From a28d2e87d347b94c41ad9299c7e88978faf7174c Mon Sep 17 00:00:00 2001
From: Emma Anholt <emma@anholt.net>
Date: Mon, 2 May 2022 16:22:37 -0700
Subject: [PATCH] turnip: Make RelaxedPrecision-decorated ALU ops 16-bit.

Improves gfxbench vk-5-normal performance 5.5%.

Fixes: #6346
Reviewed-by: Matt Turner <mattst88@gmail.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/16465>
---
 src/freedreno/vulkan/tu_shader.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/src/freedreno/vulkan/tu_shader.c b/src/freedreno/vulkan/tu_shader.c
index c977b1d8566..2d41900f84e 100644
--- a/src/freedreno/vulkan/tu_shader.c
+++ b/src/freedreno/vulkan/tu_shader.c
@@ -54,6 +54,9 @@ tu_spirv_to_nir(struct tu_device *dev,
       /* Accessed via stg/ldg (not used with Vulkan?) */
       .global_addr_format = nir_address_format_64bit_global,
 
+      /* Use 16-bit math for RelaxedPrecision ALU ops */
+      .mediump_16bit_alu = true,
+
       /* ViewID is a sysval in geometry stages and an input in the FS */
       .view_index_is_input = stage == MESA_SHADER_FRAGMENT,
       .caps = {