[Piglit] [PATCH] glsl-1.20: add test to tickle copy propagation bug in st/mesa

[Ilia Mirkin]

The copy propagation pass didn't properly deal with arrays, which caused
it to merge b[1] and a[1] even though a[1] is modified after the initial
assignment.

Test taken verbatim from

https://www.khronos.org/registry/webgl/conformance-suites/1.0.2/conformance/ogles/GL/functions/array_float_frag.frag

Signed-off-by: Ilia Mirkin <imirkin at alum.mit.edu>
---
 .../fs-array-deref-then-write.shader_test          | 99 ++++++++++++++++++++++
 1 file changed, 99 insertions(+)
 create mode 100644 tests/spec/glsl-1.20/execution/fs-array-deref-then-write.shader_test

diff --git a/tests/spec/glsl-1.20/execution/fs-array-deref-then-write.shader_test b/tests/spec/glsl-1.20/execution/fs-array-deref-then-write.shader_test
new file mode 100644
index 0000000..7e4ab98
--- /dev/null
+++ b/tests/spec/glsl-1.20/execution/fs-array-deref-then-write.shader_test
@@ -0,0 +1,99 @@
+# Copyright (c) 2012 The Khronos Group Inc.
+#
+# Permission is hereby granted, free of charge, to any person obtaining a
+# copy of this software and/or associated documentation files (the
+# "Materials"), to deal in the Materials without restriction, including
+# without limitation the rights to use, copy, modify, merge, publish,
+# distribute, sublicense, and/or sell copies of the Materials, and to
+# permit persons to whom the Materials are furnished to do so, subject to
+# the following conditions:
+#
+# The above copyright notice and this permission notice shall be included
+# in all copies or substantial portions of the Materials.
+#
+# THE MATERIALS ARE PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
+# EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
+# MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
+# IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY
+# CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
+# TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
+# MATERIALS OR THE USE OR OTHER DEALINGS IN THE MATERIALS.
+
+[require]
+GLSL >= 1.20
+
+[vertex shader passthrough]
+
+[fragment shader]
+void qualifiers(in float a[4], out float b[4], inout float c[4], const in float d[4], float e[4])
+{
+	b[0] = a[0];
+	c[0] += d[0];
+	a[0] += 1.0;
+	e[0] += 1.0;
+
+	b[1] = a[1];
+	c[1] += d[1];
+	a[1] += 1.0;
+	e[1] += 1.0;
+
+	b[2] = a[2];
+	c[2] += d[2];
+	a[2] += 1.0;
+	e[2] += 1.0;
+
+	b[3] = a[3];
+	c[3] += d[3];
+	a[3] += 1.0;
+	e[3] += 1.0;
+}
+
+void main (void)
+{
+	float a[4];
+	float b[4];
+	float c[4];
+	float d[4];
+	float e[4];
+	float q = 0.0;
+	float q2 = 0.0;
+
+	a[0] = 1.0;
+	b[0] = 2.0;
+	c[0] = 3.0;
+	d[0] = 4.0;
+	e[0] = 1.0;
+
+	a[1] = 1.0;
+	b[1] = 2.0;
+	c[1] = 3.0;
+	d[1] = 4.0;
+	e[1] = 1.0;
+
+	a[2] = 1.0;
+	b[2] = 2.0;
+	c[2] = 3.0;
+	d[2] = 4.0;
+	e[2] = 1.0;
+
+	a[3] = 1.0;
+	b[3] = 2.0;
+	c[3] = 3.0;
+	d[3] = 4.0;
+	e[3] = 1.0;
+
+	qualifiers(a, b, c, d, e);
+
+	// randomly test a value
+	if(a[0] == 1.0) q += 1.0;
+	if(b[1] == 1.0) q += 2.0;
+	if(c[2] == 7.0) q += 4.0;
+	if(d[3] == 4.0) q2 += 1.0;
+	if(e[0] == 1.0) q2 += 2.0;
+
+	gl_FragColor = vec4(vec2(q / 7.0, q2 / 3.0), 1.0, 1.0);
+}
+
+[test]
+draw rect -1 -1 2 2
+probe all rgba 1 1 1 1
-- 
2.0.5