---
src/mesa/drivers/dri/i965/brw_fs.cpp | 7 +++++++
1 file changed, 7 insertions(+)
diff --git a/src/mesa/drivers/dri/i965/brw_fs.cpp
b/src/mesa/drivers/dri/i965/brw_fs.cpp
index ca6368e..8eff27e 100644
--- a/src/mesa/drivers/dri/i965/brw_fs.cpp
+++ b/src/mesa/drivers/dri/i965/brw_fs.cpp
@@ -5029,6 +5029,13 @@ emit_unzip(const fs_builder &lbld, bblock_t *block,
fs_inst *inst,
*/
return inst->src[i];
+ } else if (inst->components_read(i) == 1 &&
+ lbld.dispatch_width() <= inst->exec_size) {
+ /* The source is a single component, we can just point the lowered
+ * instruction at the right channel group from the original region.
+ */
+ return src;
+
} else {
/* Builder of the right width to perform the copy avoiding uninitialized
* data if the lowered execution size is greater than the original
--
2.7.3
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