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Fix x assign vs init randomization (#6075)

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This commit is contained in:
Todd Strader
2025-06-09 17:59:01 -04:00
committed by GitHub
parent a6bae7f196
commit d9534ec626
7 changed files with 47 additions and 55 deletions
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include/verilated.cpp
+24 -8
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@@ -438,6 +438,30 @@ WDataOutP VL_SCOPED_RAND_RESET_W(int obits, WDataOutP outwp, uint64_t scopeHash,
return outwp;
}
IData VL_SCOPED_RAND_RESET_ASSIGN_I(int obits, uint64_t scopeHash, uint64_t salt) VL_MT_UNSAFE {
IData data = ~0;
VlRNG rng(Verilated::threadContextp()->randSeed() ^ scopeHash ^ salt);
data = rng.rand64();
data &= VL_MASK_I(obits);
return data;
}
QData VL_SCOPED_RAND_RESET_ASSIGN_Q(int obits, uint64_t scopeHash, uint64_t salt) VL_MT_UNSAFE {
QData data = ~0ULL;
VlRNG rng(Verilated::threadContextp()->randSeed() ^ scopeHash ^ salt);
data = rng.rand64();
data &= VL_MASK_Q(obits);
return data;
}
WDataOutP VL_SCOPED_RAND_RESET_ASSIGN_W(int obits, WDataOutP outwp, uint64_t scopeHash,
uint64_t salt) VL_MT_UNSAFE {
VlRNG rng(Verilated::threadContextp()->randSeed() ^ scopeHash ^ salt);
for (int i = 0; i < VL_WORDS_I(obits) - 1; ++i) outwp[i] = rng.rand64();
outwp[VL_WORDS_I(obits) - 1] = rng.rand64() & VL_MASK_E(obits);
return outwp;
}
IData VL_RAND_RESET_I(int obits) VL_MT_SAFE {
if (Verilated::threadContextp()->randReset() == 0) return 0;
IData data = ~0;
@@ -447,7 +471,6 @@ IData VL_RAND_RESET_I(int obits) VL_MT_SAFE {
data &= VL_MASK_I(obits);
return data;
}
IData VL_RAND_RESET_ASSIGN_I(int obits) VL_MT_SAFE { return VL_RANDOM_I() & VL_MASK_I(obits); }
QData VL_RAND_RESET_Q(int obits) VL_MT_SAFE {
if (Verilated::threadContextp()->randReset() == 0) return 0;
@@ -459,18 +482,11 @@ QData VL_RAND_RESET_Q(int obits) VL_MT_SAFE {
return data;
}
QData VL_RAND_RESET_ASSIGN_Q(int obits) VL_MT_SAFE { return VL_RANDOM_Q() & VL_MASK_Q(obits); }
WDataOutP VL_RAND_RESET_W(int obits, WDataOutP outwp) VL_MT_SAFE {
for (int i = 0; i < VL_WORDS_I(obits) - 1; ++i) outwp[i] = VL_RAND_RESET_I(32);
outwp[VL_WORDS_I(obits) - 1] = VL_RAND_RESET_I(32) & VL_MASK_E(obits);
return outwp;
}
WDataOutP VL_RAND_RESET_ASSIGN_W(int obits, WDataOutP outwp) VL_MT_SAFE {
for (int i = 0; i < VL_WORDS_I(obits) - 1; ++i) outwp[i] = VL_RAND_RESET_ASSIGN_I(32);
outwp[VL_WORDS_I(obits) - 1] = VL_RAND_RESET_ASSIGN_I(32) & VL_MASK_E(obits);
return outwp;
}
WDataOutP VL_ZERO_RESET_W(int obits, WDataOutP outwp) VL_MT_SAFE {
// Not inlined to speed up compilation of slowpath code
return VL_ZERO_W(obits, outwp);