Eric Botcazou wrote: >> CONFIG_FPU_ENABLE Y/N would correspond to --with-float=hard/soft, and >> I believe setting CONFIG_IU_V8MULDIV to Y/N requires --with-cpu=V8/V7, >> is that correct? I think it would make sense to build these as multilibs, >> so the user can experiment to find out performance impacts of >> the various hardware configurations on generated code. >> >> I wonder if it also would be worthwhile to have compiler options >> for fpu=fast/slow and multiply=fast/slow, so we can schedule >> appropriately. For the FPU, issue-rate/latency are as follows: >> GR FPU: 1/4, with FDIV? 16 and FSQRT? 24 cycles, >> non-pipelined on separate unit >> GR FPU Lite: 8/8, with FDIVS/FDIVD/FSQRTS/FSQRTD 31/57/46/57 cycles, >> non-pipelined on same unit > > Let's not make this too complex for a first try, the settings used at AdaCore > seem a good starting point to me. >
I Agree
