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Fix CPUID subleaf iteration

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This commit is contained in:
Pieter Wuille 2019-11-19 14:55:02 -08:00
parent b4a1da9ef8
commit ba2c5fe147
1 changed files with 15 additions and 4 deletions
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19
src/randomenv.cpp
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@ -198,12 +198,23 @@ void AddAllCPUID(CSHA512& hasher)
AddCPUID(hasher, 0, 0, ax, bx, cx, dx); // Returns max leaf in ax
uint32_t max = ax;
for (uint32_t leaf = 1; leaf <= max; ++leaf) {
uint32_t maxsub = 0;
for (uint32_t subleaf = 0;; ++subleaf) {
AddCPUID(hasher, leaf, subleaf, ax, bx, cx, dx);
// Iterate over subleaves for leaf 4, 11, 13
if (leaf != 4 && leaf != 11 && leaf != 13) break;
if ((leaf == 4 || leaf == 13) && ax == 0) break;
if (leaf == 11 && (cx & 0xFF00) == 0) break;
// Iterate subleafs for leaf values 4, 7, 11, 13
if (leaf == 4) {
if ((ax & 0x1f) == 0) break;
} else if (leaf == 7) {
if (subleaf == 0) maxsub = ax;
if (subleaf == maxsub) break;
} else if (leaf == 11) {
if ((cx & 0xff00) == 0) break;
} else if (leaf == 13) {
if (ax == 0 && bx == 0 && cx == 0 && dx == 0) break;
} else {
// For any other leaf, stop after subleaf 0.
break;
}
}
}
// Iterate over all extended leaves