ac: add load_patch_vertices_in() to the abi

Fixes the follow test for radeonsi nir:

tests/spec/arb_tessellation_shader/execution/quads.shader_test

Also stops 8 other tests from crashing, they now just fail e.g.

tcs-output-array-float-index-rd-after-barrier.shader_test

Reviewed-by: Marek Olšák <marek.olsak@amd.com>
Reviewed-by: Samuel Pitoiset <samuel.pitoiset@gmail.com>

src/amd/common/ac_nir_to_llvm.c

@@ -4166,6 +4166,13 @@ load_tess_coord(struct ac_shader_abi *abi, LLVMTypeRef type,
 	return LLVMBuildBitCast(ctx->builder, result, type, "");
 }
 
+static LLVMValueRef
+load_patch_vertices_in(struct ac_shader_abi *abi)
+{
+	struct nir_to_llvm_context *ctx = nir_to_llvm_context_from_abi(abi);
+	return LLVMConstInt(ctx->ac.i32, ctx->options->key.tcs.input_vertices, false);
+}
+
 static void visit_intrinsic(struct ac_nir_context *ctx,
                             nir_intrinsic_instr *instr)
 {
@@ -4366,7 +4373,7 @@ static void visit_intrinsic(struct ac_nir_context *ctx,
 		result = ctx->abi->load_tess_level(ctx->abi, VARYING_SLOT_TESS_LEVEL_INNER);
 		break;
 	case nir_intrinsic_load_patch_vertices_in:
-		result = LLVMConstInt(ctx->ac.i32, ctx->nctx->options->key.tcs.input_vertices, false);
+		result = ctx->abi->load_patch_vertices_in(ctx->abi);
 		break;
 	default:
 		fprintf(stderr, "Unknown intrinsic: ");
@@ -6698,11 +6705,13 @@ LLVMModuleRef ac_translate_nir_to_llvm(LLVMTargetMachineRef tm,
 			ctx.tcs_outputs_read = shaders[i]->info.outputs_read;
 			ctx.tcs_patch_outputs_read = shaders[i]->info.patch_outputs_read;
 			ctx.abi.load_tess_inputs = load_tcs_input;
+			ctx.abi.load_patch_vertices_in = load_patch_vertices_in;
 			ctx.abi.store_tcs_outputs = store_tcs_output;
 		} else if (shaders[i]->info.stage == MESA_SHADER_TESS_EVAL) {
 			ctx.tes_primitive_mode = shaders[i]->info.tess.primitive_mode;
 			ctx.abi.load_tess_inputs = load_tes_input;
 			ctx.abi.load_tess_coord = load_tess_coord;
+			ctx.abi.load_patch_vertices_in = load_patch_vertices_in;
 		} else if (shaders[i]->info.stage == MESA_SHADER_VERTEX) {
 			if (shader_info->info.vs.needs_instance_id) {
 				if (ctx.ac.chip_class == GFX9 &&

src/amd/common/ac_shader_abi.h

@@ -103,6 +103,8 @@ struct ac_shader_abi {
 					LLVMTypeRef type,
 					unsigned num_components);
 
+	LLVMValueRef (*load_patch_vertices_in)(struct ac_shader_abi *abi);
+
 	LLVMValueRef (*load_tess_level)(struct ac_shader_abi *abi,
 					unsigned varying_id);
 

src/gallium/drivers/radeonsi/si_shader.c

@@ -1955,6 +1955,17 @@ static LLVMValueRef si_load_tess_level(struct ac_shader_abi *abi,
 
 }
 
+static LLVMValueRef si_load_patch_vertices_in(struct ac_shader_abi *abi)
+{
+	struct si_shader_context *ctx = si_shader_context_from_abi(abi);
+	if (ctx->type == PIPE_SHADER_TESS_CTRL)
+		return unpack_param(ctx, ctx->param_tcs_out_lds_layout, 26, 6);
+	else if (ctx->type == PIPE_SHADER_TESS_EVAL)
+		return get_num_tcs_out_vertices(ctx);
+	else
+		assert(!"invalid shader stage for TGSI_SEMANTIC_VERTICESIN");
+}
+
 void si_load_system_value(struct si_shader_context *ctx,
 			  unsigned index,
 			  const struct tgsi_full_declaration *decl)
@@ -2063,12 +2074,7 @@ void si_load_system_value(struct si_shader_context *ctx,
 		break;
 
 	case TGSI_SEMANTIC_VERTICESIN:
-		if (ctx->type == PIPE_SHADER_TESS_CTRL)
+		value = si_load_patch_vertices_in(&ctx->abi);
-			value = unpack_param(ctx, ctx->param_tcs_out_lds_layout, 26, 6);
-		else if (ctx->type == PIPE_SHADER_TESS_EVAL)
-			value = get_num_tcs_out_vertices(ctx);
-		else
-			assert(!"invalid shader stage for TGSI_SEMANTIC_VERTICESIN");
 		break;
 
 	case TGSI_SEMANTIC_TESSINNER:
@@ -5986,6 +5992,7 @@ static bool si_compile_tgsi_main(struct si_shader_context *ctx,
 		bld_base->emit_store = store_output_tcs;
 		ctx->abi.store_tcs_outputs = si_nir_store_output_tcs;
 		ctx->abi.emit_outputs = si_llvm_emit_tcs_epilogue;
+		ctx->abi.load_patch_vertices_in = si_load_patch_vertices_in;
 		bld_base->emit_epilogue = si_tgsi_emit_epilogue;
 		break;
 	case PIPE_SHADER_TESS_EVAL:
@@ -5993,6 +6000,7 @@ static bool si_compile_tgsi_main(struct si_shader_context *ctx,
 		ctx->abi.load_tess_inputs = si_nir_load_input_tes;
 		ctx->abi.load_tess_coord = si_load_tess_coord;
 		ctx->abi.load_tess_level = si_load_tess_level;
+		ctx->abi.load_patch_vertices_in = si_load_patch_vertices_in;
 		if (shader->key.as_es)
 			ctx->abi.emit_outputs = si_llvm_emit_es_epilogue;
 		else