nir: move lowering of SYSTEM_VALUE_LOCAL_GROUP_SIZE into a function

we already have this code duplicated and we will need it for the global
group size as well

Reviewed-by: Jason Ekstrand <jason@jlekstrand.net>
Signed-off-by: Karol Herbst <kherbst@redhat.com>

diff --git a/src/compiler/nir/nir_lower_system_values.c b/src/compiler/nir/nir_lower_system_values.c
index f315b7a..e836798 100644 (file)
--- a/src/compiler/nir/nir_lower_system_values.c
+++ b/src/compiler/nir/nir_lower_system_values.c
@@ -28,6 +28,17 @@
 #include "nir.h"
 #include "nir_builder.h"
 
+static nir_ssa_def*
+build_local_group_size(nir_builder *b)
+{
+   nir_const_value local_size;
+   memset(&local_size, 0, sizeof(local_size));
+   local_size.u32[0] = b->shader->info.cs.local_size[0];
+   local_size.u32[1] = b->shader->info.cs.local_size[1];
+   local_size.u32[2] = b->shader->info.cs.local_size[2];
+   return nir_build_imm(b, 3, 32, local_size);
+}
+
 static bool
 convert_block(nir_block *block, nir_builder *b)
 {
@@ -66,19 +77,11 @@ convert_block(nir_block *block, nir_builder *b)
           *    "The value of gl_GlobalInvocationID is equal to
           *    gl_WorkGroupID * gl_WorkGroupSize + gl_LocalInvocationID"
           */
-
-         nir_const_value local_size;
-         memset(&local_size, 0, sizeof(local_size));
-         local_size.u32[0] = b->shader->info.cs.local_size[0];
-         local_size.u32[1] = b->shader->info.cs.local_size[1];
-         local_size.u32[2] = b->shader->info.cs.local_size[2];
-
+         nir_ssa_def *group_size = build_local_group_size(b);
          nir_ssa_def *group_id = nir_load_work_group_id(b);
          nir_ssa_def *local_id = nir_load_local_invocation_id(b);
 
-         sysval = nir_iadd(b, nir_imul(b, group_id,
-                                       nir_build_imm(b, 3, 32, local_size)),
-                              local_id);
+         sysval = nir_iadd(b, nir_imul(b, group_id, group_size), local_id);
          break;
       }
 
@@ -112,12 +115,7 @@ convert_block(nir_block *block, nir_builder *b)
       }
 
       case SYSTEM_VALUE_LOCAL_GROUP_SIZE: {
-         nir_const_value local_size;
-         memset(&local_size, 0, sizeof(local_size));
-         local_size.u32[0] = b->shader->info.cs.local_size[0];
-         local_size.u32[1] = b->shader->info.cs.local_size[1];
-         local_size.u32[2] = b->shader->info.cs.local_size[2];
-         sysval = nir_build_imm(b, 3, 32, local_size);
+         sysval = build_local_group_size(b);
          break;
       }