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UnrealEngine/Engine/Source/ThirdParty/Intel/ISPC/ispc-1.24.0/tests/rdrand-3.ispc
2025-05-18 13:04:45 +08:00

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#include "../test_static.isph"
task void f_f(uniform float RET[], uniform float aFOO[]) {
#ifndef ISPC_HAS_RAND
RET[programIndex] = 1;
#else
int lessHalf = 0, moreHalf = 0;
for (uniform int i = 0; i < 1024*1024; ++i) {
float r = -1;
while (!rdrand(&r))
;
if (r < 0.5) ++lessHalf;
else ++moreHalf;
}
float r = (double)lessHalf / (double)(lessHalf + moreHalf);
RET[programIndex] = (r >= .49 && r < .51);
#endif
}
task void result(uniform float RET[]) {
RET[programIndex] = 1;
}