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Fix RNG seed code in stdlib for scalar target.

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This commit is contained in:
Matt Pharr
2012-01-29 13:46:57 -08:00
parent f8a7120d9c
commit b50f6f1730
1 changed files with 17 additions and 8 deletions
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25
stdlib.ispc
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@@ -3246,14 +3246,23 @@ static inline uniform unsigned int __seed4(RNGState * uniform state,
}
static inline void seed_rng(uniform RNGState * uniform state, uniform unsigned int seed) {
seed = __seed4(state, 0, seed);
if (programCount == 8)
__seed4(state, 4, seed ^ 0xbeeff00d);
if (programCount == 16) {
__seed4(state, 4, seed ^ 0xbeeff00d);
__seed4(state, 8, ((seed & 0xffff) << 16) | (seed >> 16));
__seed4(state, 12, (((seed & 0xff) << 24) | ((seed & 0xff00) << 8) |
((seed & 0xff0000) >> 8) | (seed & 0xff000000) >> 24));
if (programCount == 1) {
state->z1 = seed;
state->z2 = seed ^ 0xbeeff00d;
state->z3 = ((seed & 0xffff) << 16) | (seed >> 16);
state->z4 = (((seed & 0xff) << 24) | ((seed & 0xff00) << 8) |
((seed & 0xff0000) >> 8) | (seed & 0xff000000) >> 24);
}
else {
seed = __seed4(state, 0, seed);
if (programCount == 8)
__seed4(state, 4, seed ^ 0xbeeff00d);
if (programCount == 16) {
__seed4(state, 4, seed ^ 0xbeeff00d);
__seed4(state, 8, ((seed & 0xffff) << 16) | (seed >> 16));
__seed4(state, 12, (((seed & 0xff) << 24) | ((seed & 0xff00) << 8) |
((seed & 0xff0000) >> 8) | (seed & 0xff000000) >> 24));
}
}
}