Files
clang-p2996/llvm
Nicolai Hähnle 3bee9ba015 AMDGPU/GFX12: Fix s_barrier_signal_isfirst for single-wave workgroups (#143634)
Barrier instructions are no-ops in single-wave workgroups. This includes
s_barrier_signal_isfirst, which will leave SCC unmodified.

Model this correctly (via an implicit use of SCC) and ensure SCC==1
before the barrier instruction (if the wave is the only one of the
workgroup, then it is the first).

---------

Co-authored-by: Matt Arsenault <arsenm2@gmail.com>
2025-06-19 11:22:49 -07:00
..

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