diff options
author | Rob Clark <[email protected]> | 2014-01-29 17:18:49 -0500 |
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committer | Rob Clark <[email protected]> | 2014-02-03 18:26:53 -0500 |
commit | 554f1ac00c43f4503b923e1a129c0039468dcb82 (patch) | |
tree | 1586ab27f83c704013d9f48b96d93434cd9644cc /src/gallium/drivers/nouveau/nouveau_fence.c | |
parent | f0e2d7ab4615651b40e37205bed12c9ca92e84f3 (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]>
Diffstat (limited to 'src/gallium/drivers/nouveau/nouveau_fence.c')
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