[Bug target/79712] Clang smarter about unrolling in fhourstones benchmark

[rguenth at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=79712

Richard Biener <rguenth at gcc dot gnu.org> changed:

           What    |Removed                     |Added
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           Keywords|                            |missed-optimization

--- Comment #7 from Richard Biener <rguenth at gcc dot gnu.org> ---
Note that GCC doesn't do traditional unrolling by default and if enabled via
-funroll-loops it does a lousy job (which is why it is _not_ enabled by
default).

GCC merely unrolls as part of other transforms (those applying are then the
cost model).