[Kernel] Remove if-else with identical branches in marlin 2:4 (vllm-p…

…roject#10687)

Signed-off-by: Tyler Michael Smith <[email protected]>
Signed-off-by: Andrew Feldman <[email protected]>

csrc/quantization/marlin/sparse/marlin_24_cuda_kernel.cu

@@ -296,13 +296,9 @@ __global__ void Marlin_24(
   // We use a different scale layout for grouped and column-wise quantization as
   // we scale a `half2` tile in column-major layout in the former and in
   // row-major in the latter case.
-  if (group_blocks != -1) {
-    s_sh_rd = 8 * ((threadIdx.x / 32) % (thread_n_blocks / 4)) +
-              (threadIdx.x % 32) / 4;
-  } else {
-    s_sh_rd = 8 * ((threadIdx.x / 32) % (thread_n_blocks / 4)) +
-              (threadIdx.x % 32) / 4;
-  }
+  s_sh_rd = 8 * ((threadIdx.x / 32) % (thread_n_blocks / 4)) +
+            (threadIdx.x % 32) / 4;  // Note that in the original Marlin kernel
+                                     // this is (threadIdx.x % 32) / 4
 
   // Precompute which thread should not read memory in which iterations; this is
   // needed if there are more threads than required for a certain tilesize or