diff options
Diffstat (limited to 'pixman/test/utils-prng.c')
| -rw-r--r-- | pixman/test/utils-prng.c | 58 |
1 files changed, 53 insertions, 5 deletions
diff --git a/pixman/test/utils-prng.c b/pixman/test/utils-prng.c index 967b8989a..7b32e3531 100644 --- a/pixman/test/utils-prng.c +++ b/pixman/test/utils-prng.c @@ -107,6 +107,7 @@ randmemset_internal (prng_t *prng, { prng_t local_prng = *prng; prng_rand_128_data_t randdata; + size_t i; while (size >= 16) { @@ -138,6 +139,22 @@ randmemset_internal (prng_t *prng, }; 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) \ @@ -155,6 +172,18 @@ randmemset_internal (prng_t *prng, 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) @@ -198,7 +227,8 @@ randmemset_internal (prng_t *prng, } size -= 16; } - while (size > 0) + i = 0; + while (i < size) { uint8_t randbyte = prng_rand_r (&local_prng) & 0xFF; if (flags != 0) @@ -208,9 +238,25 @@ randmemset_internal (prng_t *prng, 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++ = randbyte; - size--; + buf[i] = randbyte; + i++; } *prng = local_prng; } @@ -218,8 +264,10 @@ randmemset_internal (prng_t *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_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, |