[Piglit] [PATCH] Add glsl-1.30/execution/fs-loop-cont-else-bug

[Tapani Pälli]

x goes like 7 .. 22 .. 11 .. then we break out (as idx >= 3) and in the 
end 11 % 5 * 0.25 is 0.75 .. LGTM

Reviewed-by: Tapani Pälli <tapani.palli at intel.com>

On 09/28/2016 11:01 PM, Nicolai Hähnle wrote:
> From: Nicolai Hähnle <nicolai.haehnle at amd.com>
>
> This is a regression test for a very specific compiler bug in radeonsi.
>
> Bugzilla: https://bugs.freedesktop.org/show_bug.cgi?id=97887
> ---
>  .../execution/fs-loop-cont-else-bug.shader_test    | 44 ++++++++++++++++++++++
>  1 file changed, 44 insertions(+)
>  create mode 100644 tests/spec/glsl-1.30/execution/fs-loop-cont-else-bug.shader_test
>
> diff --git a/tests/spec/glsl-1.30/execution/fs-loop-cont-else-bug.shader_test b/tests/spec/glsl-1.30/execution/fs-loop-cont-else-bug.shader_test
> new file mode 100644
> index 0000000..f66c95e
> --- /dev/null
> +++ b/tests/spec/glsl-1.30/execution/fs-loop-cont-else-bug.shader_test
> @@ -0,0 +1,44 @@
> +# This test used to create bad LLVM IR in radeonsi.
> +#
> +# Bugzilla: https://bugs.freedesktop.org/show_bug.cgi?id=97887
> +
> +[require]
> +GLSL >= 1.30
> +
> +[vertex shader passthrough]
> +
> +[fragment shader]
> +#version 130
> +
> +uniform int initial;
> +
> +void main() {
> +	int idx = 0;
> +	int x = initial;
> +
> +	for (;;) {
> +		idx++;
> +		if (idx >= 3)
> +			break;
> +
> +		if (x % 2 == 0) {
> +			x = x / 2;
> +			if (x == 18)
> +				break;
> +			continue;
> +		} else {
> +			x = x * 3;
> +		}
> +		x++;
> +	}
> +
> +	gl_FragColor = vec4(0.0, (x % 4) * 0.25, 0.0, 1.0);
> +}
> +
> +[test]
> +clear color 1.0 0.0 0.0 1.0
> +clear
> +
> +uniform int initial 7
> +draw rect -1 -1 2 2
> +probe all rgba 0.0 0.75 0.0 1.0
>