From 2474118a066d3f87b749eeb999c0c45cf620bc61 Mon Sep 17 00:00:00 2001
From: Samuel Pitoiset <samuel.pitoiset@gmail.com>
Date: Tue, 3 Jun 2025 09:31:42 +0200
Subject: [PATCH] spirv: disable mediump for bitfield insert/extract

This prevents a regression with the next change that generalizes
bitfield insert/extract sizes.

Signed-off-by: Samuel Pitoiset <samuel.pitoiset@gmail.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/35209>
---
 src/compiler/spirv/vtn_alu.c | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/src/compiler/spirv/vtn_alu.c b/src/compiler/spirv/vtn_alu.c
index a528b2e1b12..73170e3541b 100644
--- a/src/compiler/spirv/vtn_alu.c
+++ b/src/compiler/spirv/vtn_alu.c
@@ -585,6 +585,10 @@ vtn_alu_op_mediump_16bit(struct vtn_builder *b, SpvOp opcode, struct vtn_value *
    case SpvOpFwidthFine:
    case SpvOpFwidthCoarse:
       return b->options->mediump_16bit_derivatives;
+   case SpvOpBitFieldInsert:
+   case SpvOpBitFieldSExtract:
+   case SpvOpBitFieldUExtract:
+      return false;
    default:
       return true;
    }