util: move ALIGN/ROUND_DOWN_TO to u_math.h

These are less mesa specific than the rest of macros.h, and would be
nice to use outside of mesa.  Prep for next patch.

Signed-off-by: Rob Clark <[email protected]>
Reviewed-by: Marek Olšák <[email protected]>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/4381>

1 files changed, 46 insertions, 0 deletions

diff --git a/src/util/u_math.h b/src/util/u_math.h
index 4f2658e2897..a672486f02f 100644
--- a/src/util/u_math.h
+++ b/src/util/u_math.h
@@ -660,6 +660,52 @@ util_memcpy_cpu_to_le32(void * restrict dest, const void * restrict src, size_t
 
 
 /**
+ * Align a value up to an alignment value
+ *
+ * If \c value is not already aligned to the requested alignment value, it
+ * will be rounded up.
+ *
+ * \param value  Value to be rounded
+ * \param alignment  Alignment value to be used.  This must be a power of two.
+ *
+ * \sa ROUND_DOWN_TO()
+ */
+static inline uintptr_t
+ALIGN(uintptr_t value, int32_t alignment)
+{
+   assert(util_is_power_of_two_nonzero(alignment));
+   return (((value) + (alignment) - 1) & ~((alignment) - 1));
+}
+
+/**
+ * Like ALIGN(), but works with a non-power-of-two alignment.
+ */
+static inline uintptr_t
+ALIGN_NPOT(uintptr_t value, int32_t alignment)
+{
+   assert(alignment > 0);
+   return (value + alignment - 1) / alignment * alignment;
+}
+
+/**
+ * Align a value down to an alignment value
+ *
+ * If \c value is not already aligned to the requested alignment value, it
+ * will be rounded down.
+ *
+ * \param value  Value to be rounded
+ * \param alignment  Alignment value to be used.  This must be a power of two.
+ *
+ * \sa ALIGN()
+ */
+static inline uintptr_t
+ROUND_DOWN_TO(uintptr_t value, int32_t alignment)
+{
+   assert(util_is_power_of_two_nonzero(alignment));
+   return ((value) & ~(alignment - 1));
+}
+
+/**
  * Align a value, only works pot alignemnts.
  */
 static inline int