Re: [PATCH 1/3] rtl-ssa: Use frequency-weighted insn costs

2023-10-24 Thread Jeff Law
On 10/24/23 11:58, Richard Sandiford wrote: rtl_ssa::changes_are_worthwhile used the standard approach of summing up the individual costs of the old and new sequences to see which one is better overall. But when optimising for speed and changing instructions in multiple blocks, it seems bette

[PATCH 1/3] rtl-ssa: Use frequency-weighted insn costs

2023-10-24 Thread Richard Sandiford
rtl_ssa::changes_are_worthwhile used the standard approach of summing up the individual costs of the old and new sequences to see which one is better overall. But when optimising for speed and changing instructions in multiple blocks, it seems better to weight the cost of each instruction by its e