radeonsi: don't write undefined output channels to LDS in LS

Reviewed-by: Nicolai Hähnle <nicolai.haehnle@amd.com>

diff --git a/src/gallium/drivers/radeonsi/si_shader.c b/src/gallium/drivers/radeonsi/si_shader.c
index bca0ca9..16036e3 100644 (file)
--- a/src/gallium/drivers/radeonsi/si_shader.c
+++ b/src/gallium/drivers/radeonsi/si_shader.c
@@ -3176,6 +3176,9 @@ static void si_llvm_emit_ls_epilogue(struct lp_build_tgsi_context *bld_base)
                                        LLVMConstInt(ctx->i32, param * 4, 0), "");
 
                for (chan = 0; chan < 4; chan++) {
+                       if (!(info->output_usagemask[i] & (1 << chan)))
+                               continue;
+
                        lds_store(bld_base, chan, dw_addr,
                                  LLVMBuildLoad(ctx->ac.builder, out_ptr[chan], ""));
                }