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-rw-r--r--src/mesa/drivers/dri/i965/brw_fs_vector_splitting.cpp3
1 files changed, 3 insertions, 0 deletions
diff --git a/src/mesa/drivers/dri/i965/brw_fs_vector_splitting.cpp b/src/mesa/drivers/dri/i965/brw_fs_vector_splitting.cpp
index d4da86b3b06..00d5c202485 100644
--- a/src/mesa/drivers/dri/i965/brw_fs_vector_splitting.cpp
+++ b/src/mesa/drivers/dri/i965/brw_fs_vector_splitting.cpp
@@ -281,6 +281,9 @@ ir_vector_splitting_visitor::visit_leave(ir_assignment *ir)
if (rhs) {
new_rhs = new(mem_ctx) ir_dereference_variable(rhs->components[i]);
+ /* If we're writing into a writemask, smear it out to that channel. */
+ if (!lhs)
+ new_rhs = new(mem_ctx) ir_swizzle(new_rhs, i, i, i, i, i + 1);
} else {
new_rhs = new(mem_ctx) ir_swizzle(ir->rhs->clone(mem_ctx, NULL),
i, i, i, i, 1);