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authortruelight <truelight@openttd.org>2007-11-06 23:21:08 +0000
committertruelight <truelight@openttd.org>2007-11-06 23:21:08 +0000
commit6104d33ef12b98bcb845f31e109aa3a6ade75318 (patch)
tree82eca1176932ff514d5c0044eb762f099ba3ae6b
parent71fa86dee73cb47ae9c40a4f0dd713a1ee39e0ff (diff)
downloadopenttd-6104d33ef12b98bcb845f31e109aa3a6ade75318.tar.xz
(svn r11387) -Codechange: changed many macros.h #defines to static inline functions (patch by skidd13, with a big tnx to SmatZ for profiling!)
-rw-r--r--src/macros.h117
1 files changed, 75 insertions, 42 deletions
diff --git a/src/macros.h b/src/macros.h
index 1982e939e..2f5a9b48f 100644
--- a/src/macros.h
+++ b/src/macros.h
@@ -8,7 +8,7 @@
/**
* Fetch n bits from x, started at bit s.
*
- * This macro can be used to fetch n bits from the value x. The
+ * This function can be used to fetch n bits from the value x. The
* s value set the startposition to read. The startposition is
* count from the LSB and starts at 0. The result starts at a
* LSB, as this isn't just an and-bitmask but also some
@@ -21,11 +21,14 @@
* @param n The number of bits to read.
* @return The selected bits, aligned to a LSB.
*/
-#define GB(x, s, n) (((x) >> (s)) & ((1U << (n)) - 1))
+template<typename T> static inline uint GB(const T x, const uint8 s, const uint8 n)
+{
+ return (x >> s) & ((1U << n) - 1);
+}
/** Set n bits from x starting at bit s to d
*
- * This macro sets n bits from x which started as bit s to the value of
+ * This function sets n bits from x which started as bit s to the value of
* d. The parameters x, s and n works the same as the parameters of
* #GB. The result is saved in x again. Unused bits in the window
* provided by n are set to 0 if the value of b isn't "big" enough.
@@ -40,7 +43,12 @@
* @param d The actually new bits to save in the defined position.
* @return The new value of x
*/
-#define SB(x, s, n, d) ((x) = ((x) & ~(((1U << (n)) - 1) << (s))) | ((d) << (s)))
+template<typename T, typename U> static inline T SB(T& x, const uint8 s, const uint8 n, const U d)
+{
+ x &= (T)(~(((1U << n) - 1) << s));
+ x |= (T)(d << s);
+ return x;
+}
/** Add i to n bits of x starting at bit s.
*
@@ -56,7 +64,13 @@
* @param i The value to add at the given startposition in the given window.
* @return The new value of x
*/
-#define AB(x, s, n, i) ((x) = ((x) & ~(((1U << (n)) - 1) << (s))) | (((x) + ((i) << (s))) & (((1U << (n)) - 1) << (s))))
+template<typename T, typename U> static inline T AB(T& x, const uint8 s, const uint8 n, const U i)
+{
+ const T tmp = (T)(((1U << n) - 1) << s);
+ x &= ~tmp;
+ x |= (T)((x + (i << s)) & tmp);
+ return x;
+}
#ifdef min
#undef min
@@ -223,23 +237,6 @@ static inline uint32 BIGMULUS(const uint32 a, const uint32 b, const uint8 shift)
return (uint32)((uint64)a * (uint64)b >> shift);
}
-
-/**
- * Checks if a value is between a window started at some base point.
- *
- * This macro checks if the value x is between the value of base
- * and base+size. If x equals base this returns true. If x equals
- * base+size this returns false.
- *
- * @param x The value to check
- * @param base The base value of the interval
- * @param size The size of the interval
- * @return True if the value is in the interval, false else.
- */
-/* OPT: optimized into an unsigned comparison */
-//#define IS_INSIDE_1D(x, base, size) ((x) >= (base) && (x) < (base) + (size))
-#define IS_INSIDE_1D(x, base, size) ( (uint)((x) - (base)) < ((uint)(size)) )
-
/**
* Checks if a bit in a value is set.
