I found this in a shader that was doing an alpha test when alpha is fixed
at 1.0.
instructions in affected programs: 16 -> 15 (-6.25%)
total uniforms in shared programs: 28703 -> 28703 (0.00%)
---
src/compiler/nir/nir_opt_constant_folding.c | 8 ++++++++
1 file changed, 8 insertions(+)
diff --git a/src/compiler/nir/nir_opt_constant_folding.c
b/src/compiler/nir/nir_opt_constant_folding.c
index 04876a4..8a353c2 100644
--- a/src/compiler/nir/nir_opt_constant_folding.c
+++ b/src/compiler/nir/nir_opt_constant_folding.c
@@ -130,6 +130,14 @@ constant_fold_intrinsic_instr(nir_intrinsic_instr *instr)
progress |= constant_fold_deref(&instr->instr, instr->variables[i]);
}
+ if (instr->intrinsic == nir_intrinsic_discard_if) {
+ nir_const_value *src_val = nir_src_as_const_value(instr->src[0]);
+ if (src_val && src_val->u[0] == 0) {
+ nir_instr_remove(&instr->instr);
+ progress = true;
+ }
+ }
+
return progress;
}
--
2.7.0
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