[Piglit] [PATCH] glsl-1.10: test unrolling another loop with variable iteration limits

[Timothy Arceri]

This tests unrolling of a loop with a single exit point but where the
exact trip count is unknown, only the max iteration count is known.

Here we make sure that the and condition won't be simplified into
a min() by another opt pass.
---
 ...riable-iteration-limit-unroll3.shader_test | 75 +++++++++++++++++++
 1 file changed, 75 insertions(+)
 create mode 100644 tests/spec/glsl-1.10/execution/vs-loop-variable-iteration-limit-unroll3.shader_test

diff --git a/tests/spec/glsl-1.10/execution/vs-loop-variable-iteration-limit-unroll3.shader_test b/tests/spec/glsl-1.10/execution/vs-loop-variable-iteration-limit-unroll3.shader_test
new file mode 100644
index 000000000..b21f43ad0
--- /dev/null
+++ b/tests/spec/glsl-1.10/execution/vs-loop-variable-iteration-limit-unroll3.shader_test
@@ -0,0 +1,75 @@
+# This tests unrolling of a loop with a single exit point but where the
+# exact trip count is unknown, only the max iteration count (4) is known.
+#
+# Here we test all possible outcomes for the loop and also add some
+# unreachable code to make sure it is not accessible after unrolling.
+[require]
+GLSL >= 1.10
+
+[vertex shader]
+uniform int loop_count;
+
+void main()
+{
+  gl_Position = gl_Vertex;
+
+  vec4 colour = vec4(1.0, 1.0, 1.0, 1.0);
+
+  int i = 0;
+  int x = 0;
+  while (x < loop_count && i < 4) {
+    if (x == 0 && i == 0)
+      colour = vec4(0.0, 0.25, 0.0, 1.0);
+
+    if (x == 2 && i == 1)
+      colour = vec4(0.0, 0.5, 0.0, 1.0);
+
+    if (x == 4 && i == 2)
+      colour = vec4(0.0, 0.75, 0.0, 1.0);
+
+    if (x == 6 && i == 3)
+      colour = vec4(0.0, 1.0, 0.0, 1.0);
+
+    /* This should be unreachable */
+    if (x >= 8 || i >= 4)
+      colour = vec4(1.0, 0.0, 0.0, 1.0);
+
+    i++;
+    x+=2;
+  }
+
+  gl_FrontColor = colour;
+}
+
+[fragment shader]
+void main()
+{
+  gl_FragColor = gl_Color;
+}
+
+[test]
+clear color 0.5 0.5 0.5 0.5
+
+uniform int loop_count 0
+draw rect -1 -1 2 2
+probe all rgba 1.0 1.0 1.0 1.0
+
+uniform int loop_count 2
+draw rect -1 -1 2 2
+probe all rgba 0.0 0.25 0.0 1.0
+
+uniform int loop_count 4
+draw rect -1 -1 2 2
+probe all rgba 0.0 0.5 0.0 1.0
+
+uniform int loop_count 6
+draw rect -1 -1 2 2
+probe all rgba 0.0 0.75 0.0 1.0
+
+uniform int loop_count 8
+draw rect -1 -1 2 2
+probe all rgba 0.0 1.0 0.0 1.0
+
+uniform int loop_count 10
+draw rect -1 -1 2 2
+probe all rgba 0.0 1.0 0.0 1.0
-- 
2.20.1