hypotf now widens both arguments to double and calls the double hypot.
The float-to-double conversion raises FE_INVALID for a signaling NaN and
quiets it, so hypotf(sNaN, inf) returns +inf with the invalid flag set in
either argument order, matching the PS5 libc routine. Before, MinGW UCRT's
hypotf returned +inf without the flag and glibc's returned NaN.
Co-Authored-By: Claude Opus 5.5 (1M context) <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01Scr6DkuJDqiUcJHr9mJv6T
Both forward to std::hypot, which computes without intermediate
overflow and returns infinity when either argument is infinite, even
if the other is NaN. The math test checks those cases.
Co-Authored-By: Claude Opus 5.5 (1M context) <noreply@anthropic.com>
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