intel/compiler: extract brw_nir_load_global_const out of rt code

Signed-off-by: Marcin Ślusarz <marcin.slusarz@intel.com>
Reviewed-by: Lionel Landwerlin <lionel.g.landwerlin@intel.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/13661>

src/intel/compiler/brw_nir.c

@@ -1535,3 +1535,49 @@ brw_nir_create_passthrough_tcs(void *mem_ctx, const struct brw_compiler *compile
 
    return nir;
 }
+
+nir_ssa_def *
+brw_nir_load_global_const(nir_builder *b, nir_intrinsic_instr *load_uniform,
+      nir_ssa_def *base_addr, unsigned off)
+{
+   assert(load_uniform->intrinsic == nir_intrinsic_load_uniform);
+   assert(load_uniform->dest.is_ssa);
+   assert(load_uniform->src[0].is_ssa);
+
+   unsigned bit_size = load_uniform->dest.ssa.bit_size;
+   assert(bit_size >= 8 && bit_size % 8 == 0);
+   unsigned byte_size = bit_size / 8;
+   nir_ssa_def *sysval;
+
+   if (nir_src_is_const(load_uniform->src[0])) {
+      uint64_t offset = off +
+                        nir_intrinsic_base(load_uniform) +
+                        nir_src_as_uint(load_uniform->src[0]);
+
+      /* Things should be component-aligned. */
+      assert(offset % byte_size == 0);
+
+      unsigned suboffset = offset % 64;
+      uint64_t aligned_offset = offset - suboffset;
+
+      /* Load two just in case we go over a 64B boundary */
+      nir_ssa_def *data[2];
+      for (unsigned i = 0; i < 2; i++) {
+         nir_ssa_def *addr = nir_iadd_imm(b, base_addr, aligned_offset + i * 64);
+         data[i] = nir_load_global_const_block_intel(b, 16, addr,
+                                                     nir_imm_true(b));
+      }
+
+      sysval = nir_extract_bits(b, data, 2, suboffset * 8,
+                                load_uniform->num_components, bit_size);
+   } else {
+      nir_ssa_def *offset32 =
+         nir_iadd_imm(b, load_uniform->src[0].ssa,
+                         off + nir_intrinsic_base(load_uniform));
+      nir_ssa_def *addr = nir_iadd(b, base_addr, nir_u2u64(b, offset32));
+      sysval = nir_load_global_constant(b, addr, byte_size,
+                                        load_uniform->num_components, bit_size);
+   }
+
+   return sysval;
+}

src/intel/compiler/brw_nir.h

@@ -27,6 +27,7 @@
 #include "brw_reg.h"
 #include "compiler/nir/nir.h"
 #include "brw_compiler.h"
+#include "nir_builder.h"
 
 #ifdef __cplusplus
 extern "C" {
@@ -191,6 +192,10 @@ nir_shader *brw_nir_create_passthrough_tcs(void *mem_ctx,
 
 bool brw_nir_move_interpolation_to_top(nir_shader *nir);
 bool brw_nir_demote_sample_qualifiers(nir_shader *nir);
+nir_ssa_def *brw_nir_load_global_const(nir_builder *b,
+                                       nir_intrinsic_instr *load_uniform,
+                                       nir_ssa_def *base_addr,
+                                       unsigned off);
 
 #ifdef __cplusplus
 }

src/intel/compiler/brw_nir_lower_rt_intrinsics.c

@@ -140,47 +140,10 @@ lower_rt_intrinsics_impl(nir_function_impl *impl,
             if (stage == MESA_SHADER_COMPUTE)
                break;
 
-            assert(intrin->dest.is_ssa);
+            sysval = brw_nir_load_global_const(b, intrin,
-            assert(intrin->src[0].is_ssa);
+                        nir_load_btd_global_arg_addr_intel(b),
+                        BRW_RT_PUSH_CONST_OFFSET);
 
-            unsigned bit_size = intrin->dest.ssa.bit_size;
-            assert(bit_size >= 8 && bit_size % 8 == 0);
-            unsigned byte_size = bit_size / 8;
-
-            if (nir_src_is_const(intrin->src[0])) {
-               uint64_t offset = BRW_RT_PUSH_CONST_OFFSET +
-                                 nir_intrinsic_base(intrin) +
-                                 nir_src_as_uint(intrin->src[0]);
-
-               /* Things should be component-aligned. */
-               assert(offset % byte_size == 0);
-
-               unsigned suboffset = offset % 64;
-               uint64_t aligned_offset = offset - suboffset;
-
-               /* Load two just in case we go over a 64B boundary */
-               nir_ssa_def *data[2];
-               for (unsigned i = 0; i < 2; i++) {
-                  nir_ssa_def *addr =
-                     nir_iadd_imm(b, nir_load_btd_global_arg_addr_intel(b),
-                                     aligned_offset + i * 64);
-                  data[i] = nir_load_global_const_block_intel(b, 16, addr,
-                                                              nir_imm_true(b));
-               }
-
-               sysval = nir_extract_bits(b, data, 2, suboffset * 8,
-                                         intrin->num_components, bit_size);
-            } else {
-               nir_ssa_def *offset32 =
-                  nir_iadd_imm(b, intrin->src[0].ssa,
-                                  BRW_RT_PUSH_CONST_OFFSET +
-                                  nir_intrinsic_base(intrin));
-               nir_ssa_def *addr =
-                  nir_iadd(b, nir_load_btd_global_arg_addr_intel(b),
-                              nir_u2u64(b, offset32));
-               sysval = nir_load_global_constant(b, addr, byte_size,
-                                                 intrin->num_components, bit_size);
-            }
             break;
          }