macro: add generic IS_ALIGNED32() anf friends

Let's generalize (and invert) the UNALIGNED32_P() macro from the sha256
code, and let's add a test for it.

1 files changed, 53 insertions, 0 deletions

diff --git a/src/test/test-macro.c b/src/test/test-macro.c
index 001166d0dc..d4f32496b7 100644
--- a/src/test/test-macro.c
+++ b/src/test/test-macro.c
@@ -531,4 +531,57 @@ TEST(ISPOWEROF2) {
         assert_se(!ISPOWEROF2(u));
 }
 
+TEST(ALIGNED) {
+        assert_se(IS_ALIGNED16(NULL));
+        assert_se(IS_ALIGNED32(NULL));
+        assert_se(IS_ALIGNED64(NULL));
+
+        uint64_t u64;
+        uint32_t u32;
+        uint16_t u16;
+
+        assert_se(IS_ALIGNED16(&u16));
+        assert_se(IS_ALIGNED16(&u32));
+        assert_se(IS_ALIGNED16(&u64));
+        assert_se(IS_ALIGNED32(&u32));
+        assert_se(IS_ALIGNED32(&u64));
+        assert_se(IS_ALIGNED64(&u64));
+
+        _align_(32) uint8_t ua256;
+        _align_(8) uint8_t ua64;
+        _align_(4) uint8_t ua32;
+        _align_(2) uint8_t ua16;
+
+        assert_se(IS_ALIGNED16(&ua256));
+        assert_se(IS_ALIGNED32(&ua256));
+        assert_se(IS_ALIGNED64(&ua256));
+
+        assert_se(IS_ALIGNED16(&ua64));
+        assert_se(IS_ALIGNED32(&ua64));
+        assert_se(IS_ALIGNED64(&ua64));
+
+        assert_se(IS_ALIGNED16(&ua32));
+        assert_se(IS_ALIGNED32(&ua32));
+
+        assert_se(IS_ALIGNED16(&ua16));
+
+#ifdef __x86_64__
+        /* Conditionalized on x86-64, since there we know for sure that all three types are aligned to
+         * their size. Too lazy to figure it out for other archs */
+        void *p = UINT_TO_PTR(1); /* definitely not aligned */
+        assert_se(!IS_ALIGNED16(p));
+        assert_se(!IS_ALIGNED32(p));
+        assert_se(!IS_ALIGNED64(p));
+
+        assert_se(IS_ALIGNED16(ALIGN2_PTR(p)));
+        assert_se(IS_ALIGNED32(ALIGN4_PTR(p)));
+        assert_se(IS_ALIGNED64(ALIGN8_PTR(p)));
+
+        p = UINT_TO_PTR(-1); /* also definitely not aligned */
+        assert_se(!IS_ALIGNED16(p));
+        assert_se(!IS_ALIGNED32(p));
+        assert_se(!IS_ALIGNED64(p));
+#endif
+}
+
 DEFINE_TEST_MAIN(LOG_INFO);