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This patch optimizes the creation of constant 64-bit vectors (e.g., v2i32, v4i16) by avoiding expensive loads from the constant pool. The optimization works by packing the constant vector elements into a single i64 immediate and bitcasting the result to the target vector type. This replaces a memory access with more efficient immediate materialization. To ensure this transformation is efficient, a check is performed to verify that the immediate can be generated in two or fewer mov instructions. If it requires more, the compiler falls back to using the constant pool. The optimization is disabled for bigendian targets for now.
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