[Bug tree-optimization/105254] ICE in exact_div, at poly-int.h:2219
cvs-commit at gcc dot gnu.org
gcc-bugzilla@gcc.gnu.org
Thu Jun 23 02:25:22 GMT 2022
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=105254
--- Comment #7 from CVS Commits <cvs-commit at gcc dot gnu.org> ---
The releases/gcc-12 branch has been updated by Kewen Lin <linkw@gcc.gnu.org>:
https://gcc.gnu.org/g:bb1a6d92989a50df13b1a21085c86625089c9e53
commit r12-8505-gbb1a6d92989a50df13b1a21085c86625089c9e53
Author: Richard Sandiford <richard.sandiford@arm.com>
Date: Wed Jun 15 11:12:51 2022 +0100
aarch64: Revert bogus fix for PR105254
In f2ebf2d98efe0ac2314b58cf474f44cb8ebd5244 I'd forced the
chosen unroll factor to be a factor of the VF, in order to
work around an exact_div ICE in PR105254. This was completely
bogus -- clearly I didn't look in enough detail at why we ended
up with an unrolled VF that wasn't a multiple of the UF.
Kewen has since fixed the bug properly for PR105940, so this
patch reverts my earlier attempt. Sorry for the stupidity.
gcc/
PR tree-optimization/105254
PR tree-optimization/105940
Revert:
* config/aarch64/aarch64.cc
(aarch64_vector_costs::determine_suggested_unroll_factor): Take a
loop_vec_info as argument. Restrict the unroll factor to values
that divide the VF.
(aarch64_vector_costs::finish_cost): Update call accordingly.
gcc/testsuite/
* gcc.target/aarch64/sve/cost_model_14.c: New test.
(cherry picked from commit 2636660b6f35423e0cfbf53bfad5c5fed6ae6471)
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