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Paul Berry authored
This patch adds two tests that exercise a subtle corner case bug found in Mesa with i965: If a value is negated, and then negated again, then copy propagation would fail to un-do the negation. The bug only exists on i965 vertex shaders, but I went ahead and added the equivalent fragment shader test for completeness. Reviewed-by: Ian Romanick <ian.d.romanick@intel.com>
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