Bug 95038

Summary:	atomic_add and atomic_or cause a OpenCL crashes
Product:	Mesa	Reporter:	rosenp
Component:	Other	Assignee:	mesa-dev
Status:	RESOLVED FIXED	QA Contact:	mesa-dev
Severity:	normal
Priority:	medium
Version:	11.2
Hardware:	x86-64 (AMD64)
OS:	Linux (All)
Whiteboard:
i915 platform:		i915 features:

Description rosenp 2016-04-20 19:06:01 UTC

No real idea if this is an issue for LLVM or for Mesa but on my r600g GPU(6520g) LLVM crashes when compiling an opencl kernel that uses either atomic_add or atomic_or. On LLVM 3.8 and mesa 11.2

Comment 1 Aaron Watry 2016-04-20 20:34:11 UTC

Are the atomic_add/atomic_or operations causing the crash operating against local or global memory?

Last I checked, I think that atomics for r600g-based cards were only implemented in LLVM for the local memory space (while SI+ have both local/global implemented).

Someone may have gotten around to implementing support for global atomics for Evergreen/NI in LLVM while I wasn't looking, but I have no knowledge of it having been done.

Comment 2 rosenp 2016-04-20 20:53:30 UTC

it's for global memory. looks like it's unimplemented according to the galliumcompute chart. Oh well.

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