[Bug tree-optimization/66012] Sub-optimal 64bit load is generated instead of zero-extension

[pinskia at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=66012

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

           What    |Removed                     |Added
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   Last reconfirmed|2015-12-23 00:00:00         |2016-9-21

--- Comment #4 from Andrew Pinski <pinskia at gcc dot gnu.org> ---
On the trunk we generate one 32bit load and one 64bit load (at least for
aarch64):
test:
        adrp    x0, l
        add     x1, x0, :lo12:l
        ldr     w0, [x0, #:lo12:l]   ; 32bit load to w0
        ldr     x1, [x1, 8]          ; 64bit load to x1
        orr     x0, x0, x1, lsl 32
        ret