v2: Subtract return value from 31 to get the count in LSB terms.
Call nonexistent bad_constant_folding() function if test fails.
---
.../built-in-functions/const-findMSB.shader_test | 58 ++++++++++++++++++++++
1 file changed, 58 insertions(+)
create mode 100644
tests/spec/arb_gpu_shader5/execution/built-in-functions/const-findMSB.shader_test
diff --git
a/tests/spec/arb_gpu_shader5/execution/built-in-functions/const-findMSB.shader_test
b/tests/spec/arb_gpu_shader5/execution/built-in-functions/const-findMSB.shader_test
new file mode 100644
index 0000000..fec20f1
--- /dev/null
+++
b/tests/spec/arb_gpu_shader5/execution/built-in-functions/const-findMSB.shader_test
@@ -0,0 +1,58 @@
+[require]
+GLSL >= 1.50
+GL_ARB_gpu_shader5
+
+[vertex shader]
+in vec4 vertex;
+
+void main() {
+ gl_Position = vertex;
+}
+
+[fragment shader]
+#extension GL_ARB_gpu_shader5 : enable
+
+void bad_constant_folding();
+
+out vec4 color;
+
+void main()
+{
+ /* Green if both pass. */
+ color = vec4(0.0, 1.0, 0.0, 1.0);
+
+ if (ivec4(-1) != findMSB(ivec4(0, -1, -1, 0)))
+ bad_constant_folding();
+
+ if (ivec4(-1) != findMSB(uvec4(0u)))
+ bad_constant_folding();
+
+ if (ivec4(0, 1, 1, 2) != findMSB(ivec4(1, 2, 3, 4)))
+ bad_constant_folding();
+
+ if (ivec4(30, 29, 28, 27) != findMSB(ivec4(2147483647, 1073741823,
536870911, 268435455)))
+ bad_constant_folding();
+
+ if (ivec4(0, 1, 2, 3) != findMSB(ivec4(-2, -3, -5, -9)))
+ bad_constant_folding();
+
+ if (ivec4(30, 30, 29, 28) != findMSB(ivec4(-2147483648, -1879048192,
-1073741824, -536870912)))
+ bad_constant_folding();
+
+ if (ivec4(0, 1, 1, 2) != findMSB(uvec4(1u, 2u, 3u, 4u)))
+ bad_constant_folding();
+
+ if (ivec4(31, 30, 29, 28) != findMSB(uvec4(0xFFFFFFFFu, 0x7FFFFFFFu,
0x3FFFFFFFu, 0x1FFFFFFFu)))
+ bad_constant_folding();
+}
+
+[vertex data]
+vertex/float/2
+-1.0 -1.0
+ 1.0 -1.0
+ 1.0 1.0
+-1.0 1.0
+
+[test]
+draw arrays GL_TRIANGLE_FAN 0 4
+probe all rgba 0.0 1.0 0.0 1.0
--
1.8.1.5
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