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Fix build with LLVM 23 for gfx942 and gfx950
LLVM 23 fails with "Cannot scavenge register in FI elimination" on some
kernels (fixed by llvm/llvm-project@c003bfba6158); together, disabling the
machine scheduler and the basic SGPR allocator avoid it.
Bug: https://bugs.gentoo.org/984543
--- a/cmake/DeviceLinker.cmake
+++ b/cmake/DeviceLinker.cmake
@@ -288,6 +288,9 @@ foreach(DL_GPU_TARGET ${DL_GPU_TARGETS})
-fPIC
${DL_INHERITED_FLAGS}
)
+ if(DL_GPU_TARGET MATCHES "^gfx9(42|50)$")
+ target_compile_options(${_dev_target} PRIVATE -mllvm=-enable-misched=false -mllvm=-sgpr-regalloc=basic)
+ endif()
target_compile_definitions(${_dev_target} PRIVATE RCCL_DEVICE_LINKER)
target_link_libraries(${_dev_target} PRIVATE rccl_device_defs)
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