https://gcc.gnu.org/bugzilla/show_bug.cgi?id=60172
Thomas Preud'homme <thopre01 at gcc dot gnu.org> changed:
What |Removed |Added
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CC| |thopre01 at gcc dot gnu.org
--- Comment #29 from Thomas Preud'homme <thopre01 at gcc dot gnu.org> ---
(In reply to Richard Biener from comment #28)
> For GCC 6 we now have a DCE right before RTL expansion so what's the status
> of this bug for GCC6/7?
The RTL expansion looks better with:
20: r127=r132<<0x2
21: r137=r125+r127
22: r126=r131+r137 // r126=r131+r125+r127
29: r140=r131+r125
30: r141=r140+r127 // r141=r131+r125+r127
31: r142=r141+1000
32: [r142+20]=r123
So there should be a clear CSE opportunity to replace r141 by r126. Yet this
does not happen at cse1. Beside, gimple before expand is different so I cannot
really confirmed that the changes at expand actually fixed the issue.
I think the ticket can be closed and we'll reopen it if needed.
Best regards,
Thomas
