diff --git a/src/freedreno/ir3/ir3_nir.c b/src/freedreno/ir3/ir3_nir.c
index 4afc86bf69d..9db831ad509 100644
--- a/src/freedreno/ir3/ir3_nir.c
+++ b/src/freedreno/ir3/ir3_nir.c
@@ -816,28 +816,8 @@ ir3_nir_post_finalize(struct ir3_shader *shader)
        * the "real" subgroup size.
        */
       unsigned subgroup_size = 0, max_subgroup_size = 0;
-      switch (shader->options.api_wavesize) {
-      case IR3_SINGLE_ONLY:
-         subgroup_size = max_subgroup_size = compiler->threadsize_base;
-         break;
-      case IR3_DOUBLE_ONLY:
-         subgroup_size = max_subgroup_size = compiler->threadsize_base * 2;
-         break;
-      case IR3_SINGLE_OR_DOUBLE:
-         /* For vertex stages, we know the wavesize will never be doubled.
-          * Lower subgroup_size here, to avoid having to deal with it when
-          * translating from NIR. Otherwise use the "real" wavesize obtained as
-          * a driver param.
-          */
-         if (s->info.stage != MESA_SHADER_COMPUTE &&
-             s->info.stage != MESA_SHADER_FRAGMENT) {
-            subgroup_size = max_subgroup_size = compiler->threadsize_base;
-         } else {
-            subgroup_size = 0;
-            max_subgroup_size = compiler->threadsize_base * 2;
-         }
-         break;
-      }
+      ir3_shader_get_subgroup_size(compiler, &shader->options, s->info.stage,
+                                   &subgroup_size, &max_subgroup_size);
 
       nir_lower_subgroups_options options = {
             .subgroup_size = subgroup_size,
diff --git a/src/freedreno/ir3/ir3_shader.c b/src/freedreno/ir3/ir3_shader.c
index b2f94b9daee..c3d5ede4160 100644
--- a/src/freedreno/ir3/ir3_shader.c
+++ b/src/freedreno/ir3/ir3_shader.c
@@ -990,6 +990,35 @@ ir3_shader_outputs(const struct ir3_shader *so)
    return so->nir->info.outputs_written;
 }
 
+void
+ir3_shader_get_subgroup_size(const struct ir3_compiler *compiler,
+                             const struct ir3_shader_options *options,
+                             gl_shader_stage stage, unsigned *subgroup_size,
+                             unsigned *max_subgroup_size)
+{
+   switch (options->api_wavesize) {
+   case IR3_SINGLE_ONLY:
+      *subgroup_size = *max_subgroup_size = compiler->threadsize_base;
+      break;
+   case IR3_DOUBLE_ONLY:
+      *subgroup_size = *max_subgroup_size = compiler->threadsize_base * 2;
+      break;
+   case IR3_SINGLE_OR_DOUBLE:
+      /* For vertex stages, we know the wavesize will never be doubled.
+       * Lower subgroup_size here, to avoid having to deal with it when
+       * translating from NIR. Otherwise use the "real" wavesize obtained as
+       * a driver param.
+       */
+      if (stage != MESA_SHADER_COMPUTE && stage != MESA_SHADER_FRAGMENT) {
+         *subgroup_size = *max_subgroup_size = compiler->threadsize_base;
+      } else {
+         *subgroup_size = 0;
+         *max_subgroup_size = compiler->threadsize_base * 2;
+      }
+      break;
+   }
+}
+
 /* Add any missing varyings needed for stream-out.  Otherwise varyings not
  * used by fragment shader will be stripped out.
  */
diff --git a/src/freedreno/ir3/ir3_shader.h b/src/freedreno/ir3/ir3_shader.h
index 8dd69b7113f..d61043ce26c 100644
--- a/src/freedreno/ir3/ir3_shader.h
+++ b/src/freedreno/ir3/ir3_shader.h
@@ -1075,6 +1075,12 @@ uint64_t ir3_shader_outputs(const struct ir3_shader *so);
 
 int ir3_glsl_type_size(const struct glsl_type *type, bool bindless);
 
+void ir3_shader_get_subgroup_size(const struct ir3_compiler *compiler,
+                                  const struct ir3_shader_options *options,
+                                  gl_shader_stage stage,
+                                  unsigned *subgroup_size,
+                                  unsigned *max_subgroup_size);
+
 /*
  * Helper/util:
  */