49ba4fdeb6
The following makes the backward threader reject threads whose entry
edge is probably never executed according to the profile. That in
particular, for the testcase, avoids threading the irq == 1 check
on the path where irq > 31, thereby avoiding spurious -Warray-bounds
diagnostics
if (irq_1(D) > 31)
goto <bb 3>; [0.00%]
else
goto <bb 4>; [100.00%]
;; basic block 3, loop depth 0, count 0 (precise), probably never executed
_2 = (unsigned long) irq_1(D);
__builtin___ubsan_handle_shift_out_of_bounds (&*.Lubsan_data0, 1, _2);
_3 = 1 << irq_1(D);
mask_4 = (u32) _3;
entry = instance_5(D)->array[irq_1(D)];
capture (mask_4);
if (level_6(D) != 0)
goto <bb 7>; [34.00%]
else
goto <bb 5>; [66.00%]
;; basic block 5, loop depth 0, count 708669600 (estimated locally), maybe hot if (irq_1(D) == 1)
goto <bb 7>; [20.97%]
else
goto <bb 6>; [79.03%]
PR tree-optimization/105679
* tree-ssa-threadbackward.cc
(back_threader_profitability::profitable_path_p): Avoid threading
when the entry edge is probably never executed.
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