[Bug rtl-optimization/117770] FAIL: g++.dg/torture/pr37922.C -O3 -fomit-frame-pointer -funroll-loops -fpeel-loops -ftracer -finline-functions execution test

[vmakarov at gcc dot gnu.org via Gcc-bugs]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=117770

--- Comment #4 from Vladimir Makarov <vmakarov at gcc dot gnu.org> ---
(In reply to John David Anglin from comment #3)
> I suspect explicitly setting hard registers prior to reload confuses
> LRA:
> 
> ;;; Division and mod.
> (define_expand "divsi3"
>   [(set (reg:SI 26) (match_operand:SI 1 "move_src_operand" ""))
>    (set (reg:SI 25) (match_operand:SI 2 "move_src_operand" ""))
>    (parallel [(set (reg:SI 29) (div:SI (reg:SI 26) (reg:SI 25)))
>               (clobber (match_dup 3))
>               (clobber (match_dup 4))
>               (clobber (reg:SI 26))
>               (clobber (reg:SI 25))
>               (clobber (match_dup 5))])
>    (set (match_operand:SI 0 "move_dest_operand" "") (reg:SI 29))]

Thank you for your report and detail analysis.

I'll work on it as it might be a general problem affecting some other targets.