[Bug target/121652] [15/16 Regression] round builtin does not raise FE_INVALID for signaling NaN

[aurelien at aurel32 dot net]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=121652

--- Comment #22 from Aurelien Jarno <aurelien at aurel32 dot net> ---
I have posted a patch to the gcc-patches mailing-list:
https://gcc.gnu.org/pipermail/gcc-patches/2025-September/696217.html