[Bug middle-end/64313] [5 Regression] gcc.dg/torture/builtin-explog-1.c fails on bare-metal targets

[rguenth at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=64313

--- Comment #7 from Richard Biener <rguenth at gcc dot gnu.org> ---
Created attachment 34485
  --> https://gcc.gnu.org/bugzilla/attachment.cgi?id=34485&action=edit
patch

The middle-end approach, testing on x86_64-linux, verified that it fixes the
testcase on aarch64-elf.