From 9f9f96d2f956e8527b59431b41e6528aabb49953 Mon Sep 17 00:00:00 2001
From: Alyssa Rosenzweig <alyssa@rosenzweig.io>
Date: Tue, 23 Jul 2024 12:34:46 -0400
Subject: [PATCH] nir/gather_info: handle derivative intrinsics

Signed-off-by: Alyssa Rosenzweig <alyssa@rosenzweig.io>
Reviewed-by: Jesse Natalie <jenatali@microsoft.com>
Reviewed-by: Georg Lehmann <dadschoorse@gmail.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/30565>
---
 src/compiler/nir/nir_gather_info.c | 12 ++++++++++++
 1 file changed, 12 insertions(+)

diff --git a/src/compiler/nir/nir_gather_info.c b/src/compiler/nir/nir_gather_info.c
index 4f07282f681..a75d7f2930f 100644
--- a/src/compiler/nir/nir_gather_info.c
+++ b/src/compiler/nir/nir_gather_info.c
@@ -759,6 +759,18 @@ gather_intrinsic_info(nir_intrinsic_instr *instr, nir_shader *shader,
       }
       break;
 
+   case nir_intrinsic_ddx:
+   case nir_intrinsic_ddx_fine:
+   case nir_intrinsic_ddx_coarse:
+   case nir_intrinsic_ddy:
+   case nir_intrinsic_ddy_fine:
+   case nir_intrinsic_ddy_coarse:
+      shader->info.uses_fddx_fddy = true;
+
+      if (shader->info.stage == MESA_SHADER_FRAGMENT)
+         shader->info.fs.needs_quad_helper_invocations = true;
+      break;
+
    case nir_intrinsic_quad_vote_any:
    case nir_intrinsic_quad_vote_all:
    case nir_intrinsic_quad_broadcast: