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guard against div-by-zero

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This commit is contained in:
Marshall Mohror
2022-07-06 13:00:00 -05:00
parent b2ad4dd189
commit e71d457af9
1 changed files with 5 additions and 2 deletions
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7
src/common/x64/cpu_detect.cpp
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@@ -170,8 +170,11 @@ static CPUCaps Detect() {
// The CPU model can be detected to use the values from turbostat // The CPU model can be detected to use the values from turbostat
// https://github.com/torvalds/linux/blob/master/tools/power/x86/turbostat/turbostat.c#L5569 // https://github.com/torvalds/linux/blob/master/tools/power/x86/turbostat/turbostat.c#L5569
// but it's easier to just estimate the TSC tick rate for these cases. // but it's easier to just estimate the TSC tick rate for these cases.
caps.tsc_frequency = static_cast<u64>(caps.crystal_frequency) * if (caps.tsc_crystal_ratio_denominator) {
caps.tsc_crystal_ratio_numerator / caps.tsc_crystal_ratio_denominator; caps.tsc_frequency = static_cast<u64>(caps.crystal_frequency) *
caps.tsc_crystal_ratio_numerator /
caps.tsc_crystal_ratio_denominator;
}
} }
if (max_std_fn >= 0x16) { if (max_std_fn >= 0x16) {