}
/*
- * Macro to determine if value is a power of 2
+ * Wrapper to determine if value is a power of 2
*/
-#define ISP2(x) (((x) & ((x) - 1)) == 0)
-
template<typename T>
constexpr inline bool isp2(T x) {
return (x & (x - 1)) == 0;
}
/*
- * Macros for various sorts of alignment and rounding. The "align" must
+ * Wrappers for various sorts of alignment and rounding. The "align" must
* be a power of 2. Often times it is a block, sector, or page.
*/
/*
* return x rounded down to an align boundary
- * eg, P2ALIGN(1200, 1024) == 1024 (1*align)
- * eg, P2ALIGN(1024, 1024) == 1024 (1*align)
- * eg, P2ALIGN(0x1234, 0x100) == 0x1200 (0x12*align)
- * eg, P2ALIGN(0x5600, 0x100) == 0x5600 (0x56*align)
+ * eg, p2align(1200, 1024) == 1024 (1*align)
+ * eg, p2align(1024, 1024) == 1024 (1*align)
+ * eg, p2align(0x1234, 0x100) == 0x1200 (0x12*align)
+ * eg, p2align(0x5600, 0x100) == 0x5600 (0x56*align)
*/
-#define P2ALIGN(x, align) ((x) & -(align))
-
template<typename T, typename U>
constexpr inline std::make_unsigned_t<std::common_type_t<T, U>> p2align(T x, U align) {
return x & -align;
/*
* return x % (mod) align
- * eg, P2PHASE(0x1234, 0x100) == 0x34 (x-0x12*align)
- * eg, P2PHASE(0x5600, 0x100) == 0x00 (x-0x56*align)
+ * eg, p2phase(0x1234, 0x100) == 0x34 (x-0x12*align)
+ * eg, p2phase(0x5600, 0x100) == 0x00 (x-0x56*align)
*/
-#define P2PHASE(x, align) ((x) & ((align) - 1))
-
template<typename T, typename U>
constexpr inline std::make_unsigned_t<std::common_type_t<T, U>> p2phase(T x, U align) {
return x & (align - 1);
/*
* return how much space is left in this block (but if it's perfectly
* aligned, return 0).
- * eg, P2NPHASE(0x1234, 0x100) == 0xcc (0x13*align-x)
- * eg, P2NPHASE(0x5600, 0x100) == 0x00 (0x56*align-x)
+ * eg, p2nphase(0x1234, 0x100) == 0xcc (0x13*align-x)
+ * eg, p2nphase(0x5600, 0x100) == 0x00 (0x56*align-x)
*/
-#define P2NPHASE(x, align) (-(x) & ((align) - 1))
-
template<typename T, typename U>
constexpr inline std::make_unsigned_t<std::common_type_t<T, U>> p2nphase(T x, U align) {
return -x & (align - 1);
/*
* return x rounded up to an align boundary
- * eg, P2ROUNDUP(0x1234, 0x100) == 0x1300 (0x13*align)
- * eg, P2ROUNDUP(0x5600, 0x100) == 0x5600 (0x56*align)
+ * eg, p2roundup(0x1234, 0x100) == 0x1300 (0x13*align)
+ * eg, p2roundup(0x5600, 0x100) == 0x5600 (0x56*align)
*/
-#define P2ROUNDUP(x, align) (-(-(x) & -(align)))
-
template<typename T, typename U>
constexpr inline std::make_unsigned_t<std::common_type_t<T, U>> p2roundup(T x, U align) {
return (-(-(x) & -(align)));
}
TEST(intarith, p2family) {
- ASSERT_TRUE(ISP2(0x100));
- ASSERT_FALSE(ISP2(0x1234));
+ ASSERT_TRUE(isp2(0x100));
+ ASSERT_FALSE(isp2(0x1234));
- ASSERT_EQ(1024, P2ALIGN(1200, 1024));
- ASSERT_EQ(1024, P2ALIGN(1024, 1024));
- ASSERT_EQ(0x1200, P2ALIGN(0x1234, 0x100));
- ASSERT_EQ(0x5600, P2ALIGN(0x5600, 0x100));
+ ASSERT_EQ(1024, p2align(1200, 1024));
+ ASSERT_EQ(1024, p2align(1024, 1024));
+ ASSERT_EQ(0x1200, p2align(0x1234, 0x100));
+ ASSERT_EQ(0x5600, p2align(0x5600, 0x100));
- ASSERT_EQ(0x34, P2PHASE(0x1234, 0x100));
- ASSERT_EQ(0x00, P2PHASE(0x5600, 0x100));
+ ASSERT_EQ(0x34, p2phase(0x1234, 0x100));
+ ASSERT_EQ(0x00, p2phase(0x5600, 0x100));
- ASSERT_EQ(0xcc, P2NPHASE(0x1234, 0x100));
- ASSERT_EQ(0x00, P2NPHASE(0x5600, 0x100));
+ ASSERT_EQ(0xcc, p2nphase(0x1234, 0x100));
+ ASSERT_EQ(0x00, p2nphase(0x5600, 0x100));
- ASSERT_EQ(0x1300, P2ROUNDUP(0x1234, 0x100));
- ASSERT_EQ(0x5600, P2ROUNDUP(0x5600, 0x100));
+ ASSERT_EQ(0x1300, p2roundup(0x1234, 0x100));
+ ASSERT_EQ(0x5600, p2roundup(0x5600, 0x100));
}