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authorEric Anholt <[email protected]>2017-01-05 15:11:30 -0800
committerEric Anholt <[email protected]>2017-01-26 12:48:10 -0800
commit4d30024238efa829cabc72c1601beeee18c3dbf2 (patch)
tree09f04f006eb015b3cc5940eddde461519114f77a /install-gallium-links.mk
parent347b69e7d74f61f3b08853ccdfad72bdae683e12 (diff)
vc4: Use NEON to speed up utile loads on Pi2.
We had a lot of memcpy call overhead because gpu_stride wasn't being inlined. But if you split out the stride==8 and stride==16 cases like this code does while still using memcpy, you'd no longer have glibc's NEON memcpy applied at which point we'd be doing 16 uncached reads instead of 64/(NEON memcpy granularity), for about a 30% performance hit. By hand writing the assembly, we can get a whole cacheline loaded at a time. Unfortunately, NEON intrinsics turned out to be unusable -- they didn't have the vldm instruction available. Note that, for now, the NEON code is only enabled when building for ARMv7 (Pi 2+). We may want to do runtime detection for the Raspbian case, in the future. Improves 1024x1024 GetTexImage by 208.256% +/- 7.07029% (n=10).
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