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Simplify RTREE_HEIGHT_MAX definition.

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Use 1U rather than ZU(1) in macro definitions, so that the preprocessor
can evaluate the resulting expressions.
This commit is contained in:
Jason Evans 2016-04-06 13:05:21 -07:00
parent 245ae6036c
commit 667eca2ac2
1 changed files with 4 additions and 29 deletions
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33
include/jemalloc/internal/rtree.h
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@ -15,35 +15,10 @@ typedef struct rtree_s rtree_t;
* machine address width.
*/
#define LG_RTREE_BITS_PER_LEVEL 4
#define RTREE_BITS_PER_LEVEL (ZU(1) << LG_RTREE_BITS_PER_LEVEL)
/*
* Avoid math in RTREE_HEIGHT_MAX definition so that it can be used in cpp
* conditionals. The following defininitions are precomputed equivalents to:
*
* #define RTREE_HEIGHT_MAX \
* ((ZU(1) << (LG_SIZEOF_PTR+3)) / RTREE_BITS_PER_LEVEL)
*/
#if LG_RTREE_BITS_PER_LEVEL == 2
# if LG_SIZEOF_PTR == 3
# define RTREE_HEIGHT_MAX 16
# elif LG_SIZEOF_PTR == 2
# define RTREE_HEIGHT_MAX 8
# endif
#elif LG_RTREE_BITS_PER_LEVEL == 3
# if LG_SIZEOF_PTR == 3
# define RTREE_HEIGHT_MAX 8
# elif LG_SIZEOF_PTR == 2
# define RTREE_HEIGHT_MAX 4
# endif
#elif LG_RTREE_BITS_PER_LEVEL == 4
# if LG_SIZEOF_PTR == 3
# define RTREE_HEIGHT_MAX 4
# elif LG_SIZEOF_PTR == 2
# define RTREE_HEIGHT_MAX 2
# endif
#else
# error Unsupported LG_RTREE_BITS_PER_LEVEL
#endif
#define RTREE_BITS_PER_LEVEL (1U << LG_RTREE_BITS_PER_LEVEL)
/* Maximum rtree height. */
#define RTREE_HEIGHT_MAX \
((1U << (LG_SIZEOF_PTR+3)) / RTREE_BITS_PER_LEVEL)
/* Used for two-stage lock-free node initialization. */
#define RTREE_NODE_INITIALIZING ((rtree_node_elm_t *)0x1)