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-rw-r--r--libs/pixman-0.40.0/test/utils-prng.c311
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diff --git a/libs/pixman-0.40.0/test/utils-prng.c b/libs/pixman-0.40.0/test/utils-prng.c
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-/*
- * Copyright © 2012 Siarhei Siamashka <siarhei.siamashka@gmail.com>
- *
- * Based on the public domain implementation of small noncryptographic PRNG
- * authored by Bob Jenkins: http://burtleburtle.net/bob/rand/smallprng.html
- *
- * Permission is hereby granted, free of charge, to any person obtaining a
- * copy of this software and associated documentation files (the "Software"),
- * to deal in the Software without restriction, including without limitation
- * the rights to use, copy, modify, merge, publish, distribute, sublicense,
- * and/or sell copies of the Software, and to permit persons to whom the
- * Software is furnished to do so, subject to the following conditions:
- *
- * The above copyright notice and this permission notice (including the next
- * paragraph) shall be included in all copies or substantial portions of the
- * Software.
- *
- * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
- * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
- * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
- * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
- * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
- * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
- * DEALINGS IN THE SOFTWARE.
- */
-
-#include "utils.h"
-#include "utils-prng.h"
-
-#if defined(HAVE_GCC_VECTOR_EXTENSIONS) && defined(__SSE2__)
-#include <xmmintrin.h>
-#endif
-
-void smallprng_srand_r (smallprng_t *x, uint32_t seed)
-{
- uint32_t i;
- x->a = 0xf1ea5eed, x->b = x->c = x->d = seed;
- for (i = 0; i < 20; ++i)
- smallprng_rand_r (x);
-}
-
-/*
- * Set a 32-bit seed for PRNG
- *
- * LCG is used here for generating independent seeds for different
- * smallprng instances (in the case if smallprng is also used for
- * generating these seeds, "Big Crush" test from TestU01 detects
- * some problems in the glued 'prng_rand_128_r' output data).
- * Actually we might be even better using some cryptographic
- * hash for this purpose, but LCG seems to be also enough for
- * passing "Big Crush".
- */
-void prng_srand_r (prng_t *x, uint32_t seed)
-{
-#ifdef HAVE_GCC_VECTOR_EXTENSIONS
- int i;
- prng_rand_128_data_t dummy;
- smallprng_srand_r (&x->p0, seed);
- x->a[0] = x->a[1] = x->a[2] = x->a[3] = 0xf1ea5eed;
- x->b[0] = x->c[0] = x->d[0] = (seed = seed * 1103515245 + 12345);
- x->b[1] = x->c[1] = x->d[1] = (seed = seed * 1103515245 + 12345);
- x->b[2] = x->c[2] = x->d[2] = (seed = seed * 1103515245 + 12345);
- x->b[3] = x->c[3] = x->d[3] = (seed = seed * 1103515245 + 12345);
- for (i = 0; i < 20; ++i)
- prng_rand_128_r (x, &dummy);
-#else
- smallprng_srand_r (&x->p0, seed);
- smallprng_srand_r (&x->p1, (seed = seed * 1103515245 + 12345));
