From 14662b51ce218c6b60c0b2f3e69e2bf3eb4dc758 Mon Sep 17 00:00:00 2001
From: Jason Volk <jason@zemos.net>
Date: Fri, 26 Feb 2021 14:18:14 -0800
Subject: [PATCH] ircd::rand: Add random distribution vector generation.

---
 include/ircd/rand.h | 22 ++++++++++++++++++++++
 1 file changed, 22 insertions(+)

diff --git a/include/ircd/rand.h b/include/ircd/rand.h
index 8259a32f9..f2eb89c5a 100644
--- a/include/ircd/rand.h
+++ b/include/ircd/rand.h
@@ -41,6 +41,11 @@ namespace ircd::rand
 	template<> u256x1 vector() noexcept;
 	template<> u512x1 vector() noexcept;
 
+	// Random vector over distribution
+	template<class T,
+	         class distribution>
+	T vector(distribution &);
+
 	// Random fill of buffer
 	const_buffer fill(const mutable_buffer &out) noexcept;
 
@@ -98,6 +103,23 @@ noexcept
 	return dict[pos];
 }
 
+template<class T,
+         class distribution>
+inline T
+ircd::rand::vector(distribution &dist)
+{
+	constexpr auto lanes
+	{
+		simd::lanes<T>()
+	};
+
+	T ret;
+	for(unsigned i(0); i < lanes; ++i)
+		ret[i] = dist(mt);
+
+	return ret;
+}
+
 inline
 ircd::rand::xoshiro256p::xoshiro256p()
 noexcept