From e1f2b487cea9245ebc6ed48678019b673741c1ea Mon Sep 17 00:00:00 2001
From: Andreas Kloeckner <inform@tiker.net>
Date: Mon, 8 Apr 2013 11:08:13 -0400
Subject: [PATCH] Catch 'empty scan' corner case.
---
pyopencl/scan.py | 4 ++++
1 file changed, 4 insertions(+)
diff --git a/pyopencl/scan.py b/pyopencl/scan.py
index 9692233d..d0781b31 100644
--- a/pyopencl/scan.py
+++ b/pyopencl/scan.py
@@ -1272,6 +1272,10 @@ class GenericScanKernel(_GenericScanKernelBase):
if n is None:
n, = first_array.shape
+ if n == 0:
+ # We're done here.
+ return
+
data_args = []
from pyopencl.tools import VectorArg
for arg_descr, arg_val in zip(self.parsed_args, args):
--
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