*
@@ -384,20 +381,10 @@ extern const byte _ffb_64[64];
*/
static inline int FindFirstBit2x64(int value)
{
-/*
- int i = 0;
- if ( (byte) value == 0) {
- i += 8;
- value >>= 8;
- }
- return i + FIND_FIRST_BIT(value & 0x3F);
-
-Faster ( or at least cleaner ) implementation below?
-*/
- if (GB(value, 0, 8) == 0) {
- return FIND_FIRST_BIT(GB(value, 8, 6)) + 8;
+ if ((value & 0xFF) == 0) {
+ return FIND_FIRST_BIT((value >> 8) & 0x3F) + 8;
} else {
- return FIND_FIRST_BIT(GB(value, 0, 6));
+ return FIND_FIRST_BIT(value & 0x3F);
}
}
@@ -424,7 +411,7 @@ template<typename T> static inline T KillFirstBit(T value)
*/
template<typename T> static inline uint CountBits(T value)
{
- register uint num;
+ uint num;
/* This loop is only called once for every bit set by clearing the lowest
* bit in each loop. The number of bits is therefore equal to the number of
@@ -439,6 +426,23 @@ template<typename T> static inline uint CountBits(T value)
}
/**
+ * Checks if a value is between a window started at some base point.
+ *
+ * This function checks if the value x is between the value of base
+ * and base+size. If x equals base this returns true. If x equals
+ * base+size this returns false.
+ *
+ * @param x The value to check
+ * @param base The base value of the interval
+ * @param size The size of the interval
+ * @return True if the value is in the interval, false else.
+ */
+template<typename T> static inline bool IS_INSIDE_1D(const T x, const int base, const uint size)
+{
+ return (uint)(x - base) < size;
+}
+
+/**
* Checks if a byte is in an interval.
*
* This macro returns true if a byte value is in the interval of [min, max).
@@ -496,10 +500,13 @@ template<typename T> static inline uint CountBits(T value)
*
* @param a The numerator of the fraction, see CHANCE16
* @param b The denominator of the fraction, see CHANCE16
- * @param v The given randomize-number
+ * @param r The given randomize-number
* @return True if v is less or equals (a/b)
*/
-#define CHANCE16I(a, b, v) ((uint16)(v) <= (uint16)((65536 * (a)) / (b)))
+static inline bool CHANCE16I(const uint a, const uint b, const uint32 r)
+{
+ return (uint16)r <= (uint16)((65536 * a) / b);
+}
#define for_each_bit(_i, _b) \
@@ -525,17 +532,43 @@ static inline uint16 ReadLE16Unaligned(const void* x)
/**
- * ROtate x Left/Right by n (must be >= 0)
+ * ROtate x Left by n
+ *
+ * @note Assumes a byte has 8 bits
+ * @param x The value which we want to rotate
+ * @param n The number how many we waht to rotate
+ * @return A bit rotated number
+ */
+template<typename T> static inline T ROL(const T x, const uint8 n)
+{
+ return (T)(x << n | x >> (sizeof(x) * 8 - n));
+}
+
+/**
+ * ROtate x Right by n
+ *
* @note Assumes a byte has 8 bits
+ * @param x The value which we want to rotate
+ * @param n The number how many we waht to rotate
+ * @return A bit rotated number
*/
-#define ROL(x, n) ((x) << (n) | (x) >> (sizeof(x) * 8 - (n)))
-#define ROR(x, n) ((x) >> (n) | (x) << (sizeof(x) * 8 - (n)))
+template<typename T> static inline T ROR(const T x, const uint8 n)
+{
+ return (T)(x >> n | x << (sizeof(x) * 8 - n));
+}
/**
* Return the smallest multiple of n equal or greater than x
+ *
* @note n must be a power of 2
+ * @param x The min value
+ * @param n The base of the number we are searching
+ * @return The smallest multiple of n equal or greater than x
*/
-#define ALIGN(x, n) (((x) + (n) - 1) & ~((n) - 1))
+template<typename T> static inline T ALIGN(const T x, uint n) {
+ n--;
+ return (T)((x + n) & ~(n));
+}
/** return the largest value that can be entered in a variable.
*/