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* [Bug tree-optimization/88542] Optimize symmetric range check
[not found] <bug-88542-4@http.gcc.gnu.org/bugzilla/>
@ 2021-11-17 9:23 ` pinskia at gcc dot gnu.org
0 siblings, 0 replies; only message in thread
From: pinskia at gcc dot gnu.org @ 2021-11-17 9:23 UTC (permalink / raw)
To: gcc-bugs
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=88542
--- Comment #4 from Andrew Pinski <pinskia at gcc dot gnu.org> ---
(In reply to Richard Biener from comment #3)
> not sure why that only happens in the last phiopt pass. Ah, because
> the main phiopt pass sees the following:
>
> <bb 2> [local count: 1073741825]:
> if (d_3(D) < max_4(D))
> goto <bb 3>; [50.00%]
> else
> goto <bb 4>; [50.00%]
>
> <bb 3> [local count: 536870912]:
> _1 = -max_4(D);
> if (_1 < d_3(D))
> goto <bb 5>; [50.00%]
> else
> goto <bb 4>; [50.00%]
>
> <bb 4> [local count: 805306368]:
>
> <bb 5> [local count: 1073741825]:
> # iftmp.0_2 = PHI <1(3), 0(4)>
The above issue of not doing the phiopt early was solved finally by
r12-5300-gf98f373dd822b35c.
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[not found] <bug-88542-4@http.gcc.gnu.org/bugzilla/>
2021-11-17 9:23 ` [Bug tree-optimization/88542] Optimize symmetric range check pinskia at gcc dot gnu.org
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