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Add +verilator+seed, bug1396.

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This commit is contained in:
Wilson Snyder
2019-02-04 20:28:17 -05:00
parent 426ed8589b
commit 27fa19eb94
6 changed files with 78 additions and 9 deletions
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include/verilated.cpp
+23 -8
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@@ -208,6 +208,7 @@ void VL_PRINTF_MT(const char* formatp, ...) VL_MT_SAFE {
Verilated::Serialized::Serialized() {
s_randReset = 0;
s_randSeed = 0;
s_debug = 0;
s_calcUnusedSigs = false;
s_gotFinish = false;
@@ -245,18 +246,25 @@ vluint64_t vl_rand64() VL_MT_SAFE {
static VL_THREAD_LOCAL bool t_seeded = false;
static VL_THREAD_LOCAL vluint64_t t_state[2];
if (VL_UNLIKELY(!t_seeded)) {
t_seeded = true;
{
VerilatedLockGuard lock(s_mutex);
t_state[0] = ((static_cast<vluint64_t>(vl_sys_rand32()) << 32)
^ (static_cast<vluint64_t>(vl_sys_rand32())));
t_state[1] = ((static_cast<vluint64_t>(vl_sys_rand32()) << 32)
^ (static_cast<vluint64_t>(vl_sys_rand32())));
t_seeded = true;
{
VerilatedLockGuard lock(s_mutex);
if (Verilated::randSeed() != 0) {
t_state[0] = ((static_cast<vluint64_t>(Verilated::randSeed()) << 32)
^ (static_cast<vluint64_t>(Verilated::randSeed())));
t_state[1] = ((static_cast<vluint64_t>(Verilated::randSeed()) << 32)
^ (static_cast<vluint64_t>(Verilated::randSeed())));
} else {
t_state[0] = ((static_cast<vluint64_t>(vl_sys_rand32()) << 32)
^ (static_cast<vluint64_t>(vl_sys_rand32())));
t_state[1] = ((static_cast<vluint64_t>(vl_sys_rand32()) << 32)
^ (static_cast<vluint64_t>(vl_sys_rand32())));
}
// Fix state as algorithm is slow to randomize if many zeros
// This causes a loss of ~ 1 bit of seed entropy, no big deal
if (VL_COUNTONES_I(t_state[0]) < 10) t_state[0] = ~t_state[0];
if (VL_COUNTONES_I(t_state[1]) < 10) t_state[1] = ~t_state[1];
}
}
}
// Xoroshiro128+ algorithm
vluint64_t result = t_state[0] + t_state[1];
@@ -1670,6 +1678,10 @@ void Verilated::randReset(int val) VL_MT_SAFE {
VerilatedLockGuard lock(m_mutex);
s_s.s_randReset = val;
}
void Verilated::randSeed(int val) VL_MT_SAFE {
VerilatedLockGuard lock(m_mutex);
s_s.s_randSeed = val;
}
void Verilated::calcUnusedSigs(bool flag) VL_MT_SAFE {
VerilatedLockGuard lock(m_mutex);
s_s.s_calcUnusedSigs = flag;
@@ -1879,6 +1891,9 @@ void VerilatedImp::commandArgVl(const std::string& arg) {
else if (commandArgVlValue(arg, "+verilator+rand+reset+", value/*ref*/)) {
Verilated::randReset(atoi(value.c_str()));
}
else if (commandArgVlValue(arg, "+verilator+seed+", value/*ref*/)) {
Verilated::randSeed(atoi(value.c_str()));
}
else if (arg == "+verilator+V") {
versionDump(); // Someday more info too
VL_FATAL_MT("COMMAND_LINE", 0, "", "Exiting due to command line argument (not an error)");