[Piglit] [PATCH] Test that loop unrolling properly infers loop bounds.

[Paul Berry]

This patch introduces new vs and fs tests to provoke a bug in Mesa
which caused loop bounds to be inferred incorrectly when the loop
condition was expressed in an unusual way (e.g. "4 > i" instead of "i
< 4").
---
 .../execution/fs-loop-bounds-unrolled.shader_test  | 40 +++++++++++++++++++++
 .../execution/vs-loop-bounds-unrolled.shader_test  | 41 ++++++++++++++++++++++
 2 files changed, 81 insertions(+)
 create mode 100644 tests/spec/glsl-1.10/execution/fs-loop-bounds-unrolled.shader_test
 create mode 100644 tests/spec/glsl-1.10/execution/vs-loop-bounds-unrolled.shader_test

diff --git a/tests/spec/glsl-1.10/execution/fs-loop-bounds-unrolled.shader_test b/tests/spec/glsl-1.10/execution/fs-loop-bounds-unrolled.shader_test
new file mode 100644
index 0000000..40fa6b7
--- /dev/null
+++ b/tests/spec/glsl-1.10/execution/fs-loop-bounds-unrolled.shader_test
@@ -0,0 +1,40 @@
+# This test verifies that loop unrolling properly interprets a variety
+# of ways of specifying loop bounds.
+
+[vertex shader]
+void main()
+{
+  gl_Position = gl_Vertex;
+}
+
+[fragment shader]
+void main()
+{
+  int sum;
+  int i;
+  bool failed = false;
+
+  sum = 0; for (i = 10; i < 14; i++) sum += i; if (sum != 46) failed = true;
+  sum = 0; for (i = 10; i <= 13; i++) sum += i; if (sum != 46) failed = true;
+  sum = 0; for (i = 10; 14 > i; i++) sum += i; if (sum != 46) failed = true;
+  sum = 0; for (i = 10; 13 >= i; i++) sum += i; if (sum != 46) failed = true;
+  sum = 0; for (i = 10; i != 14; i++) sum += i; if (sum != 46) failed = true;
+  sum = 0; for (i = 10; 14 != i; i++) sum += i; if (sum != 46) failed = true;
+  sum = 0; for (i = 10; i == 10; i++) sum += i; if (sum != 10) failed = true;
+  sum = 0; for (i = 10; 10 == i; i++) sum += i; if (sum != 10) failed = true;
+
+  sum = 0; for (i = 13; i > 9; i--) sum += i; if (sum != 46) failed = true;
+  sum = 0; for (i = 13; i >= 10; i--) sum += i; if (sum != 46) failed = true;
+  sum = 0; for (i = 13; 9 < i; i--) sum += i; if (sum != 46) failed = true;
+  sum = 0; for (i = 13; 10 <= i; i--) sum += i; if (sum != 46) failed = true;
+  sum = 0; for (i = 13; i != 9; i--) sum += i; if (sum != 46) failed = true;
+  sum = 0; for (i = 13; 9 != i; i--) sum += i; if (sum != 46) failed = true;
+  sum = 0; for (i = 13; i == 13; i--) sum += i; if (sum != 13) failed = true;
+  sum = 0; for (i = 13; 13 == i; i--) sum += i; if (sum != 13) failed = true;
+
+  gl_FragColor = failed ? vec4(1.0, 0.0, 0.0, 1.0) : vec4(0.0, 1.0, 0.0, 1.0);
+}
+
+[test]
+draw rect -1 -1 2 2
+probe all rgba 0.0 1.0 0.0 1.0
diff --git a/tests/spec/glsl-1.10/execution/vs-loop-bounds-unrolled.shader_test b/tests/spec/glsl-1.10/execution/vs-loop-bounds-unrolled.shader_test
new file mode 100644
index 0000000..c9d47f3
--- /dev/null
+++ b/tests/spec/glsl-1.10/execution/vs-loop-bounds-unrolled.shader_test
@@ -0,0 +1,41 @@
+# This test contains a variety of loops that are likely to be unrolled
+# by the implementation, and verifies that they all execute correctly.
+
+[vertex shader]
+void main()
+{
+  gl_Position = gl_Vertex;
+  int sum;
+  int i;
+  bool failed = false;
+
+  sum = 0; for (i = 10; i < 14; i++) sum += i; if (sum != 46) failed = true;
+  sum = 0; for (i = 10; i <= 13; i++) sum += i; if (sum != 46) failed = true;
+  sum = 0; for (i = 10; 14 > i; i++) sum += i; if (sum != 46) failed = true;
+  sum = 0; for (i = 10; 13 >= i; i++) sum += i; if (sum != 46) failed = true;
+  sum = 0; for (i = 10; i != 14; i++) sum += i; if (sum != 46) failed = true;
+  sum = 0; for (i = 10; 14 != i; i++) sum += i; if (sum != 46) failed = true;
+  sum = 0; for (i = 10; i == 10; i++) sum += i; if (sum != 10) failed = true;
+  sum = 0; for (i = 10; 10 == i; i++) sum += i; if (sum != 10) failed = true;
+
+  sum = 0; for (i = 13; i > 9; i--) sum += i; if (sum != 46) failed = true;
+  sum = 0; for (i = 13; i >= 10; i--) sum += i; if (sum != 46) failed = true;
+  sum = 0; for (i = 13; 9 < i; i--) sum += i; if (sum != 46) failed = true;
+  sum = 0; for (i = 13; 10 <= i; i--) sum += i; if (sum != 46) failed = true;
+  sum = 0; for (i = 13; i != 9; i--) sum += i; if (sum != 46) failed = true;
+  sum = 0; for (i = 13; 9 != i; i--) sum += i; if (sum != 46) failed = true;
+  sum = 0; for (i = 13; i == 13; i--) sum += i; if (sum != 13) failed = true;
+  sum = 0; for (i = 13; 13 == i; i--) sum += i; if (sum != 13) failed = true;
+
+  gl_FrontColor = failed ? vec4(1.0, 0.0, 0.0, 1.0) : vec4(0.0, 1.0, 0.0, 1.0);
+}
+
+[fragment shader]
+void main()
+{
+  gl_FragColor = gl_Color;
+}
+
+[test]
+draw rect -1 -1 2 2
+probe all rgba 0.0 1.0 0.0 1.0
-- 
1.8.1