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[/] [openrisc/] [tags/] [gnu-src/] [gcc-4.5.1/] [gcc-4.5.1-or32-1.0rc3/] [gcc/] [testsuite/] [gcc.target/] [i386/] [sse4_2-crc32.h] - Rev 839
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#include "sse4_2-check.h" #include <nmmintrin.h> #include <string.h> #define POLYNOMIAL 0x11EDC6F41LL #define MAX_BUF 16 static void shift_mem_by1 (unsigned char* buf, int len) { int i; for (i = len - 1; i >= 0; i--) { buf[i] = buf[i] << 1; if (i > 0 && (buf[i-1] & 0x80)) buf[i] |= 1; } } static void do_div (unsigned char* buf, unsigned char* div) { int i; for (i = 0; i < 5; i++) buf[i] ^= div[i]; } static unsigned int calc_rem (unsigned char* buf, int len) { union { unsigned long long ll; unsigned char c[8]; } divisor; union { unsigned int i; unsigned char c[4]; } ret; unsigned char *div_buf; unsigned char divident[MAX_BUF]; int disp = len / 8; int i; divisor.ll = POLYNOMIAL << 7LL; memcpy (divident, buf, disp); div_buf = divident + disp - 5; for (i = 0; i < len - 32; i++) { if ((div_buf[4] & 0x80)) do_div (div_buf, divisor.c); shift_mem_by1 (divident, disp); } memcpy (ret.c, div_buf + 1, sizeof (ret)); return ret.i; } static void reverse_bits (unsigned char *src, int len) { unsigned char buf[MAX_BUF]; unsigned char *tmp = buf + len - 1; unsigned char ch; int i, j; for (i = 0; i < len; i++) { ch = 0; for (j = 0; j < 8; j++) if ((src[i] & (1 << j))) ch |= 1 << (7 - j); *tmp-- = ch; } for (i = 0; i < len; i++) src[i] = buf[i]; } static void shift_mem ( unsigned char *src, unsigned char *dst, int len, int shft) { int disp = shft / 8; int i; memset (dst, 0, len + disp); for (i = 0; i < len; i++) dst[i + disp] = src[i]; } static void xor_mem (unsigned char *src, unsigned char *dst, int len) { int disp = len / 8; int i; for (i = 0; i < disp; i++) dst[i] ^= src[i]; } static DST_T compute_crc32 (DST_T crc, SRC_T inp) { unsigned char crcbuf[sizeof (DST_T)]; unsigned char inbuf[sizeof (SRC_T)]; unsigned char tmp1[MAX_BUF], tmp2[MAX_BUF]; int crc_sh, xor_sz; union { unsigned int i; unsigned char c[4]; } ret; crc_sh = sizeof (SRC_T) * 8; xor_sz = 32 + crc_sh; memcpy (crcbuf, &crc, sizeof (DST_T)); memcpy (inbuf, &inp, sizeof (SRC_T)); reverse_bits (crcbuf, 4); reverse_bits (inbuf, sizeof (SRC_T)); shift_mem (inbuf, tmp1, sizeof (SRC_T), 32); shift_mem (crcbuf, tmp2, 4, crc_sh); xor_mem (tmp1, tmp2, xor_sz); ret.i = calc_rem (tmp2, xor_sz); reverse_bits (ret.c, 4); return (DST_T)ret.i; } #define NUM 1024 static void sse4_2_test (void) { DST_T dst[NUM]; SRC_T src[NUM]; int i; for (i = 0; i < NUM; i++) { dst[i] = rand (); if (sizeof (DST_T) > 4) dst[i] |= (DST_T)rand () << (DST_T)(sizeof (DST_T) * 4); src[i] = rand (); if (sizeof (SRC_T) > 4) src[i] |= (SRC_T)rand () << (SRC_T)(sizeof (DST_T) * 4); } for (i = 0; i < NUM; i++) if (CRC32 (dst[i], src[i]) != compute_crc32 (dst[i], src[i])) abort (); }
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