[Bug middle-end/66986] poor performance of __builtin_isinf on x64

[neleai at seznam dot cz]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=66986

--- Comment #1 from Ondrej Bilka <neleai at seznam dot cz> ---
Created attachment 36047
  --> https://gcc.gnu.org/bugzilla/attachment.cgi?id=36047&action=edit
testing script