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shader: Fold UnpackFloat2x16 and PackFloat2x16
Simplifies the code a bit when possible. These instructions should be no-ops codegen wise.
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@ -476,6 +476,10 @@ void ConstantPropagation(IR::Block& block, IR::Inst& inst) {
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return FoldInverseFunc(inst, IR::Opcode::UnpackHalf2x16);
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case IR::Opcode::UnpackHalf2x16:
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return FoldInverseFunc(inst, IR::Opcode::PackHalf2x16);
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case IR::Opcode::PackFloat2x16:
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return FoldInverseFunc(inst, IR::Opcode::UnpackFloat2x16);
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case IR::Opcode::UnpackFloat2x16:
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return FoldInverseFunc(inst, IR::Opcode::PackFloat2x16);
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case IR::Opcode::SelectU1:
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case IR::Opcode::SelectU8:
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case IR::Opcode::SelectU16:
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