tests: Add test-bitops.c with some sextract tests

Add some simple test cases for the new sextract32
and sextract64 functions.

Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
Reviewed-by: Richard Henderson <rth@twiddle.net>
Message-id: 1372419632-5521-3-git-send-email-peter.maydell@linaro.org
Signed-off-by: Anthony Liguori <aliguori@us.ibm.com>

tests/Makefile

@@ -47,6 +47,7 @@ gcov-files-test-mul64-y = util/host-utils.c
 check-unit-y += tests/test-int128$(EXESUF)
 # all code tested by test-int128 is inside int128.h
 gcov-files-test-int128-y =
+check-unit-y += tests/test-bitops$(EXESUF)
 
 check-block-$(CONFIG_POSIX) += tests/qemu-iotests-quick.sh
 
@@ -125,6 +126,7 @@ 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) libqemuutil.a libqemustub.a
 
 tests/test-mul64$(EXESUF): tests/test-mul64.o libqemuutil.a
+tests/test-bitops$(EXESUF): tests/test-bitops.o libqemuutil.a
 
 libqos-obj-y = tests/libqos/pci.o tests/libqos/fw_cfg.o
 libqos-obj-y += tests/libqos/i2c.o

tests/test-bitops.c

@@ -0,0 +1,75 @@
+/*
+ * Test bitops routines
+ *
+ * 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 <glib.h>
+#include <stdint.h>
+#include "qemu/bitops.h"
+
+typedef struct {
+    uint32_t value;
+    int start;
+    int length;
+    int32_t result;
+} S32Test;
+
+typedef struct {
+    uint64_t value;
+    int start;
+    int length;
+    int64_t result;
+} S64Test;
+
+static const S32Test test_s32_data[] = {
+    { 0x38463983, 4, 4, -8 },
+    { 0x38463983, 12, 8, 0x63 },
+    { 0x38463983, 0, 32, 0x38463983 },
+};
+
+static const S64Test test_s64_data[] = {
+    { 0x8459826734967223, 60, 4, -8 },
+    { 0x8459826734967223, 0, 64, 0x8459826734967223 },
+};
+
+static void test_sextract32(void)
+{
+    int i;
+
+    for (i = 0; i < ARRAY_SIZE(test_s32_data); i++) {
+        const S32Test *test = &test_s32_data[i];
+        int32_t r = sextract32(test->value, test->start, test->length);
+
+        g_assert_cmpint(r, ==, test->result);
+    }
+}
+
+static void test_sextract64(void)
+{
+    int i;
+
+    for (i = 0; i < ARRAY_SIZE(test_s32_data); i++) {
+        const S32Test *test = &test_s32_data[i];
+        int64_t r = sextract64(test->value, test->start, test->length);
+
+        g_assert_cmpint(r, ==, test->result);
+    }
+
+    for (i = 0; i < ARRAY_SIZE(test_s64_data); i++) {
+        const S64Test *test = &test_s64_data[i];
+        int64_t r = sextract64(test->value, test->start, test->length);
+
+        g_assert_cmpint(r, ==, test->result);
+    }
+}
+
+int main(int argc, char **argv)
+{
+    g_test_init(&argc, &argv, NULL);
+    g_test_add_func("/bitops/sextract32", test_sextract32);
+    g_test_add_func("/bitops/sextract64", test_sextract64);
+    return g_test_run();
+}