- smallprng_srand_r (&x->p2, (seed = seed * 1103515245 + 12345));
- smallprng_srand_r (&x->p3, (seed = seed * 1103515245 + 12345));
- smallprng_srand_r (&x->p4, (seed = seed * 1103515245 + 12345));
-#endif
-}
-
-static force_inline void
-store_rand_128_data (void *addr, prng_rand_128_data_t *d, int aligned)
-{
-#ifdef HAVE_GCC_VECTOR_EXTENSIONS
- if (aligned)
- {
- *(uint8x16 *)addr = d->vb;
- return;
- }
- else
- {
-#ifdef __SSE2__
- /* workaround for http://gcc.gnu.org/PR55614 */
- _mm_storeu_si128 (addr, _mm_loadu_si128 ((__m128i *)d));
- return;
-#endif
- }
-#endif
- /* we could try something better for unaligned writes (packed attribute),
- * but GCC is not very reliable: http://gcc.gnu.org/PR55454 */
- memcpy (addr, d, 16);
-}
-
-/*
- * Helper function and the actual code for "prng_randmemset_r" function
- */
-static force_inline void
-randmemset_internal (prng_t *prng,
- uint8_t *buf,
- size_t size,
- prng_randmemset_flags_t flags,
- int aligned)
-{
- prng_t local_prng = *prng;
- prng_rand_128_data_t randdata;
- size_t i;
-
- while (size >= 16)
- {
- prng_rand_128_data_t t;
- if (flags == 0)
- {
- prng_rand_128_r (&local_prng, &randdata);
- }
- else
- {
- prng_rand_128_r (&local_prng, &t);
- prng_rand_128_r (&local_prng, &randdata);
-#ifdef HAVE_GCC_VECTOR_EXTENSIONS
- if (flags & RANDMEMSET_MORE_FF)
- {
- const uint8x16 const_C0 =
- {
- 0xC0, 0xC0, 0xC0, 0xC0, 0xC0, 0xC0, 0xC0, 0xC0,
- 0xC0, 0xC0, 0xC0, 0xC0, 0xC0, 0xC0, 0xC0, 0xC0
- };
- randdata.vb |= (t.vb >= const_C0);
- }
- if (flags & RANDMEMSET_MORE_00)
- {
- const uint8x16 const_40 =
- {
- 0x40, 0x40, 0x40, 0x40, 0x40, 0x40, 0x40, 0x40,
- 0x40, 0x40, 0x40, 0x40, 0x40, 0x40, 0x40, 0x40
- };
- randdata.vb &= (t.vb >= const_40);
- }
- if (flags & RANDMEMSET_MORE_FFFFFFFF)
- {
- const uint32x4 const_C0000000 =
- {
- 0xC0000000, 0xC0000000, 0xC0000000, 0xC0000000
- };
- randdata.vw |= ((t.vw << 30) >= const_C0000000);
- }
- if (flags & RANDMEMSET_MORE_00000000)
- {
- const uint32x4 const_40000000 =
- {
- 0x40000000, 0x40000000, 0x40000000, 0x40000000
- };
- randdata.vw &= ((t.vw << 30) >= const_40000000);
- }
-#else
- #define PROCESS_ONE_LANE(i) \
- if (flags & RANDMEMSET_MORE_FF) \
- { \
- uint32_t mask_ff = (t.w[i] & (t.w[i] << 1)) & 0x80808080; \
- mask_ff |= mask_ff >> 1; \
- mask_ff |= mask_ff >> 2; \
- mask_ff |= mask_ff >> 4; \
- randdata.w[i] |= mask_ff; \
- } \
- if (flags & RANDMEMSET_MORE_00) \
- { \
- uint32_t mask_00 = (t.w[i] | (t.w[i] << 1)) & 0x80808080; \
- mask_00 |= mask_00 >> 1; \
- mask_00 |= mask_00 >> 2; \
- mask_00 |= mask_00 >> 4; \
- randdata.w[i] &= mask_00; \
- } \
- if (flags & RANDMEMSET_MORE_FFFFFFFF) \
- { \
- int32_t mask_ff = ((t.w[i] << 30) & (t.w[i] << 31)) & \
- 0x80000000; \
- randdata.w[i] |= mask_ff >> 31; \
- } \
- if (flags & RANDMEMSET_MORE_00000000) \
- { \
- int32_t mask_00 = ((t.w[i] << 30) | (t.w[i] << 31)) & \
- 0x80000000; \
- randdata.w[i] &= mask_00 >> 31; \
