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WL#5105, ptr_cmp optimised on Solaris, more efficient to use memcmp on Solaris than native impl.

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This commit is contained in:
Mikael Ronstrom 2009-09-23 15:15:35 +02:00
parent 3df9e7358e
commit a51280725c
1 changed files with 24 additions and 0 deletions
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24
mysys/ptr_cmp.c
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@ -22,16 +22,39 @@
#include "mysys_priv.h"
#include <myisampack.h>
#ifdef UNIV_SOLARIS
/*
* On Solaris, memcmp() is normally faster than the unrolled ptr_compare_N
* functions, as memcmp() is usually a platform-specific implementation
* written in assembler, provided in /usr/lib/libc/libc_hwcap*.so.1.
* This implementation is also usually faster than the built-in memcmp
* supplied by GCC, so it is recommended to build with "-fno-builtin-memcmp"
* in CFLAGS if building with GCC on Solaris.
*/
#include <string.h>
static int native_compare(size_t *length, unsigned char **a, unsigned char **b)
{
return memcmp(*a, *b, *length);
}
#else /* UNIV_SOLARIS */
static int ptr_compare(size_t *compare_length, uchar **a, uchar **b);
static int ptr_compare_0(size_t *compare_length, uchar **a, uchar **b);
static int ptr_compare_1(size_t *compare_length, uchar **a, uchar **b);
static int ptr_compare_2(size_t *compare_length, uchar **a, uchar **b);
static int ptr_compare_3(size_t *compare_length, uchar **a, uchar **b);
#endif /* UNIV_SOLARIS */
/* Get a pointer to a optimal byte-compare function for a given size */
qsort2_cmp get_ptr_compare (size_t size)
{
#ifdef UNIV_SOLARIS
return (qsort2_cmp) native_compare;
#else
if (size < 4)
return (qsort2_cmp) ptr_compare;
switch (size & 3) {
@ -41,6 +64,7 @@ qsort2_cmp get_ptr_compare (size_t size)
case 3: return (qsort2_cmp) ptr_compare_3;
}
return 0; /* Impossible */
#endif /* UNIV_SOLARIS */
}