https://bugs.freedesktop.org/show_bug.cgi?id=90081
Bug ID: 90081
Summary: [llvmpipe] piglit
ext_transform_feedback-immediate-reuse-uniform-buffer
regression
Product: Mesa
Version: git
Hardware: x86-64 (AMD64)
OS: Linux (All)
Status: NEW
Keywords: bisected, regression
Severity: normal
Priority: medium
Component: Mesa core
Assignee: mesa-dev@lists.freedesktop.org
Reporter: v...@freedesktop.org
QA Contact: mesa-dev@lists.freedesktop.org
CC: jfons...@vmware.com, srol...@vmware.com
mesa: 1eac3ae1a6ebecf353054d937dd603a11ea33fb3 (master 10.6.0-devel)
$ ./bin/ext_transform_feedback-immediate-reuse-uniform-buffer -auto
Probe color at (16,0)
Expected: 0.062500 0.937500 0.062500
Observed: 0.000000 0.000000 0.000000
Probe color at (32,0)
Expected: 0.125000 0.875000 0.125000
Observed: 0.000000 0.000000 0.000000
Probe color at (48,0)
Expected: 0.187500 0.812500 0.187500
Observed: 0.000000 0.000000 0.000000
Probe color at (64,0)
Expected: 0.250000 0.750000 0.250000
Observed: 0.000000 0.000000 0.000000
Probe color at (80,0)
Expected: 0.312500 0.687500 0.312500
Observed: 0.000000 0.000000 0.000000
Probe color at (96,0)
Expected: 0.375000 0.625000 0.375000
Observed: 0.000000 0.000000 0.000000
Probe color at (112,0)
Expected: 0.437500 0.562500 0.437500
Observed: 0.000000 0.000000 0.000000
Probe color at (128,0)
Expected: 0.500000 0.500000 0.500000
Observed: 0.000000 0.000000 0.000000
Probe color at (144,0)
Expected: 0.562500 0.437500 0.562500
Observed: 0.000000 0.000000 0.000000
Probe color at (160,0)
Expected: 0.625000 0.375000 0.625000
Observed: 0.000000 0.000000 0.000000
Probe color at (176,0)
Expected: 0.687500 0.312500 0.687500
Observed: 0.000000 0.000000 0.000000
Probe color at (192,0)
Expected: 0.750000 0.250000 0.750000
Observed: 0.000000 0.000000 0.000000
Probe color at (208,0)
Expected: 0.812500 0.187500 0.812500
Observed: 0.000000 0.000000 0.000000
Probe color at (224,0)
Expected: 0.875000 0.125000 0.875000
Observed: 0.000000 0.000000 0.000000
Probe color at (240,0)
Expected: 0.937500 0.062500 0.937500
Observed: 0.000000 0.000000 0.000000
PIGLIT: {"result": "fail" }
586536a4e1c34725b3b38c3425db569fac0c91e9 is the first bad commit
commit 586536a4e1c34725b3b38c3425db569fac0c91e9
Author: Roland Scheidegger <srol...@vmware.com>
Date: Thu Apr 9 00:49:11 2015 +0200
gallivm: don't use control flow when doing indirect constant buffer lookups
llvm goes crazy when doing that, using way more memory and time, though
there's
probably more to it - this points to a very much similar issue as fixed in
8a9f5ecdb116d0449d63f7b94efbfa8b205d826f. In any case I've seen a quite
plain looking vertex shader with just ~50 simple tgsi instructions (but
with a
dozen or so such indirect constant buffer lookups) go from a terribly high
~440ms compile time (consuming 25MB of memory in the process) down to a
still
awful ~230ms and 13MB with this fix (with llvm 3.3), so there's still
obvious
improvements possible (but I have no clue why it's so slow...).
The resulting shader is most likely also faster (certainly seemed so though
I don't have any hard numbers as it may have been influenced by compile
times)
since generally fetching constants outside the buffer range is most likely
an
app error (that is we expect all indices to be valid).
It is possible this fixes some mysterious vertex shader slowdowns we've
seen
ever since we are conforming to newer apis at least partially (the main
draw
loop also has similar looking conditionals which we probably could do
without -
if not for the fetch at least for the additional elts condition.)
v2: use static vars for the fake bufs, minor code cleanups
Reviewed-by: Jose Fonseca <jfons...@vmware.com>
:040000 040000 3d9c36f85b3f7cf81413a06ea0454a4c035ea447
9d2ff2be20f10d6f129bc3e1a9979d2a97a37a79 M src
bisect run success
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