From e0c267c7521acfa7923bf13b2ac769eac6e13230 Mon Sep 17 00:00:00 2001 From: Alyssa Rosenzweig Date: Sun, 21 Oct 2018 11:29:37 -0700 Subject: [PATCH] mesa/st: Only call nir_lower_io_to_scalar_early on scalar ISAs On scalar ISAs, nir_lower_io_to_scalar_early enables significant optimizations. However, on vector ISAs, it is counterproductive and impedes optimal codegen. This patch only calls nir_lower_io_to_scalar_early for scalar ISAs. It appears that at present there are no upstreamed drivers using Gallium, NIR, and a vector ISA, so for existing code, this should be a no-op. However, this patch is necessary for the upcoming Panfrost (Midgard) and Lima (Utgard) compilers, which are vector. With this patch, Panfrost is able to consume NIR directly, rather than TGSI with the TGSI->NIR conversion. For how this affects Lima, see https://www.mail-archive.com/mesa-dev@lists.freedesktop.org/msg189216.html Signed-off-by: Alyssa Rosenzweig Reviewed-by: Timothy Arceri Reviewed-by: Christian Gmeiner --- src/mesa/state_tracker/st_glsl_to_nir.cpp | 5 ++++- 1 file changed, 4 insertions(+), 1 deletion(-) diff --git a/src/mesa/state_tracker/st_glsl_to_nir.cpp b/src/mesa/state_tracker/st_glsl_to_nir.cpp index 24776f7..9112844 100644 --- a/src/mesa/state_tracker/st_glsl_to_nir.cpp +++ b/src/mesa/state_tracker/st_glsl_to_nir.cpp @@ -665,7 +665,10 @@ st_link_nir(struct gl_context *ctx, mask = (nir_variable_mode)(mask | nir_var_shader_out); nir_shader *nir = shader->Program->nir; - NIR_PASS_V(nir, nir_lower_io_to_scalar_early, mask); + + if (is_scalar[i]) + NIR_PASS_V(nir, nir_lower_io_to_scalar_early, mask); + st_nir_opts(nir, is_scalar[i]); } -- 2.7.4