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ac25cf55af
There are several common ways to check whether an object is a particular subclass: dynamic_cast<>, the as_subclass() pattern, or explicit enum tags. We originally used the virtual as_subclass methods, but later added enum tags as they are much nicer for debugging. Since we have the enum tags, we don't necessarily need to use virtual functions to implement the as_subclass() methods. We can just check the tag and return the pointer or NULL. This saves 18 entries in the vtable, and instead of two pointer dereferences per as_subclass() call most are only three inline instructions. Compile time of sam3/112.frag (the longest compile in a recent shader-db run) is reduced by 5% from 348 to 329 ms (n=500). perf stat of this workload shows: 24.14% reduction in iTLB-loads: 285,543 -> 216,606 42.55% reduction in iTLB-load-misses: 18,785 -> 10,792 Reviewed-by: Juha-Pekka Heikkila <juhapekka.heikkila@gmail.com> |
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| loader | ||
| mapi | ||
| mesa | ||
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