- if ((devinfo->gen >= 8 || devinfo->is_haswell) && is_scalar) {
- /* TODO: Yes, we could in theory do this on gen6 and earlier. However,
- * that would require plumbing through support for these indirect
- * scratch read/write messages with message registers and that's just a
- * pain. Also, the primary benefit of this is for compute shaders which
- * won't run on gen6 and earlier anyway.
- *
- * On gen7 and earlier the scratch space size is limited to 12kB.
- * By enabling this optimization we may easily exceed this limit without
- * having any fallback.
- *
- * The threshold of 128B was chosen semi-arbitrarily. The idea is that
- * 128B per channel on a SIMD8 program is 32 registers or 25% of the
- * register file. Any array that large is likely to cause pressure
- * issues. Also, this value is sufficiently high that the benchmarks
- * known to suffer from large temporary array issues are helped but
- * nothing else in shader-db is hurt except for maybe that one kerbal
- * space program shader.
- */
- OPT(nir_lower_vars_to_scratch, nir_var_function_temp, 128,
- glsl_get_natural_size_align_bytes);
- }
-