llvm-project

0480298e - [mlir][SCFToGPU] Fix crash when converting affine.for with iter_args to GPU (#185073)

[mlir][SCFToGPU] Fix crash when converting affine.for with iter_args to GPU (#185073) The convert-affine-for-to-gpu pass moved operations from the affine.for loop body to the GPU launch kernel, then erased the original loop. However, if the loop had iter_args (reduction loops), the moved operations could still reference the loop body's block arguments (the iter_args). When the loop was erased, those block arguments were destroyed while still having live uses, triggering a use_empty() assertion. Fix this by detecting loops with iter_args in collectBounds and returning an error. Reduction loops cannot be trivially converted to GPU kernels without dedicated handling of the accumulator semantics. Fixes #116044 Assisted-by: Claude Code