When noce_convert_multiple is called the original costs are not yet
initialized. Therefore, up to now, costs were only ever unfairly
compared against COSTS_N_INSNS (2). This would lead to
default_noce_conversion_profitable_p () rejecting all but the most
contrived of sequences.
This patch tempor
Robin Dapp writes:
> When noce_convert_multiple is called the original costs are not yet
> initialized. Therefore, up to now, costs were only ever unfairly
> compared against COSTS_N_INSNS (2). This would lead to
> default_noce_conversion_profitable_p () rejecting all but the most
> contrived of
It looks like this is an existing (potential) problem,
but default_noce_conversion_profitable_p uses seq_cost, which in turn
uses insn_cost. And insn_cost has an optional target hook behind it,
which allows for costing based on insn attributes etc. For a true
apples-with-apples comparison we sho
Robin Dapp writes:
>> It looks like this is an existing (potential) problem,
>> but default_noce_conversion_profitable_p uses seq_cost, which in turn
>> uses insn_cost. And insn_cost has an optional target hook behind it,
>> which allows for costing based on insn attributes etc. For a true
>> ap
