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/*
* Ceph - scalable distributed file system
*
* Copyright (C) 2014 CERN (Switzerland)
* * Author: Andreas-Joachim Peters <Andreas.Joachim.Peters@cern.ch> *
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
*/
// -----------------------------------------------------------------------------
#include "xor_op.h"
#include <stdio.h>
#include <string.h>
#include "arch/intel.h"
#include "include/ceph_assert.h"
// -----------------------------------------------------------------------------
// -----------------------------------------------------------------------------
void
// -----------------------------------------------------------------------------
byte_xor(unsigned char* cw, unsigned char* dw, unsigned char* ew)
// -----------------------------------------------------------------------------
{
while (cw < ew)
*dw++ ^= *cw++;
}
// -----------------------------------------------------------------------------
void
// -----------------------------------------------------------------------------
vector_xor(vector_op_t* cw,
vector_op_t* dw,
vector_op_t* ew)
// -----------------------------------------------------------------------------
{
ceph_assert(is_aligned(cw, EC_ISA_VECTOR_OP_WORDSIZE));
ceph_assert(is_aligned(dw, EC_ISA_VECTOR_OP_WORDSIZE));
ceph_assert(is_aligned(ew, EC_ISA_VECTOR_OP_WORDSIZE));
while (cw < ew) {
*dw++ ^= *cw++;
}
}
// -----------------------------------------------------------------------------
void
// -----------------------------------------------------------------------------
region_xor(unsigned char** src,
unsigned char* parity,
int src_size,
unsigned size)
{
if (!size) {
// nothing to do
return;
}
if (!src_size) {
// nothing to do
return;
}
if (src_size == 1) {
// just copy source to parity
memcpy(parity, src[0], size);
return;
}
unsigned size_left = size;
// ----------------------------------------------------------
// region or vector XOR operations require aligned addresses
// ----------------------------------------------------------
bool src_aligned = true;
for (int i = 0; i < src_size; i++) {
src_aligned &= is_aligned(src[i], EC_ISA_VECTOR_OP_WORDSIZE);
}
if (src_aligned &&
is_aligned(parity, EC_ISA_VECTOR_OP_WORDSIZE)) {
#ifdef __x86_64__
if (ceph_arch_intel_sse2) {
// -----------------------------
// use SSE2 region xor function
// -----------------------------
unsigned region_size =
(size / EC_ISA_VECTOR_SSE2_WORDSIZE) * EC_ISA_VECTOR_SSE2_WORDSIZE;
size_left -= region_size;
// 64-byte region xor
region_sse2_xor((char**) src, (char*) parity, src_size, region_size);
} else
#endif
{
// --------------------------------------------
// use region xor based on vector xor operation
// --------------------------------------------
unsigned vector_words = size / EC_ISA_VECTOR_OP_WORDSIZE;
unsigned vector_size = vector_words * EC_ISA_VECTOR_OP_WORDSIZE;
memcpy(parity, src[0], vector_size);
size_left -= vector_size;
vector_op_t* p_vec = (vector_op_t*) parity;
for (int i = 1; i < src_size; i++) {
vector_op_t* s_vec = (vector_op_t*) src[i];
vector_op_t* e_vec = s_vec + vector_words;
vector_xor(s_vec, p_vec, e_vec);
}
}
}
if (size_left) {
// --------------------------------------------------
// xor the not aligned part with byte-wise region xor
// --------------------------------------------------
memcpy(parity + size - size_left, src[0] + size - size_left, size_left);
for (int i = 1; i < src_size; i++) {
byte_xor(src[i] + size - size_left, parity + size - size_left, src[i] + size);
}
}
}
// -----------------------------------------------------------------------------
void
// -----------------------------------------------------------------------------
region_sse2_xor(char** src,
char* parity,
int src_size,
unsigned size)
// -----------------------------------------------------------------------------
{
#ifdef __x86_64__
ceph_assert(!(size % EC_ISA_VECTOR_SSE2_WORDSIZE));
unsigned char* p;
int d, l;
unsigned i;
unsigned char* vbuf[256];
for (int v = 0; v < src_size; v++) {
vbuf[v] = (unsigned char*) src[v];
}
l = src_size;
p = (unsigned char*) parity;
for (i = 0; i < size; i += EC_ISA_VECTOR_SSE2_WORDSIZE) {
asm volatile("movdqa %0,%%xmm0" : : "m" (vbuf[0][i]));
asm volatile("movdqa %0,%%xmm1" : : "m" (vbuf[0][i + 16]));
asm volatile("movdqa %0,%%xmm2" : : "m" (vbuf[0][i + 32]));
asm volatile("movdqa %0,%%xmm3" : : "m" (vbuf[0][i + 48]));
for (d = 1; d < l; d++) {
asm volatile("movdqa %0,%%xmm4" : : "m" (vbuf[d][i]));
asm volatile("movdqa %0,%%xmm5" : : "m" (vbuf[d][i + 16]));
asm volatile("movdqa %0,%%xmm6" : : "m" (vbuf[d][i + 32]));
asm volatile("movdqa %0,%%xmm7" : : "m" (vbuf[d][i + 48]));
asm volatile("pxor %xmm4,%xmm0");
asm volatile("pxor %xmm5,%xmm1");
asm volatile("pxor %xmm6,%xmm2");
asm volatile("pxor %xmm7,%xmm3");
}
asm volatile("movntdq %%xmm0,%0" : "=m" (p[i]));
asm volatile("movntdq %%xmm1,%0" : "=m" (p[i + 16]));
asm volatile("movntdq %%xmm2,%0" : "=m" (p[i + 32]));
asm volatile("movntdq %%xmm3,%0" : "=m" (p[i + 48]));
}
asm volatile("sfence" : : : "memory");
#endif // __x86_64__
return;
}
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