From 87ed2f23a326234f589ff512684533792f41f36f Mon Sep 17 00:00:00 2001
From: Katharine Hyatt <khyatt@flatironinstitute.org>
Date: Mon, 24 Nov 2025 13:14:05 -0500
Subject: [PATCH] Return early (don't kernel launch) for copytrito and
 zero-sized arrays

---
 src/host/linalg.jl | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/src/host/linalg.jl b/src/host/linalg.jl
index 0cc40bf1..24106557 100644
--- a/src/host/linalg.jl
+++ b/src/host/linalg.jl
@@ -164,6 +164,7 @@ if isdefined(LinearAlgebra, :copytrito!)
             else
                 (m1 < m || n1 < n) && throw(DimensionMismatch("B of size ($m1,$n1) should have at least size ($m,$n)"))
             end
+            length(A) == 0 && return B
             @kernel function U_kernel!(_A, _B)
                 I = @index(Global, Cartesian)
                 i, j = Tuple(I)
@@ -178,6 +179,7 @@ if isdefined(LinearAlgebra, :copytrito!)
             else
                 (m1 < m || n1 < n) && throw(DimensionMismatch("B of size ($m1,$n1) should have at least size ($m,$n)"))
             end
+            length(A) == 0 && return B
             @kernel function L_kernel!(_A, _B)
                 I = @index(Global, Cartesian)
                 i, j = Tuple(I)