From 347cdba1c6a4e10b063cc6c591d81ea07270e5c7 Mon Sep 17 00:00:00 2001
From: Jason Volk <jason@zemos.net>
Date: Thu, 17 Sep 2020 01:43:06 -0700
Subject: [PATCH] ircd::m::room::auth: Parallelize index query.

---
 matrix/room_auth.cc | 17 +++++++++++------
 1 file changed, 11 insertions(+), 6 deletions(-)

diff --git a/matrix/room_auth.cc b/matrix/room_auth.cc
index be699d3ac..35e2e827c 100644
--- a/matrix/room_auth.cc
+++ b/matrix/room_auth.cc
@@ -574,14 +574,19 @@ ircd::m::room::auth::static_idx(const event &event)
 			count,
 		};
 
-	return
+	size_t i(0);
+	m::event::id ids[5];
+	std::array<m::event::idx, 5> idxs {{0}};
+	for(; i < count && i < 5; ++i)
+		ids[i] = refs.auth_event(i);
+
+	assert(i <= idxs.size());
+	const auto found
 	{
-		count > 0? m::index(refs.auth_event(0)): 0UL,
-		count > 1? m::index(refs.auth_event(1)): 0UL,
-		count > 2? m::index(refs.auth_event(2)): 0UL,
-		count > 3? m::index(refs.auth_event(3)): 0UL,
-		count > 4? m::index(refs.auth_event(4)): 0UL,
+		m::index(idxs, vector_view<const m::event::id>(ids, i))
 	};
+
+	return idxs;
 }
 
 std::array<ircd::m::event::idx, 5>