migration/xbzrle: Shuffle function order
Place the CONFIG_AVX512BW_OPT block at the top, which will aid function selection in the next patch. Reviewed-by: Alex Bennée <alex.bennee@linaro.org> Reviewed-by: Juan Quintela <quintela@redhat.com> Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
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Richard Henderson
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51f4d916b5
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1b48d0abdf
@ -15,6 +15,128 @@
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#include "qemu/host-utils.h"
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#include "xbzrle.h"
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#if defined(CONFIG_AVX512BW_OPT)
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#include <immintrin.h>
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int __attribute__((target("avx512bw")))
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xbzrle_encode_buffer_avx512(uint8_t *old_buf, uint8_t *new_buf, int slen,
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uint8_t *dst, int dlen)
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{
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uint32_t zrun_len = 0, nzrun_len = 0;
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int d = 0, i = 0, num = 0;
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uint8_t *nzrun_start = NULL;
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/* add 1 to include residual part in main loop */
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uint32_t count512s = (slen >> 6) + 1;
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/* countResidual is tail of data, i.e., countResidual = slen % 64 */
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uint32_t count_residual = slen & 0b111111;
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bool never_same = true;
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uint64_t mask_residual = 1;
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mask_residual <<= count_residual;
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mask_residual -= 1;
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__m512i r = _mm512_set1_epi32(0);
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while (count512s) {
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int bytes_to_check = 64;
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uint64_t mask = 0xffffffffffffffff;
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if (count512s == 1) {
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bytes_to_check = count_residual;
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mask = mask_residual;
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}
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__m512i old_data = _mm512_mask_loadu_epi8(r,
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mask, old_buf + i);
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__m512i new_data = _mm512_mask_loadu_epi8(r,
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mask, new_buf + i);
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uint64_t comp = _mm512_cmpeq_epi8_mask(old_data, new_data);
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count512s--;
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bool is_same = (comp & 0x1);
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while (bytes_to_check) {
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if (d + 2 > dlen) {
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return -1;
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}
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if (is_same) {
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if (nzrun_len) {
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d += uleb128_encode_small(dst + d, nzrun_len);
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if (d + nzrun_len > dlen) {
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return -1;
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}
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nzrun_start = new_buf + i - nzrun_len;
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memcpy(dst + d, nzrun_start, nzrun_len);
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d += nzrun_len;
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nzrun_len = 0;
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}
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/* 64 data at a time for speed */
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if (count512s && (comp == 0xffffffffffffffff)) {
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i += 64;
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zrun_len += 64;
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break;
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}
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never_same = false;
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num = ctz64(~comp);
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num = (num < bytes_to_check) ? num : bytes_to_check;
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zrun_len += num;
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bytes_to_check -= num;
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comp >>= num;
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i += num;
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if (bytes_to_check) {
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/* still has different data after same data */
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d += uleb128_encode_small(dst + d, zrun_len);
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zrun_len = 0;
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} else {
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break;
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}
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}
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if (never_same || zrun_len) {
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/*
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* never_same only acts if
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* data begins with diff in first count512s
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*/
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d += uleb128_encode_small(dst + d, zrun_len);
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zrun_len = 0;
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never_same = false;
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}
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/* has diff, 64 data at a time for speed */
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if ((bytes_to_check == 64) && (comp == 0x0)) {
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i += 64;
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nzrun_len += 64;
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break;
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}
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num = ctz64(comp);
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num = (num < bytes_to_check) ? num : bytes_to_check;
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nzrun_len += num;
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bytes_to_check -= num;
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comp >>= num;
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i += num;
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if (bytes_to_check) {
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/* mask like 111000 */
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d += uleb128_encode_small(dst + d, nzrun_len);
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/* overflow */
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if (d + nzrun_len > dlen) {
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return -1;
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}
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nzrun_start = new_buf + i - nzrun_len;
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memcpy(dst + d, nzrun_start, nzrun_len);
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d += nzrun_len;
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nzrun_len = 0;
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is_same = true;
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}
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}
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}
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if (nzrun_len != 0) {
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d += uleb128_encode_small(dst + d, nzrun_len);
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/* overflow */
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if (d + nzrun_len > dlen) {
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return -1;
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}
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nzrun_start = new_buf + i - nzrun_len;
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memcpy(dst + d, nzrun_start, nzrun_len);
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d += nzrun_len;
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}
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return d;
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}
