https://bugs.freedesktop.org/show_bug.cgi?id=107369
Bug ID: 107369
Summary: "volatile" in OpenCL code not recognized by POLARIS10
and KABINI
Product: Mesa
Version: 18.0
Hardware: x86-64 (AMD64)
OS: Linux (All)
Status: NEW
Severity: normal
Priority: medium
Component: Other
Assignee: mesa-dev@lists.freedesktop.org
Reporter: g...@sjeng.org
QA Contact: mesa-dev@lists.freedesktop.org
https://github.com/CNugteren/CLBlast/issues/298
https://github.com/gcp/leela-zero/issues/1612
Using "volatile" in OpenCL kernels will generate an "unsupported initializer
for address space" error for the combinations of:
Mesa 18.1.3 (POLARIS10, DRM 3.23.0, 4.16.0-1-amd64, LLVM 6.0.1)
Mesa 17.3.9 AMD KABINI (DRM 2.49.0 / 4.9.0-6-amd64, LLVM 5.0.1)
But works for:
Mesa 18.0.4 (POLARIS11 / DRM 3.23.0 / 4.16.13-1-MANJARO, LLVM 6.0.0)
Mesa 18.1.3 (POLARIS11, DRM 3.23.0, 4.16.18-1-MANJARO, LLVM 6.0.0)
So, this problem curiously seems to avoided by the POLARIS11 OpenCL support and
not specific to the Mesa version itself.
volatile has been legal in OpenCL code at least since OpenCL 1.1 and is used in
the above projects to improve register allocation (without which AMD hardware
gets a performance penalty).
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