To avoid an infinite loop. See code comments for details.
---
tests/spec/gl-1.0/blend.c | 39 +++++++++++++++++++++++++++++++++++++++
1 file changed, 39 insertions(+)
diff --git a/tests/spec/gl-1.0/blend.c b/tests/spec/gl-1.0/blend.c
index 35e940f..e69ed31 100644
--- a/tests/spec/gl-1.0/blend.c
+++ b/tests/spec/gl-1.0/blend.c
@@ -76,6 +76,9 @@ static int test_stride = 1;
#define img_width drawing_size
#define img_height drawing_size
+static bool using_llvm_3_8 = false;
+
+
PIGLIT_GL_TEST_CONFIG_BEGIN
config.supports_gl_compat_version = 10;
@@ -177,6 +180,10 @@ image_init(struct image *image)
GL_RGBA, GL_FLOAT, image->data);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_NEAREST);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_NEAREST);
+
+ if (strstr("LLVM 3.8", (const char *) glGetString(GL_RENDERER)) == 0) {
+ using_llvm_3_8 = true;
+ }
} /* image_init */
@@ -532,6 +539,32 @@ apply_blend(GLenum src_factor_rgb, GLenum src_factor_a,
} /* apply_blend */
+/**
+ * With unpactched LLVM 3.8, llvmpipe can hit an bug in LLVM which results
+ * in an infinite loop. See https://bugs.llvm.org/show_bug.cgi?id=27689
+ * This function tries to determine if the test case will hit that bug so
+ * we can skip the test.
+ */
+bool
+skip_on_llvmpipe(GLenum src_factor_rgb, GLenum src_factor_a,
+ GLenum dst_factor_rgb, GLenum dst_factor_a)
+{
+ if (!using_llvm_3_8)
+ return false;
+
+ /* This could probably be a bit tighter, but this seems to catch
+ * the troublesome cases.
+ */
+ if (src_factor_rgb == GL_CONSTANT_COLOR ||
+ dst_factor_rgb == GL_CONSTANT_COLOR ||
+ dst_factor_a == GL_CONSTANT_COLOR ||
+ dst_factor_a == GL_CONSTANT_ALPHA)
+ return true;
+
+ return false;
+}
+
+
/* Test for one set of factor levels */
bool
run_factor_set(GLenum src_factor_rgb, GLenum src_factor_a,
@@ -542,6 +575,12 @@ run_factor_set(GLenum src_factor_rgb, GLenum src_factor_a,
int i, j;
bool pass = true, p;
+ if (skip_on_llvmpipe(src_factor_rgb, src_factor_a,
+ dst_factor_rgb, dst_factor_a))
{
+ /*printf("Skipping Blend test to avoid LLVM bug\n");*/
+ return true;
+ }
+
glDisable(GL_DITHER);
glClear(GL_COLOR_BUFFER_BIT);
--
2.7.4
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