i965/fs: Take the shared mathbox into account in instruction scheduling.
I don't have evidence for this amounting to any improvement, but it does codify a bit more what we understand so far about the pipeline.
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@ -438,6 +438,21 @@ instruction_scheduler::schedule_instructions(fs_inst *next_block_header)
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instructions.push_tail(child);
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}
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}
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/* Shared resource: the mathbox. There's one per EU (on later
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* generations, it's even more limited pre-gen6), so if we send
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* something off to it then the next math isn't going to make
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* progress until the first is done.
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*/
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if (chosen->inst->is_math()) {
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foreach_iter(exec_list_iterator, iter, instructions) {
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schedule_node *n = (schedule_node *)iter.get();
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if (n->inst->is_math())
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n->unblocked_time = MAX2(n->unblocked_time,
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time + chosen->latency);
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}
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}
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}
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assert(instructions_to_schedule == 0);
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