Change in coreboot[master]: tests: Add lib/libgcc-test test case

[Jakub Czapiga (Code Review)]

Jakub Czapiga has uploaded this change for review. ( https://review.coreboot.org/c/coreboot/+/56257 )

Change subject: tests: Add lib/libgcc-test test case
......................................................................

tests: Add lib/libgcc-test test case

Add tests for src/lib/libgcc.c __clzsi2() implementation. Unlike GCC
implementation, coreboot one can handle zero input.

Signed-off-by: Jakub Czapiga 
Change-Id: I3f46071d0921e8c5edc5df3c296d11c77de01c88
---
M tests/lib/Makefile.inc
A tests/lib/libgcc-test.c
2 files changed, 79 insertions(+), 0 deletions(-)

git pull ssh://review.coreboot.org:29418/coreboot refs/changes/57/56257/1

diff --git a/tests/lib/Makefile.inc b/tests/lib/Makefile.inc
index 6750353..028db73 100644
--- a/tests/lib/Makefile.inc
+++ b/tests/lib/Makefile.inc
@@ -31,6 +31,7 @@
 tests-y += spd_cache-ddr3-test
 tests-y += spd_cache-ddr4-test
 tests-y += cbmem_stage_cache-test
+tests-y += libgcc-test

string-test-srcs += tests/lib/string-test.c
 string-test-srcs += src/lib/string.c
@@ -177,3 +178,5 @@
 cbmem_stage_cache-test-cflags += -I 3rdparty/vboot/firmware/include
 cbmem_stage_cache-test-cflags += -I $(src)/commonlib/include
 cbmem_stage_cache-test-config += CONFIG_CBMEM_STAGE_CACHE=1
+
+libgcc-test-srcs += tests/lib/libgcc-test.c
diff --git a/tests/lib/libgcc-test.c b/tests/lib/libgcc-test.c
new file mode 100644
index 0000000..a35c537
--- /dev/null
+++ b/tests/lib/libgcc-test.c
@@ -0,0 +1,76 @@
+/* SPDX-License-Identifier: GPL-2.0-only */
+
+#include "../lib/libgcc.c"
+
+#include <tests/test.h>
+#include <stdlib.h>
+#include <string.h>
+
+struct {
+	u32 value;
+	int expected_output;
+} test_data[] = {
+	/* GCC documentation says, __clzsi2() has undefined result for zero as an input value,
+	   but coreboot implementation can handle this. */
+	{ .value = 0, .expected_output = 32 },
+
+	{ .value = 1, .expected_output = 31 },
+	{ .value = 2, .expected_output = 30 },
+	{ .value = 3, .expected_output = 30 },
+	{ .value = 4, .expected_output = 29 },
+	{ .value = 5, .expected_output = 29 },
+	{ .value = 6, .expected_output = 29 },
+	{ .value = 7, .expected_output = 29 },
+
+	{ .value = 0xF, .expected_output = 28 },
+	{ .value = 0x10, .expected_output = 27 },
+	{ .value = 0x25, .expected_output = 26 },
+	{ .value = 0x5D, .expected_output = 25 },
+	{ .value = 0xB7, .expected_output = 24 },
+
+	{ .value = 0x133, .expected_output = 23 },
+	{ .value = 0x3DC, .expected_output = 22 },
+	{ .value = 0x6F1, .expected_output = 21 },
+	{ .value = 0x897, .expected_output = 20 },
+
+	{ .value = 0x1FFF, .expected_output = 19 },
+	{ .value = 0x2222, .expected_output = 18 },
+	{ .value = 0x7BAD, .expected_output = 17 },
+	{ .value = 0xE708, .expected_output = 16 },
+
+	{ .value = 0x1DABD, .expected_output = 15 },
+	{ .value = 0x29876, .expected_output = 14 },
+	{ .value = 0x56665, .expected_output = 13 },
+	{ .value = 0xABCDE, .expected_output = 12 },
+
+	{ .value = 0x18365F, .expected_output = 11 },
+	{ .value = 0x3D0115, .expected_output = 10 },
+	{ .value = 0x4B07EB, .expected_output = 9 },
+	{ .value = 0xCCC74D, .expected_output = 8 },
+
+	{ .value = 0x17933ED, .expected_output = 7 },
+	{ .value = 0x2B00071, .expected_output = 6 },
+	{ .value = 0x4D4C1A5, .expected_output = 5 },
+	{ .value = 0xAD01FFF, .expected_output = 4 },
+
+	{ .value = 0x1C5A8057, .expected_output = 3 },
+	{ .value = 0x35AB23C3, .expected_output = 2 },
+	{ .value = 0x7017013B, .expected_output = 1 },
+	{ .value = 0xAD01EB15, .expected_output = 0 },
+};
+
+void test_clzsi2_with_data(void **state)
+{
+	for (int i = 0; i < ARRAY_SIZE(test_data); ++i)
+		assert_int_equal(test_data[i].expected_output, __clzsi2(test_data[i].value));
+}
+
+int main(void)
+{
+	const struct CMUnitTest tests[] = {
+		cmocka_unit_test(test_clzsi2_with_data),
+	};
+
+
+	return cmocka_run_group_tests(tests, NULL, NULL);
+}