[Bug rtl-optimization/21182] [4.9/5/6 Regression] gcc can use registers but uses stack instead

[law at redhat dot com]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=21182

Jeffrey A. Law <law at redhat dot com> changed:

           What    |Removed                     |Added
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                 CC|                            |law at redhat dot com

--- Comment #18 from Jeffrey A. Law <law at redhat dot com> ---
I just checked this with the trunk.  While we're generating better code for
-UNAIL_REGS vs -NAIL_REGS, we still regressed.  For reference:

-O2 -DNAIL_REGS 91 references to %esp
-O2 -UNAIL_REGS 27 references to %esp

Similarly for -O3.