https://bugs.llvm.org/show_bug.cgi?id=40324
Bug ID: 40324
Summary: floating point NaN generation isn't considered a
constant expression
Product: clang
Version: trunk
Hardware: All
OS: All
Status: NEW
Severity: normal
Priority: P
Component: C++
Assignee: [email protected]
Reporter: [email protected]
CC: [email protected], [email protected],
[email protected], [email protected],
[email protected]
The following code isn't considered constexpr in clang/apple clang but does
work in gcc. I could not find anything in the standard(not an exhaustive look)
that indicated that this would not be allowed in a constant expression. The
worry is that if this is correct I would have to create code to ensure it
cannot happen. I tried trunk and latest Apple Clang with 11,14,17, and 2a
standards as arguments.
#include <limits>
constexpr bool cx() {
return std::numeric_limits<double>::infinity() -
std::numeric_limits<double>::infinity();
}
static_assert(cx(), "");
https://gcc.godbolt.org/z/DxFd2F
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