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#endif
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/*
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page = zrun nzrun
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| zrun nzrun page
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@ -175,125 +297,3 @@ int xbzrle_decode_buffer(uint8_t *src, int slen, uint8_t *dst, int dlen)
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return d;
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}
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#if defined(CONFIG_AVX512BW_OPT)
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#include <immintrin.h>
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int __attribute__((target("avx512bw")))
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xbzrle_encode_buffer_avx512(uint8_t *old_buf, uint8_t *new_buf, int slen,
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uint8_t *dst, int dlen)
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{
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uint32_t zrun_len = 0, nzrun_len = 0;
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int d = 0, i = 0, num = 0;
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uint8_t *nzrun_start = NULL;
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/* add 1 to include residual part in main loop */
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uint32_t count512s = (slen >> 6) + 1;
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/* countResidual is tail of data, i.e., countResidual = slen % 64 */
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uint32_t count_residual = slen & 0b111111;
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bool never_same = true;
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uint64_t mask_residual = 1;
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mask_residual <<= count_residual;
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mask_residual -= 1;
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__m512i r = _mm512_set1_epi32(0);
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while (count512s) {
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int bytes_to_check = 64;
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uint64_t mask = 0xffffffffffffffff;
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if (count512s == 1) {
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bytes_to_check = count_residual;
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mask = mask_residual;
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}
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__m512i old_data = _mm512_mask_loadu_epi8(r,
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mask, old_buf + i);
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__m512i new_data = _mm512_mask_loadu_epi8(r,
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mask, new_buf + i);
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uint64_t comp = _mm512_cmpeq_epi8_mask(old_data, new_data);
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count512s--;
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bool is_same = (comp & 0x1);
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while (bytes_to_check) {
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if (d + 2 > dlen) {
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return -1;
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}
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if (is_same) {
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if (nzrun_len) {
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d += uleb128_encode_small(dst + d, nzrun_len);
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if (d + nzrun_len > dlen) {
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return -1;
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}
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nzrun_start = new_buf + i - nzrun_len;
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memcpy(dst + d, nzrun_start, nzrun_len);
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d += nzrun_len;
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nzrun_len = 0;
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}
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/* 64 data at a time for speed */
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if (count512s && (comp == 0xffffffffffffffff)) {
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i += 64;
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zrun_len += 64;
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break;
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}
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never_same = false;
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num = ctz64(~comp);
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num = (num < bytes_to_check) ? num : bytes_to_check;
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zrun_len += num;
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bytes_to_check -= num;
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comp >>= num;
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i += num;
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if (bytes_to_check) {
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/* still has different data after same data */
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d += uleb128_encode_small(dst + d, zrun_len);
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zrun_len = 0;
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} else {
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break;
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}
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}
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if (never_same || zrun_len) {
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/*
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* never_same only acts if
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* data begins with diff in first count512s
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*/
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d += uleb128_encode_small(dst + d, zrun_len);
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zrun_len = 0;
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never_same = false;
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}
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/* has diff, 64 data at a time for speed */
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if ((bytes_to_check == 64) && (comp == 0x0)) {
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i += 64;
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nzrun_len += 64;
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break;
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}
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num = ctz64(comp);
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num = (num < bytes_to_check) ? num : bytes_to_check;
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nzrun_len += num;
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bytes_to_check -= num;
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comp >>= num;
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i += num;
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if (bytes_to_check) {
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/* mask like 111000 */
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d += uleb128_encode_small(dst + d, nzrun_len);
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/* overflow */
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if (d + nzrun_len > dlen) {
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return -1;
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}
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nzrun_start = new_buf + i - nzrun_len;
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memcpy(dst + d, nzrun_start, nzrun_len);
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d += nzrun_len;
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nzrun_len = 0;
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is_same = true;
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}
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}
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}
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if (nzrun_len != 0) {
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d += uleb128_encode_small(dst + d, nzrun_len);
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/* overflow */
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if (d + nzrun_len > dlen) {
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return -1;
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}
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nzrun_start = new_buf + i - nzrun_len;
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memcpy(dst + d, nzrun_start, nzrun_len);
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d += nzrun_len;
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}
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return d;
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}
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#endif
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