From d0883027d60c0d6d289e23900972cfa067fc9c54 Mon Sep 17 00:00:00 2001
From: Lioncash <mathew1800@gmail.com>
Date: Mon, 28 Nov 2022 16:05:59 -0500
Subject: [PATCH] syncpoint_manager: Reduce number of bounds checks

The only time we need to check bounds is on the first access.
---
 .../service/nvdrv/core/syncpoint_manager.cpp  | 42 ++++++++++++-------
 1 file changed, 28 insertions(+), 14 deletions(-)

diff --git a/src/core/hle/service/nvdrv/core/syncpoint_manager.cpp b/src/core/hle/service/nvdrv/core/syncpoint_manager.cpp
index eda2041a0d..8d14116d5e 100644
--- a/src/core/hle/service/nvdrv/core/syncpoint_manager.cpp
+++ b/src/core/hle/service/nvdrv/core/syncpoint_manager.cpp
@@ -28,13 +28,15 @@ SyncpointManager::SyncpointManager(Tegra::Host1x::Host1x& host1x_) : host1x{host
 SyncpointManager::~SyncpointManager() = default;
 
 u32 SyncpointManager::ReserveSyncpoint(u32 id, bool client_managed) {
-    if (syncpoints.at(id).reserved) {
+    auto& syncpoint = syncpoints.at(id);
+
+    if (syncpoint.reserved) {
         ASSERT_MSG(false, "Requested syncpoint is in use");
         return 0;
     }
 
-    syncpoints.at(id).reserved = true;
-    syncpoints.at(id).interface_managed = client_managed;
+    syncpoint.reserved = true;
+    syncpoint.interface_managed = client_managed;
 
     return id;
 }
@@ -56,8 +58,9 @@ u32 SyncpointManager::AllocateSyncpoint(bool client_managed) {
 
 void SyncpointManager::FreeSyncpoint(u32 id) {
     std::lock_guard lock(reservation_lock);
-    ASSERT(syncpoints.at(id).reserved);
-    syncpoints.at(id).reserved = false;
+    auto& syncpoint = syncpoints.at(id);
+    ASSERT(syncpoint.reserved);
+    syncpoint.reserved = false;
 }
 
 bool SyncpointManager::IsSyncpointAllocated(u32 id) {
@@ -82,40 +85,51 @@ bool SyncpointManager::HasSyncpointExpired(u32 id, u32 threshold) const {
 }
 
 u32 SyncpointManager::IncrementSyncpointMaxExt(u32 id, u32 amount) {
-    if (!syncpoints.at(id).reserved) {
+    auto& syncpoint = syncpoints.at(id);
+
+    if (!syncpoint.reserved) {
         ASSERT(false);
         return 0;
     }
 
-    return syncpoints.at(id).counter_max += amount;
+    return syncpoint.counter_max += amount;
 }
 
 u32 SyncpointManager::ReadSyncpointMinValue(u32 id) {
-    if (!syncpoints.at(id).reserved) {
+    auto& syncpoint = syncpoints.at(id);
+
+    if (!syncpoint.reserved) {
         ASSERT(false);
         return 0;
     }
 
-    return syncpoints.at(id).counter_min;
+    return syncpoint.counter_min;
 }
 
 u32 SyncpointManager::UpdateMin(u32 id) {
-    if (!syncpoints.at(id).reserved) {
+    auto& syncpoint = syncpoints.at(id);
+
+    if (!syncpoint.reserved) {
         ASSERT(false);
         return 0;
     }
 
-    syncpoints.at(id).counter_min = host1x.GetSyncpointManager().GetHostSyncpointValue(id);
-    return syncpoints.at(id).counter_min;
+    syncpoint.counter_min = host1x.GetSyncpointManager().GetHostSyncpointValue(id);
+    return syncpoint.counter_min;
 }
 
 NvFence SyncpointManager::GetSyncpointFence(u32 id) {
-    if (!syncpoints.at(id).reserved) {
+    auto& syncpoint = syncpoints.at(id);
+
+    if (!syncpoint.reserved) {
         ASSERT(false);
         return NvFence{};
     }
 
-    return {.id = static_cast<s32>(id), .value = syncpoints.at(id).counter_max};
+    return {
+        .id = static_cast<s32>(id),
+        .value = syncpoint.counter_max,
+    };
 }
 
 } // namespace Service::Nvidia::NvCore