[Mesa-dev] [PATCH] nir: remove dead glsl variables before lowering io.

Dave Airlie airlied at gmail.com
Fri May 20 20:49:49 UTC 2016

From: Dave Airlie <airlied at redhat.com>

For cull distance GLSL will let unsized unused arrays get
into the backend, we should nuke those straight away, to
save caring about them later.

This fixes:
as a side effect (even without culling changes).

Signed-off-by: Dave Airlie <airlied at redhat.com>

Signed-off-by: Dave Airlie <airlied at redhat.com>
 src/mesa/drivers/dri/i965/brw_nir.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/src/mesa/drivers/dri/i965/brw_nir.c b/src/mesa/drivers/dri/i965/brw_nir.c
index 9afd036..6ceac7e 100644
--- a/src/mesa/drivers/dri/i965/brw_nir.c
+++ b/src/mesa/drivers/dri/i965/brw_nir.c
@@ -560,6 +560,8 @@ brw_create_nir(struct brw_context *brw,
    /* First, lower the GLSL IR or Mesa IR to NIR */
    if (shader_prog) {
       nir = glsl_to_nir(shader_prog, stage, options);
+      nir_remove_dead_variables(nir, nir_var_shader_in);
+      nir_remove_dead_variables(nir, nir_var_shader_out);
             true, false);

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