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util: Generate multiple versions of spdk_u32log2

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Generate multiple versions for various architectures automatically.

Fixes issue #713

Change-Id: I757a1d05e54c938b66dd5b2ec255ad960bb89945
Signed-off-by: Ben Walker <benjamin.walker@intel.com>
Reviewed-on: https://review.gerrithub.io/c/spdk/spdk/+/463550
Tested-by: SPDK CI Jenkins <sys_sgci@intel.com>
Reviewed-by: Jim Harris <james.r.harris@intel.com>
Reviewed-by: Changpeng Liu <changpeng.liu@intel.com>
This commit is contained in:
Ben Walker 2019-07-29 14:58:28 -07:00 committed by Jim Harris
parent 236dbd9550
commit de03082191
1 changed files with 12 additions and 0 deletions
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12
include/spdk/util.h
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@ -57,6 +57,12 @@ extern "C" {
/* Ceiling division of unsigned integers */ /* Ceiling division of unsigned integers */
#define SPDK_CEIL_DIV(x,y) (((x)+(y)-1)/(y)) #define SPDK_CEIL_DIV(x,y) (((x)+(y)-1)/(y))
/* The following will automatically generate several version of
* this function, targeted at different architectures. This
* is only supported by GCC 6 or newer. */
#if defined(__GNUC__) && __GNUC__ >= 6 && !defined(__clang__)
__attribute__((target_clones("bmi", "arch=core2", "arch=atom", "default")))
#endif
static inline uint32_t static inline uint32_t
spdk_u32log2(uint32_t x) spdk_u32log2(uint32_t x)
{ {
@ -73,6 +79,12 @@ spdk_align32pow2(uint32_t x)
return 1u << (1 + spdk_u32log2(x - 1)); return 1u << (1 + spdk_u32log2(x - 1));
} }
/* The following will automatically generate several version of
* this function, targeted at different architectures. This
* is only supported by GCC 6 or newer. */
#if defined(__GNUC__) && __GNUC__ >= 6 && !defined(__clang__)
__attribute__((target_clones("bmi", "arch=core2", "arch=atom", "default")))
#endif
static inline uint64_t static inline uint64_t
spdk_u64log2(uint64_t x) spdk_u64log2(uint64_t x)
{ {