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migration/xbzrle: Use i386 host/cpuinfo.h

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Perform the function selection once, and only if CONFIG_AVX512_OPT
is enabled.  Centralize the selection to xbzrle.c, instead of
spreading the init across 3 files.

Remove xbzrle-bench.c.  The benefit of being able to benchmark
the different implementations is less important than not peeking
into the internals of the implementation.

Reviewed-by: Alex Bennée <alex.bennee@linaro.org>
Reviewed-by: Juan Quintela <quintela@redhat.com>
Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
This commit is contained in:
Richard Henderson 2023-05-17 20:00:30 -07:00
parent 1b48d0abdf
commit 7ba7db9fa1
6 changed files with 39 additions and 550 deletions
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26
migration/xbzrle.c
View file

@ -17,8 +17,9 @@
#if defined(CONFIG_AVX512BW_OPT)
#include <immintrin.h>
#include "host/cpuinfo.h"
int __attribute__((target("avx512bw")))
static int __attribute__((target("avx512bw")))
xbzrle_encode_buffer_avx512(uint8_t *old_buf, uint8_t *new_buf, int slen,
uint8_t *dst, int dlen)
{
@ -135,6 +136,29 @@ xbzrle_encode_buffer_avx512(uint8_t *old_buf, uint8_t *new_buf, int slen,
}
return d;
}
static int xbzrle_encode_buffer_int(uint8_t *old_buf, uint8_t *new_buf,
int slen, uint8_t *dst, int dlen);
static int (*accel_func)(uint8_t *, uint8_t *, int, uint8_t *, int);
static void __attribute__((constructor)) init_accel(void)
{
unsigned info = cpuinfo_init();
if (info & CPUINFO_AVX512BW) {
accel_func = xbzrle_encode_buffer_avx512;
} else {
accel_func = xbzrle_encode_buffer_int;
}
}
int xbzrle_encode_buffer(uint8_t *old_buf, uint8_t *new_buf, int slen,
uint8_t *dst, int dlen)
{
return accel_func(old_buf, new_buf, slen, dst, dlen);
}
#define xbzrle_encode_buffer xbzrle_encode_buffer_int
#endif
/*