[Bug rtl-optimization/125375] [16/17 Regression] wrong code at -O{2,3} with "-fno-inline -fno-compare-elim" on x86_64-linux-gnu since r16-1551

[pinskia at gcc dot gnu.org via Gcc-bugs]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=125375

--- Comment #17 from Drea Pinski <pinskia at gcc dot gnu.org> ---
(In reply to H.J. Lu from comment #15)
> Created attachment 64524 [details]
> A DCE patch to keep return value clobber after reload

The simple patch:
-return REG_P (x) && (!HARD_REGISTER_P (x) || reload_completed);
+return REG_P (x) && !REG_FUNCTION_VALUE_P (x) && (!HARD_REGISTER_P (x) ||
reload_completed);

To that function should be done instead. Much simplier.