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- Detect code paths in non-void functions that don't reach a return statement
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- Improve handling of constants and their initializers. Constant initializers
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should never generate any code. This is trival for scalar constants. It is
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also trivial for arrays, matrices, and vectors that are accessed with
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constant index values. For others it is more complicated. Perhaps these
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cases should be silently converted to uniforms?
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- Track source locations throughout the IR. There are currently several
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places where we cannot emit line numbers for errors (and currently emit 0:0)
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because we've "lost" the line number information. This is particularly
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noticeable at link time.