radv: do not emit unnecessary GS output stores

Signed-off-by: Samuel Pitoiset <samuel.pitoiset@gmail.com>
Reviewed-by: Bas Nieuwenhuizen <bas@basnieuwenhuizen.nl>

diff --git a/src/amd/vulkan/radv_nir_to_llvm.c b/src/amd/vulkan/radv_nir_to_llvm.c
index b4af0f2..05ae709 100644 (file)
--- a/src/amd/vulkan/radv_nir_to_llvm.c
+++ b/src/amd/vulkan/radv_nir_to_llvm.c
@@ -1684,6 +1684,8 @@ visit_emit_vertex(struct ac_shader_abi *abi, unsigned stream, LLVMValueRef *addr
        /* loop num outputs */
        idx = 0;
        for (unsigned i = 0; i < AC_LLVM_MAX_OUTPUTS; ++i) {
+               unsigned output_usage_mask =
+                       ctx->shader_info->info.gs.output_usage_mask[i];
                LLVMValueRef *out_ptr = &addrs[i * 4];
                int length = 4;
                int slot = idx;
@@ -1697,8 +1699,13 @@ visit_emit_vertex(struct ac_shader_abi *abi, unsigned stream, LLVMValueRef *addr
                        length = ctx->num_output_clips + ctx->num_output_culls;
                        if (length > 4)
                                slot_inc = 2;
+                       output_usage_mask = (1 << length) - 1;
                }
+
                for (unsigned j = 0; j < length; j++) {
+                       if (!(output_usage_mask & (1 << j)))
+                               continue;
+
                        LLVMValueRef out_val = LLVMBuildLoad(ctx->ac.builder,
                                                             out_ptr[j], "");
                        LLVMValueRef voffset = LLVMConstInt(ctx->ac.i32, (slot * 4 + j) * ctx->gs_max_out_vertices, false);