[Bug tree-optimization/98960] Failure to optimize accumulate loop to mul
rguenth at gcc dot gnu.org
gcc-bugzilla@gcc.gnu.org
Thu Feb 4 07:55:27 GMT 2021
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=98960
Richard Biener <rguenth at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|UNCONFIRMED |NEW
Ever confirmed|0 |1
Last reconfirmed| |2021-02-04
--- Comment #1 from Richard Biener <rguenth at gcc dot gnu.org> ---
Final value replacement has
(set_scalar_evolution
instantiated_below = 5
(scalar = sum_7)
(scalar_evolution = {0, +, {1, +, 1}_1}_1))
)
(chrec_apply
(varying_loop = 1
)
(chrec = {0, +, {1, +, 1}_1}_1)
(x = (unsigned int) max_value_4(D) + 4294967295)
(res = scev_not_known))
not replacing:
sum_1 = PHI <sum_7(3)>
because it doesn't know this (IIRC there's a duplicate bug where I tried some
things to handle this).
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