[Bug rtl-optimization/71779] [5/6/7 regression] isl miscompiled with -mabi=ilp32

[pinskia at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=71779

Andrew Pinski <pinskia at gcc dot gnu.org> changed:

           What    |Removed                     |Added
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          Component|target                      |rtl-optimization

--- Comment #4 from Andrew Pinski <pinskia at gcc dot gnu.org> ---
BY the way it looks like combine:
> The next major change is after combine, which merges the zero_extract in with some other operations...

Should not have done that because of the way paradoxical subreg are defined as
not caring about the top bits of the register.