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-rw-r--r--src/gallium/include/pipe/p_state.h12
1 files changed, 11 insertions, 1 deletions
diff --git a/src/gallium/include/pipe/p_state.h b/src/gallium/include/pipe/p_state.h
index 1543e90972e..5526c392aa7 100644
--- a/src/gallium/include/pipe/p_state.h
+++ b/src/gallium/include/pipe/p_state.h
@@ -326,7 +326,17 @@ struct pipe_blend_state
struct pipe_blend_color
{
- float color[4];
+ /**
+ * Making the color array explicitly 16-byte aligned provides a hint to
+ * compilers to make more efficient auto-vectorization optimizations.
+ * The actual performance gains from vectorizing the blend color array are
+ * fairly minimal, if any, but the alignment is necessary to work around
+ * buggy vectorization in some compilers which fail to generate the correct
+ * unaligned accessors resulting in a segfault. Specifically several
+ * versions of the Intel compiler are known to be affected but it's likely
+ * others are as well.
+ */
+ PIPE_ALIGN_VAR(16) float color[4];
};