[Bug rtl-optimization/107167] It looks like GCC wastes registers on trivial computations when result can be cached

[unlvsur at live dot com]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=107167

--- Comment #4 from cqwrteur <unlvsur at live dot com> ---
(In reply to Andrew Pinski from comment #1)
> Plus your example might be slower due to dependencies.


Dependency is only an issue to a certain degree. 1st one it has things like
"movl    %edi, %edx;  rorl    $11, %edx" which is also a flow dependency.

CPU solves flow dependency to a very large degree with register forwarding.

Write dependencies are also dealt with register renaming if we save registers,
register renaming will also save time.