lntue b0dbd2ca5b

[libc][math] Add option to set a specific exponent for frexp with Inf/NaN inputs. (#112387) ...

In IEEE 754 and C standards, when calling `frexp` with Inf/Nan inputs,
the exponent result is unspecified. In this case, FreeBSD libc and musl
just passthrough `exp`, while glibc, FreeBSD libm set exp = 0, and MSVC
set exp = -1.

By default, LLVM libc will passthrough `exp` just as FreeBSD libc and
musl, but we also allow users to explicitly choose the return exp value
in this case for compatibility with other libc.

Notice that, gcc did generate passthrough `exp` for `frexp(NaN/Inf,
exp)`: https://godbolt.org/z/sM8fEej4E

2024-10-18 09:58:15 -04:00

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modules

[libc][math] Add option to set a specific exponent for frexp with Inf/NaN inputs. (#112387)

2024-10-18 09:58:15 -04:00