Mesa 19.3.0 Not Expected Until December - RC4 Released With ACO Fixes

Mesa 19.3-RC4 brings a number of fixes to the recently merged "ACO" compiler back-end for the RADV Vulkan driver that was developed by Valve. Mesa 19.3 is the first release with this ACO back-end in mainline and looks to be in good shape for those wanting to flip it on with a RADV_PERFTEST=aco environment variable.
In addition to a number of ACO fixes, there are also some fixes to the Freedreno driver, Intel ANV Vulkan, the NIR intermediate representation code, fixing Unigine Sanctuary/Tropics rendering in the common Mesa state tracker code by blacklisting ARB_gpu_shader5 for those binaries, and other fixes.
Mesa 19.3-RC5 is expected next week while if all goes well Mesa 19.3.0 could then ship on 4 December. If not, it's 19.3-RC6 and then hopefully the official release would be ready one week later as to not interfere with the Christmas holidays.
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