http://llvm.org/bugs/show_bug.cgi?id=20537
Bug ID: 20537
Summary: duration_cast has rounding bug converting long double
seconds to long long nanoseconds
Product: libc++
Version: unspecified
Hardware: PC
OS: All
Status: NEW
Severity: normal
Priority: P
Component: All Bugs
Assignee: [email protected]
Reporter: [email protected]
CC: [email protected], [email protected]
Classification: Unclassified
Created attachment 12856
--> http://llvm.org/bugs/attachment.cgi?id=12856&action=edit
Sample code demonstrating rounding bug
Converting from floating-point seconds to nanoseconds, there is a demonstrable
rounding bug. It looks like converting from floating-point seconds to integral
nanoseconds uses division by 1e-9 instead of multiplication by 1e9 which causes
rounding error when the floating-point storage is long double.
Sample code attached.
This problem does not appear to occur in gcc/libstdc++.
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