From d291f368a0051a706df9ce985445d46030bd391c Mon Sep 17 00:00:00 2001
From: Rhys Perry <pendingchaos02@gmail.com>
Date: Fri, 31 Mar 2023 19:44:34 +0100
Subject: [PATCH] ac/llvm: support implicit LOD for nir_texop_tg4

Signed-off-by: Rhys Perry <pendingchaos02@gmail.com>
Reviewed-by: Georg Lehmann <dadschoorse@gmail.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/22315>
---
 src/amd/llvm/ac_nir_to_llvm.c | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/src/amd/llvm/ac_nir_to_llvm.c b/src/amd/llvm/ac_nir_to_llvm.c
index 66999356a09..9739e3a0c2d 100644
--- a/src/amd/llvm/ac_nir_to_llvm.c
+++ b/src/amd/llvm/ac_nir_to_llvm.c
@@ -1601,8 +1601,10 @@ static LLVMValueRef build_tex_intrinsic(struct ac_nir_context *ctx, const nir_te
       break;
    case nir_texop_tg4:
       args->opcode = ac_image_gather4;
-      if (!args->lod && !args->bias)
+      if (!args->lod && !instr->is_gather_implicit_lod)
          args->level_zero = true;
+      /* GFX11 supports implicit LOD, but the extension is unsupported. */
+      assert(args->level_zero || ctx->ac.gfx_level < GFX11);
       break;
    case nir_texop_lod:
       args->opcode = ac_image_get_lod;