Mesa (master): Revert "nir: drop unused alpha_ref_float"

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Module: Mesa
Branch: master
Commit: beb6639a9d064b7c4dce389f9ea56fd1373edf33
URL:    http://cgit.freedesktop.org/mesa/mesa/commit/?id=beb6639a9d064b7c4dce389f9ea56fd1373edf33

Author: Erik Faye-Lund <erik.faye-lund at collabora.com>
Date:   Mon Oct 21 10:48:07 2019 +0200

Revert "nir: drop unused alpha_ref_float"

This reverts commit e8095f2af0736b5937674ca319f29cc9dabb17d4.

Reviewed-by: Eric Anholt <eric at anholt.net>
Reviewed-by: Jose Maria Casanova <jmcasanova at igalia.com>

---

 src/compiler/nir/nir_divergence_analysis.c | 1 +
 src/compiler/nir/nir_intrinsics.py         | 1 +
 2 files changed, 2 insertions(+)

diff --git a/src/compiler/nir/nir_divergence_analysis.c b/src/compiler/nir/nir_divergence_analysis.c
index f03dfec36f9..301d7a4820b 100644
--- a/src/compiler/nir/nir_divergence_analysis.c
+++ b/src/compiler/nir/nir_divergence_analysis.c
@@ -98,6 +98,7 @@ visit_intrinsic(bool *divergent, nir_intrinsic_instr *instr,
    case nir_intrinsic_load_draw_id:
    case nir_intrinsic_load_is_indexed_draw:
    case nir_intrinsic_load_viewport_scale:
+   case nir_intrinsic_load_alpha_ref_float:
    case nir_intrinsic_load_user_clip_plane:
    case nir_intrinsic_load_viewport_x_scale:
    case nir_intrinsic_load_viewport_y_scale:
diff --git a/src/compiler/nir/nir_intrinsics.py b/src/compiler/nir/nir_intrinsics.py
index 637576c092a..a648995f7fd 100644
--- a/src/compiler/nir/nir_intrinsics.py
+++ b/src/compiler/nir/nir_intrinsics.py
@@ -572,6 +572,7 @@ system_value("work_group_id", 3)
 system_value("user_clip_plane", 4, indices=[UCP_ID])
 system_value("num_work_groups", 3)
 system_value("helper_invocation", 1, bit_sizes=[1, 32])
+system_value("alpha_ref_float", 1)
 system_value("layer_id", 1)
 system_value("view_index", 1)
 system_value("subgroup_size", 1)