https://bugs.freedesktop.org/show_bug.cgi?id=108841
Bug ID: 108841
Summary: [RADV] SPIRV's control flow attributes do not
propagate to LLVM
Product: Mesa
Version: git
Hardware: x86-64 (AMD64)
OS: Linux (All)
Status: NEW
Severity: normal
Priority: medium
Component: Drivers/Vulkan/radeon
Assignee: mesa-dev@lists.freedesktop.org
Reporter: godl...@ancient-ritual.com
QA Contact: mesa-dev@lists.freedesktop.org
Hi,
SPIR-V already supports control flow attributes (see SpvLoopControlMask and
SpvSelectionControlMask).
There is the GL_EXT_control_flow_attributes extension that exposes those in
GLSL and glslang already implements it. glslang's also implements them in its
HLSL backend.
When I use those attributes in a project of mine I observe some nice reduction
in VGPR usage on AMDVLK. In RADV though I see no difference.
I greped in mesa for those parameters and I didn't find any code using them.
Is it possible to add support?
Apart from my selfish reasons for asking this, I'd like to mention that DX11
games running through wine/proton/DXVK layers would probably make use of them
since HLSL supported those for quite some time already.
Thanks.
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