https://bugs.kde.org/show_bug.cgi?id=381553

--- Comment #15 from Julian Seward <[email protected]> ---
I think it's done (in a stupid way) using the has_hlrs hint boolean and the
loop beginning at host_generic_reg_alloc2.c:1367 (after applying the patch).
If the code contains any calls at all then the caller-save registers will be
marked with .has_hlrs = True, and so the search loop tries to avoid these
(by assigning them to k_suboptimal rather than k) if possible.

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