Route CUDA crossover effective bounds through GPUSparseMatrixCSR.

Buildkite runs cuSPARSE CuSparseMatrixCSR solves; dispatch crossover row
kernels via a thin wrapper in CoolPDLPCUDAExt.

Author: Charles Vielzeuf

ext/CoolPDLPCUDAExt.jl

@@ -1,11 +1,26 @@
 module CoolPDLPCUDAExt
 
 using CUDA: CUDA  # not used for now
-using cuSPARSE: CuSparseMatrixCOO
-using CoolPDLP: CoolPDLP
+using cuSPARSE: CuSparseMatrixCOO, CuSparseMatrixCSR
+using CoolPDLP: CoolPDLP, GPUSparseMatrixCSR, _crossover_effective_bounds!
 
 function CoolPDLP.sametype_transpose(A::CuSparseMatrixCOO)
     return CuSparseMatrixCOO(A.colInd, A.rowInd, A.nzVal, (A.dims[2], A.dims[1]), A.nnz)
 end
 
+function CoolPDLP._crossover_effective_bounds!(
+        lv_eff,
+        uv_eff,
+        A::CuSparseMatrixCSR,
+        lc,
+        uc,
+        x,
+        at_box;
+        eq_atol::Real = 1.0e-12,
+    )
+    m, n = A.dims
+    A_csr = GPUSparseMatrixCSR(m, n, A.rowPtr, A.colVal, A.nzVal)
+    return _crossover_effective_bounds!(lv_eff, uv_eff, A_csr, lc, uc, x, at_box; eq_atol)
+end
+
 end