ac/radv: move lower_indirect_derefs() to ac_nir_to_llvm.c

Until llvm handles indirects better we will need to use these
workarounds in the radeonsi backend also.

Reviewed-by: Bas Nieuwenhuizen <bas@basnieuwenhuizen.nl>

src/amd/common/ac_nir_to_llvm.c

@@ -7312,3 +7312,40 @@ void ac_create_gs_copy_shader(LLVMTargetMachineRef tm,
 			       MESA_SHADER_VERTEX,
 			       dump_shader, options->supports_spill);
 }
+
+void
+ac_lower_indirect_derefs(struct nir_shader *nir, enum chip_class chip_class)
+{
+	/* While it would be nice not to have this flag, we are constrained
+	 * by the reality that LLVM 5.0 doesn't have working VGPR indexing
+	 * on GFX9.
+	 */
+	bool llvm_has_working_vgpr_indexing = chip_class <= VI;
+
+	/* TODO: Indirect indexing of GS inputs is unimplemented.
+	 *
+	 * TCS and TES load inputs directly from LDS or offchip memory, so
+	 * indirect indexing is trivial.
+	 */
+	nir_variable_mode indirect_mask = 0;
+	if (nir->info.stage == MESA_SHADER_GEOMETRY ||
+	    (nir->info.stage != MESA_SHADER_TESS_CTRL &&
+	     nir->info.stage != MESA_SHADER_TESS_EVAL &&
+	     !llvm_has_working_vgpr_indexing)) {
+		indirect_mask |= nir_var_shader_in;
+	}
+	if (!llvm_has_working_vgpr_indexing &&
+	    nir->info.stage != MESA_SHADER_TESS_CTRL)
+		indirect_mask |= nir_var_shader_out;
+
+	/* TODO: We shouldn't need to do this, however LLVM isn't currently
+	 * smart enough to handle indirects without causing excess spilling
+	 * causing the gpu to hang.
+	 *
+	 * See the following thread for more details of the problem:
+	 * https://lists.freedesktop.org/archives/mesa-dev/2017-July/162106.html
+	 */
+	indirect_mask |= nir_var_local;
+
+	nir_lower_indirect_derefs(nir, indirect_mask);
+}

src/amd/common/ac_nir_to_llvm.h

@@ -229,6 +229,8 @@ void ac_create_gs_copy_shader(LLVMTargetMachineRef tm,
 			      const struct ac_nir_compiler_options *options,
 			      bool dump_shader);
 
+void ac_lower_indirect_derefs(struct nir_shader *nir, enum chip_class);
+
 void ac_nir_translate(struct ac_llvm_context *ac, struct ac_shader_abi *abi,
 		      struct nir_shader *nir);
 

src/amd/vulkan/radv_pipeline.c

@@ -1527,14 +1527,14 @@ radv_link_shaders(struct radv_pipeline *pipeline, nir_shader **shaders)
 
 		if (progress) {
 			if (nir_lower_global_vars_to_local(ordered_shaders[i])) {
-				radv_lower_indirect_derefs(ordered_shaders[i],
+				ac_lower_indirect_derefs(ordered_shaders[i],
-				                           pipeline->device->physical_device);
+				                         pipeline->device->physical_device->rad_info.chip_class);
 			}
 			radv_optimize_nir(ordered_shaders[i]);
 
 			if (nir_lower_global_vars_to_local(ordered_shaders[i - 1])) {
-				radv_lower_indirect_derefs(ordered_shaders[i - 1],
+				ac_lower_indirect_derefs(ordered_shaders[i - 1],
-				                           pipeline->device->physical_device);
+				                         pipeline->device->physical_device->rad_info.chip_class);
 			}
 			radv_optimize_nir(ordered_shaders[i - 1]);
 		}

src/amd/vulkan/radv_shader.c

@@ -115,45 +115,6 @@ void radv_DestroyShaderModule(
 	vk_free2(&device->alloc, pAllocator, module);
 }
 
-bool
-radv_lower_indirect_derefs(struct nir_shader *nir,
-                           struct radv_physical_device *device)
-{
-	/* While it would be nice not to have this flag, we are constrained
-	 * by the reality that LLVM 5.0 doesn't have working VGPR indexing
-	 * on GFX9.
-	 */
-	bool llvm_has_working_vgpr_indexing =
-		device->rad_info.chip_class <= VI;
-
-	/* TODO: Indirect indexing of GS inputs is unimplemented.
-	 *
-	 * TCS and TES load inputs directly from LDS or offchip memory, so
-	 * indirect indexing is trivial.
-	 */
-	nir_variable_mode indirect_mask = 0;
-	if (nir->info.stage == MESA_SHADER_GEOMETRY ||
-	    (nir->info.stage != MESA_SHADER_TESS_CTRL &&
-	     nir->info.stage != MESA_SHADER_TESS_EVAL &&
-	     !llvm_has_working_vgpr_indexing)) {
-		indirect_mask |= nir_var_shader_in;
-	}
-	if (!llvm_has_working_vgpr_indexing &&
-	    nir->info.stage != MESA_SHADER_TESS_CTRL)
-		indirect_mask |= nir_var_shader_out;
-
-	/* TODO: We shouldn't need to do this, however LLVM isn't currently
-	 * smart enough to handle indirects without causing excess spilling
-	 * causing the gpu to hang.
-	 *
-	 * See the following thread for more details of the problem:
-	 * https://lists.freedesktop.org/archives/mesa-dev/2017-July/162106.html
-	 */
-	indirect_mask |= nir_var_local;
-
-	return nir_lower_indirect_derefs(nir, indirect_mask);
-}
-
 void
 radv_optimize_nir(struct nir_shader *shader)
 {
@@ -304,7 +265,7 @@ radv_shader_compile_to_nir(struct radv_device *device,
 	nir_lower_var_copies(nir);
 	nir_lower_global_vars_to_local(nir);
 	nir_remove_dead_variables(nir, nir_var_local);
-	radv_lower_indirect_derefs(nir, device->physical_device);
+	ac_lower_indirect_derefs(nir, device->physical_device->rad_info.chip_class);
 	radv_optimize_nir(nir);
 
 	return nir;

src/amd/vulkan/radv_shader.h

@@ -104,10 +104,6 @@ void
 radv_shader_variant_destroy(struct radv_device *device,
 			    struct radv_shader_variant *variant);
 
-bool
-radv_lower_indirect_derefs(struct nir_shader *nir,
-                           struct radv_physical_device *device);
-
 const char *
 radv_get_shader_name(struct radv_shader_variant *var, gl_shader_stage stage);