From a5d8bd2e290d5a4e17dc52b6ea1a6f9bdf769433 Mon Sep 17 00:00:00 2001
From: Xavier Hallade <me@ph0b.com>
Date: Mon, 24 Feb 2025 13:39:12 +0100
Subject: [PATCH] Cycles: Drop inline hint on light_tree_pdf

Dropping the inlining hint for `light_tree_pdf` and reverting to the
default inlining thresholds for DPC++ compiler gives a ~4% speedup on
classroom and other scenes on Arc B580.

Pull Request: https://projects.blender.org/blender/blender/pulls/135042
---
 intern/cycles/kernel/CMakeLists.txt |  2 --
 intern/cycles/kernel/light/tree.h   | 16 ++++++++--------
 2 files changed, 8 insertions(+), 10 deletions(-)

diff --git a/intern/cycles/kernel/CMakeLists.txt b/intern/cycles/kernel/CMakeLists.txt
index 59c98a91785..d643572d839 100644
--- a/intern/cycles/kernel/CMakeLists.txt
+++ b/intern/cycles/kernel/CMakeLists.txt
@@ -942,8 +942,6 @@ if(WITH_CYCLES_DEVICE_ONEAPI)
     -fsycl
     -fsycl-unnamed-lambda
     -fdelayed-template-parsing
-    -mllvm -inlinedefault-threshold=250
-    -mllvm -inlinehint-threshold=350
     -fsycl-device-code-split=per_kernel
     -fsycl-max-parallel-link-jobs=${SYCL_OFFLINE_COMPILER_PARALLEL_JOBS}
     --offload-compress
diff --git a/intern/cycles/kernel/light/tree.h b/intern/cycles/kernel/light/tree.h
index 98b76033edf..f151059e192 100644
--- a/intern/cycles/kernel/light/tree.h
+++ b/intern/cycles/kernel/light/tree.h
@@ -913,14 +913,14 @@ ccl_device float light_tree_pdf(KernelGlobals kg,
 
 /* If the function is called in volume, retrieve the previous point in volume segment, and compute
  * pdf from there. Otherwise compute from the current shading point. */
-ccl_device_inline float light_tree_pdf(KernelGlobals kg,
-                                       float3 P,
-                                       const float3 N,
-                                       const float dt,
-                                       const int path_flag,
-                                       const int emitter_object,
-                                       const uint emitter_id,
-                                       const int object_receiver)
+ccl_device float light_tree_pdf(KernelGlobals kg,
+                                float3 P,
+                                const float3 N,
+                                const float dt,
+                                const int path_flag,
+                                const int emitter_object,
+                                const uint emitter_id,
+                                const int object_receiver)
 {
   if (path_flag & PATH_RAY_VOLUME_SCATTER) {
     const float3 D_times_t = N;