- }
-
- PROCESS_ONE_LANE (0)
- PROCESS_ONE_LANE (1)
- PROCESS_ONE_LANE (2)
- PROCESS_ONE_LANE (3)
-#endif
- }
- if (is_little_endian ())
- {
- store_rand_128_data (buf, &randdata, aligned);
- buf += 16;
- }
- else
- {
-
-#ifndef __has_builtin
-#define __has_builtin(x) 0
-#endif
-
-#ifdef HAVE_GCC_VECTOR_EXTENSIONS
-# if __has_builtin(__builtin_shufflevector)
- randdata.vb =
- __builtin_shufflevector (randdata.vb, randdata.vb,
- 3, 2, 1, 0, 7, 6 , 5, 4,
- 11, 10, 9, 8, 15, 14, 13, 12);
-# else
- static const uint8x16 bswap_shufflemask =
- {
- 3, 2, 1, 0, 7, 6, 5, 4, 11, 10, 9, 8, 15, 14, 13, 12
- };
- randdata.vb = __builtin_shuffle (randdata.vb, bswap_shufflemask);
-# endif
-
- store_rand_128_data (buf, &randdata, aligned);
- buf += 16;
-#else
- uint8_t t1, t2, t3, t4;
- #define STORE_ONE_LANE(i) \
- t1 = randdata.b[i * 4 + 3]; \
- t2 = randdata.b[i * 4 + 2]; \
- t3 = randdata.b[i * 4 + 1]; \
- t4 = randdata.b[i * 4 + 0]; \
- *buf++ = t1; \
- *buf++ = t2; \
- *buf++ = t3; \
- *buf++ = t4;
-
- STORE_ONE_LANE (0)
- STORE_ONE_LANE (1)
- STORE_ONE_LANE (2)
- STORE_ONE_LANE (3)
-#endif
- }
- size -= 16;
- }
- i = 0;
- while (i < size)
- {
- uint8_t randbyte = prng_rand_r (&local_prng) & 0xFF;
- if (flags != 0)
- {
- uint8_t t = prng_rand_r (&local_prng) & 0xFF;
- if ((flags & RANDMEMSET_MORE_FF) && (t >= 0xC0))
- randbyte = 0xFF;
- if ((flags & RANDMEMSET_MORE_00) && (t < 0x40))
- randbyte = 0x00;
- if (i % 4 == 0 && i + 4 <= size)
- {
- t = prng_rand_r (&local_prng) & 0xFF;
- if ((flags & RANDMEMSET_MORE_FFFFFFFF) && (t >= 0xC0))
- {
- memset(&buf[i], 0xFF, 4);
- i += 4;
- continue;
- }
- if ((flags & RANDMEMSET_MORE_00000000) && (t < 0x40))
- {
- memset(&buf[i], 0x00, 4);
- i += 4;
- continue;
- }
- }
- }
- buf[i] = randbyte;
- i++;
- }
- *prng = local_prng;
-}
-
-/*
- * Fill memory buffer with random data. Flags argument may be used
- * to tweak some statistics properties:
- * RANDMEMSET_MORE_00 - set ~25% of bytes to 0x00
- * RANDMEMSET_MORE_FF - set ~25% of bytes to 0xFF
- * RANDMEMSET_MORE_00000000 - ~25% chance for 00000000 4-byte clusters
- * RANDMEMSET_MORE_FFFFFFFF - ~25% chance for FFFFFFFF 4-byte clusters
- */
-void prng_randmemset_r (prng_t *prng,
- void *voidbuf,
- size_t size,
- prng_randmemset_flags_t flags)
-{
- uint8_t *buf = (uint8_t *)voidbuf;
- if ((uintptr_t)buf & 15)
- {
- /* unaligned buffer */
- if (flags == 0)
- randmemset_internal (prng, buf, size, 0, 0);
- else if (flags == RANDMEMSET_MORE_00_AND_FF)
- randmemset_internal (prng, buf, size, RANDMEMSET_MORE_00_AND_FF, 0);
- else
- randmemset_internal (prng, buf, size, flags, 0);
- }
- else
- {
- /* aligned buffer */
- if (flags == 0)
- randmemset_internal (prng, buf, size, 0, 1);
- else if (flags == RANDMEMSET_MORE_00_AND_FF)
- randmemset_internal (prng, buf, size, RANDMEMSET_MORE_00_AND_FF, 1);
- else
- randmemset_internal (prng, buf, size, flags, 1);
- }
-}
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