Mesa (master): broadcom/compiler: Add a constant folding pass after nir_lower_io

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Module: Mesa
Branch: master
Commit: c3258f927c462cc2e24106e7841138452f7fec10
URL:    http://cgit.freedesktop.org/mesa/mesa/commit/?id=c3258f927c462cc2e24106e7841138452f7fec10

Author: Arcady Goldmints-Orlov <agoldmints at igalia.com>
Date:   Sat Jul 25 10:39:31 2020 -0500

broadcom/compiler: Add a constant folding pass after nir_lower_io

The nir_lower_io pass produces a bunch of constant arithmetic, and
assumes that constant folding will simplify it away.

Reviewed-by: Iago Toral Quiroga <itoral at igalia.com>
Reviewed-by: Eric Anholt <eric at anholt.net>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/6356>

---

 src/broadcom/compiler/vir.c | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/src/broadcom/compiler/vir.c b/src/broadcom/compiler/vir.c
index d81931ec27b..d06f789161f 100644
--- a/src/broadcom/compiler/vir.c
+++ b/src/broadcom/compiler/vir.c
@@ -821,8 +821,11 @@ v3d_nir_lower_vs_early(struct v3d_compile *c)
         NIR_PASS_V(c->s, nir_lower_io, nir_var_shader_in | nir_var_shader_out,
                    type_size_vec4,
                    (nir_lower_io_options)0);
-        /* clean up nir_lower_io's deref_var remains */
+        /* clean up nir_lower_io's deref_var remains and do a constant folding pass
+         * on the code it generated.
+         */
         NIR_PASS_V(c->s, nir_opt_dce);
+        NIR_PASS_V(c->s, nir_opt_constant_folding);
 }
 
 static void