Hi,
On 13-11-15 19:51, Tom Stellard wrote:
On Fri, Nov 13, 2015 at 02:46:52PM +0100, Hans de Goede wrote:
Hi All,
So as discussed I've started working on a TGSI backend for
llvm to use as a way to get compute going on nouveau (and other gpu-s).
I'm still learning all the ins and outs of llvm so I do not have
much to show yet.
I've rebased Francisco's (curro's) latest version on top of llvm
trunk, and added a commit on top to actual get it build with the
latest trunk. So currently I'm at the point where I've just
taken Francisco's code, and made it compile, no more and no less.
I have a git repo with this work available here:
http://cgit.freedesktop.org/~jwrdegoede/llvm/
So the next step would be to test this and see if it actually
does anything, questions:
1) Does anyone have a simple test case / command where I can
invoke just llvm and get TGSI asm output to check ?
The easiest way to do this is with the llc tool which ships with llvm.
It compiles LLVM IR to target code, which in this case is tgsi.
I would recommend taking one of the simple examples from
test/CodeGen/AMDGPU (you may need to get these from llvm trunk, not sure
what llvm version you are using).
To use llc:
llc -march=tgsi input.ll -o -
This will output TGSI.
If you want to use clang to compile OpenCL C kernels to clang you will
need to teach clang about the TGSI target by implementing the a
sub-class of TargetInfo in lib/Basic/Targets.cpp. Look at the
AMDGPU target for examples, but I recommend starting with llc.
2) Assuming I get the above to (somewhat) work, is there a
way to make llvm show the output of the various intermediate
passes in a human readable form ?
You can pass -print-before-all or -print-after-all to dump the
intermediate forms.
Thanks this is exactly what I was looking for. I'll send another
status update when I've something worthwhile to report :)
Regards,
Hans
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