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authorRob Clark <[email protected]>2014-01-29 17:18:49 -0500
committerRob Clark <[email protected]>2014-02-03 18:26:53 -0500
commit554f1ac00c43f4503b923e1a129c0039468dcb82 (patch)
tree1586ab27f83c704013d9f48b96d93434cd9644cc /src/gallium/drivers/nouveau/nouveau_fence.c
parentf0e2d7ab4615651b40e37205bed12c9ca92e84f3 (diff)
freedreno/a3xx/compiler: new compiler
The new compiler generates a dependency graph of instructions, including a few meta-instructions to handle PHI and preserve some extra information needed for register assignment, etc. The depth pass assigned a weight/depth to each node (based on sum of instruction cycles of a given node and all it's dependent nodes), which is used to schedule instructions. The scheduling takes into account the minimum number of cycles/slots between dependent instructions, etc. Which was something that could not be handled properly with the original compiler (which was more of a naive TGSI translator than an actual compiler). The register assignment is currently split out as a standalone pass. I expect that it will be replaced at some point, once I figure out what to do about relative addressing (which is currently the only thing that should cause fallback to old compiler). There are a couple new debug options for FD_MESA_DEBUG env var: optmsgs - enable debug prints in optimizer optdump - dump instruction graph in .dot format, for example: http://people.freedesktop.org/~robclark/a3xx/frag-0000.dot.png http://people.freedesktop.org/~robclark/a3xx/frag-0000.dot At this point, thanks to proper handling of instruction scheduling, the new compiler fixes a lot of things that were broken before, and does not appear to break anything that was working before[1]. So even though it is not finished, it seems useful to merge it in it's current state. [1] Not merged in this commit, because I'm not sure if it really belongs in mesa tree, but the following commit implements a simple shader emulator, which I've used to compare the output of the new compiler to the original compiler (ie. run it on all the TGSI shaders dumped out via ST_DEBUG=tgsi with various games/apps): https://github.com/freedreno/mesa/commit/163b6306b1660e05ece2f00d264a8393d99b6f12 Signed-off-by: Rob Clark <[email protected]>
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