Added round_pow2 function for rounding integer values up to power of 2

CHANGELOG

@@ -4,6 +4,7 @@
 
 === 1.0.32 ===
 * Added realloc_aligned function.
+* Added round_pow2 function for rounding integer values up to power of 2.
 
 === 1.0.31 ===
 * Fixed several issues reported by PVS Studio static analyzer.

include/lsp-plug.in/common/bits.h

@@ -58,5 +58,20 @@ namespace lsp
     #endif
 #undef LSP_PLUG_IN_COMMON_BITS_IMPL
 
+namespace lsp
+{
+    /**
+     * Round the integer value up to power of 2
+     * @tparam T integer value
+     * @param value value to round
+     * @return rounded value
+     */
+    template <class T>
+    T round_pow2(T value)
+    {
+        T rounded   = 1 << int_log2(value);
+        return (rounded == value) ? rounded : rounded << 1;
+    }
+} /* namespace lsp */
 
 #endif /* LSP_PLUG_IN_COMMON_BITS_H_ */

src/test/utest/bits.cpp

@@ -72,6 +72,17 @@ UTEST_BEGIN("common", bits)
             }
         }
 
+    void test_pow2_rounding()
+    {
+        uint32_t x = 0x100;
+
+        printf("Testing round_pow2...\n");
+
+        UTEST_ASSERT(round_pow2(x) == x);
+        for (uint32_t i = 1; i<=x; ++i)
+            UTEST_ASSERT(round_pow2(x + i) == (x << 1));
+    }
+
     UTEST_MAIN
     {
         test_reverse_bits<uint8_t>("reverse_bits u8");
@@ -91,6 +102,8 @@ UTEST_BEGIN("common", bits)
         test_int_log2<int32_t>("int_log2 i32");
         test_int_log2<uint64_t>("int_log2 u64");
         test_int_log2<int64_t>("int_log2 i64");
+
+        test_pow2_rounding();
     }
 
 UTEST_END;