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integration of Intel SIMD CRC routines for CRC24A/B

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This commit is contained in:
Eurecom
2021-11-01 17:26:31 +01:00
parent 64e610361f
commit afe2f1ed71
1 changed files with 57 additions and 7 deletions
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openair1/PHY/CODING/crc_byte.c
+57 -7
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@@ -30,10 +30,14 @@
Modified in June, 2001, to include the length non multiple of 8
*/
#define USE_INTEL_CRC 1
#include "coding_defs.h"
#include "assertions.h"
#ifdef USE_INTEL_CRC
#include "crc_intel.h"
#include "crc.h"
#endif
/*ref 36-212 v8.6.0 , pp 8-9 */
/* the highest degree is set by default */
@@ -94,6 +98,28 @@ static unsigned short crc11Table[256];
static unsigned char crc8Table[256];
static unsigned char crc6Table[256];
#ifdef USE_INTEL_CRC
static DECLARE_ALIGNED(struct crc_pclmulqdq_ctx lte_crc24a_pclmulqdq, 16) = {
0x64e4d700, /**< k1 */
0x2c8c9d00, /**< k2 */
0xd9fe8c00, /**< k3 */
0xf845fe24, /**< q */
0x864cfb00, /**< p */
0ULL /**< res */
};
__m128i crc_xmm_be_le_swap128;
DECLARE_ALIGNED(const uint8_t crc_xmm_shift_tab[48], 16) = {
0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
0x00, 0x01, 0x02, 0x03, 0x04, 0x05, 0x06, 0x07,
0x08, 0x09, 0x0a, 0x0b, 0x0c, 0x0d, 0x0e, 0x0f,
0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff
};
#endif
void crcTableInit (void)
{
unsigned char c = 0;
@@ -108,14 +134,20 @@ void crcTableInit (void)
crc8Table[c] = (unsigned char) (crcbit (&c, 1, poly8) >> 24);
crc6Table[c] = (unsigned char) (crcbit (&c, 1, poly6) >> 24);
} while (++c);
#ifdef USE_INTEL_CRC
crc_xmm_be_le_swap128 = _mm_setr_epi32(0x0c0d0e0f, 0x08090a0b,
0x04050607, 0x00010203);
#endif
}
/*********************************************************
Byte by byte implementations,
Byte by byte LUT implementations,
assuming initial byte is 0 padded (in MSB) if necessary
can use SIMD optimized Intel CRC for LTE/NR 24a/24b variants
*********************************************************/
unsigned int crc24a (unsigned char * inptr,
int bitlen)
{
@@ -124,7 +156,7 @@ unsigned int crc24a (unsigned char * inptr,
unsigned int crc = 0;
octetlen = bitlen / 8; /* Change in octets */
resbit = (bitlen % 8);
#ifndef USE_INTEL_CRC
while (octetlen-- > 0) {
// printf("crc24a: in %x => crc %x\n",crc,*inptr);
crc = (crc << 8) ^ crc24aTable[(*inptr++) ^ (crc >> 24)];
@@ -132,18 +164,32 @@ unsigned int crc24a (unsigned char * inptr,
if (resbit > 0)
crc = (crc << resbit) ^ crc24aTable[((*inptr) >> (8 - resbit)) ^ (crc >> (32 - resbit))];
return crc;
#else
return crc32_calc_pclmulqdq(inptr, octetlen, 0,
&lte_crc24a_pclmulqdq) >> 8;
#endif
}
#ifdef USE_INTEL_CRC
static DECLARE_ALIGNED(struct crc_pclmulqdq_ctx lte_crc24b_pclmulqdq, 16) = {
0x80140500, /**< k1 */
0x42000100, /**< k2 */
0x90042100, /**< k3 */
0xffff83ff, /**< q */
0x80006300, /**< p */
0ULL /**< res */
};
#endif
unsigned int crc24b (unsigned char * inptr,
int bitlen)
int bitlen)
{
int octetlen, resbit;
unsigned int crc = 0;
octetlen = bitlen / 8; /* Change in octets */
resbit = (bitlen % 8);
#ifndef USE_INTEL_CRC
while (octetlen-- > 0) {
// printf("crc24b: in %x => crc %x (%x)\n",crc,*inptr,crc24bTable[(*inptr) ^ (crc >> 24)]);
crc = (crc << 8) ^ crc24bTable[(*inptr++) ^ (crc >> 24)];
@@ -153,6 +199,10 @@ unsigned int crc24b (unsigned char * inptr,
crc = (crc << resbit) ^ crc24bTable[((*inptr) >> (8 - resbit)) ^ (crc >> (32 - resbit))];
return crc;
#else
return crc32_calc_pclmulqdq(inptr, octetlen, 0,
&lte_crc24b_pclmulqdq) >> 8;
#endif
}
unsigned int crc24c (unsigned char * inptr,