Add a piglit test which reproduces an opt_vectorizer bug.

This reproduces an ir_validator failure in Serious Sam 3 shaders caused
by the vectorizer pass, which I uncovered while doing unrelated work.

Signed-off-by: Kenneth Graunke <kenneth@whitecape.org>
Reviewed-by: Matt Turner <mattst88@gmail.com>

1 files changed, 17 insertions, 0 deletions

diff --git a/tests/glslparsertest/glsl2/repeated-channel-assignment.vert b/tests/glslparsertest/glsl2/repeated-channel-assignment.vert
new file mode 100644
index 000000000..e7ba9613f
--- /dev/null
+++ b/tests/glslparsertest/glsl2/repeated-channel-assignment.vert
@@ -0,0 +1,17 @@
+// [config]
+// expect_result: pass
+// glsl_version: 1.10
+// [end config]
+
+uniform vec4 u;
+
+void main()
+{
+    vec2 v = vec2(0);
+
+    v -= u.xy;
+    v.x += u.x;
+    v.x += u.x;
+
+    gl_Position = v.xxyy;
+}