From: Ian Romanick <ian.d.roman...@intel.com>
If the non-constant index was in the LHS of an assignment, any
existing condititon on that assignment would be lost.
Fixes i965 piglit:
fs-temp-array-mat[234]-col-row-wr
fs-temp-array-mat[234]-index-col-row-wr
fs-temp-array-mat[234]-index-col-wr
fs-temp-array-mat[234]-index-row-wr
vs-varying-array-mat[234]-index-col-wr
---
src/glsl/lower_variable_index_to_cond_assign.cpp | 21 ++++++++++++++++++---
1 files changed, 18 insertions(+), 3 deletions(-)
diff --git a/src/glsl/lower_variable_index_to_cond_assign.cpp
b/src/glsl/lower_variable_index_to_cond_assign.cpp
index 03621b5..8cb8d98 100644
--- a/src/glsl/lower_variable_index_to_cond_assign.cpp
+++ b/src/glsl/lower_variable_index_to_cond_assign.cpp
@@ -423,9 +423,24 @@ public:
switch_generator sg(ag, index, 4, 4);
- exec_list list;
- sg.generate(0, length, &list);
- base_ir->insert_before(&list);
+ /* If the original assignment has a condition, respect that original
+ * condition! This is acomplished by wrapping the new conditional
+ * assignments in an if-statement that uses the original condition.
+ */
+ if ((orig_assign != NULL) && (orig_assign->condition != NULL)) {
+ /* No need to clone the condition because the IR that it hangs on is
+ * going to be removed from the instruction sequence.
+ */
+ ir_if *if_stmt = new(mem_ctx) ir_if(orig_assign->condition);
+
+ sg.generate(0, length, &if_stmt->then_instructions);
+ base_ir->insert_before(if_stmt);
+ } else {
+ exec_list list;
+
+ sg.generate(0, length, &list);
+ base_ir->insert_before(&list);
+ }
return var;
}
--
1.7.4.4
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