visitor$(EXESUF): tests/test-opts-visitor.o $(test-qapi-obj-y) +tests/test-shift128$(EXESUF): tests/test-shift128.o $(test-util-obj-y) tests/test-mul64$(EXESUF): tests/test-mul64.o $(test-util-obj-y) tests/test-bitops$(EXESUF): tests/test-bitops.o $(test-util-obj-y) tests/test-bitcnt$(EXESUF): tests/test-bitcnt.o $(test-util-obj-y) diff --git a/tests/test-shift128.c b/tests/test-shift128.c new file mode 100644 index 00000000000..f3ff736e5c5 --- /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(); +} diff --git a/util/host-utils.c b/util/host-utils.c index 34952622337..7b9322071d1 100644 --- a/util/host-utils.c +++ b/util/host-utils.c @@ -161,3 +161,67 @@ int divs128(int64_t *plow, int64_t *phigh, int64_t divisor) } #endif +/** + * urshift - 128-bit Unsigned Right Shift. + * @plow: in/out - lower 64-bit integer. + * @phigh: in/out - higher 64-bit integer. + * @shift: in - bytes to shift, between 0 and 127. + * + * Result is zero-extended and stored in plow/phigh, which are + * input/output variables. Shift values outside the range will + * be mod to 128. In other words, the caller is responsible to + * verify/assert both the shift range and plow/phigh pointers. + */ +void urshift(uint64_t *plow, uint64_t *phigh, int32_t shift) +{ + shift &= 127; + if (shift == 0) { + return; + } + + uint64_t h = *phigh >> (shift & 63); + if (shift >= 64) { + *plow = h; + *phigh = 0; + } else { + *plow = (*plow >> (shift & 63)) | (*phigh << (64 - (shift & 63))); + *phigh = h; + } +} + +/** + * ulshift - 128-bit Unsigned Left Shift. + * @plow: in/out - lower 64-bit integer. + * @phigh: in/out - higher 64-bit integer. + * @shift: in - bytes to shift, between 0 and 127. + * @overflow: out - true if any 1-bit is shifted out. + * + * Result is zero-extended and stored in plow/phigh, which are + * input/output variables. Shift values outside the range will + * be mod to 128. In other words, the caller is responsible to + * verify/assert both the shift range and plow/phigh pointers. + */ +void ulshift(uint64_t *plow, uint64_t *phigh, int32_t shift, bool *overflow) +{ + uint64_t low = *plow; + uint64_t high = *phigh; + + shift &= 127; + if (shift == 0) { + return; + } + + /* check if any bit will be shifted out */ + urshift(&low, &high, 128 - shift); + if (low | high) { + *overflow = true; + } + + if (shift >= 64) { + *phigh = *plow << (shift & 63); + *plow = 0; + } else { + *phigh = (*plow >> (64 - (shift & 63))) | (*phigh << (shift & 63)); + *plow = *plow << shift; + } +} -- 2.39.5