Fix #1883.

diku-dk · Mar 25, 2023 · d97023a · d97023a
1 parent e43b34d
commit d97023a
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diff --git a/CHANGELOG.md b/CHANGELOG.md
@@ -24,6 +24,8 @@ and this project adheres to [Semantic Versioning](http://semver.org/spec/v2.0.0.
 
 * AD for certain combinations of `map` and indexing (#1878).
 
+* Barrier divergence in generated code in some exotic cases (#1883).
+
 ## [0.23.1]
 
 ### Added

diff --git a/src/Futhark/CodeGen/ImpGen/GPU/Group.hs b/src/Futhark/CodeGen/ImpGen/GPU/Group.hs
@@ -256,7 +256,7 @@ groupCoverSegSpace virt space m = do
           groupLoop iterations $ \i -> do
             dIndexSpace (zip ltids dims') $ sExt64 i
             m
-        Just num_chunks -> do
+        Just num_chunks -> localOps threadOperations $ do
           let ltid = kernelLocalThreadId constants
           sFor "chunk_i" num_chunks $ \chunk_i -> do
             i <- dPrimVE "i" $ chunk_i * sExt32 group_size + ltid