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[Bug tree-optimization/66012] Sub-optimal 64bit load is generated instead of zero-extension
- From: "pinskia at gcc dot gnu.org" <gcc-bugzilla at gcc dot gnu dot org>
- To: gcc-bugs at gcc dot gnu dot org
- Date: Wed, 21 Sep 2016 09:17:56 +0000
- Subject: [Bug tree-optimization/66012] Sub-optimal 64bit load is generated instead of zero-extension
- Auto-submitted: auto-generated
- References: <bug-66012-4@http.gcc.gnu.org/bugzilla/>
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=66012
Andrew Pinski <pinskia at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
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