Compare the lower double-precision (64-bit) floating-point element in a and b based on the comparison operand specified by imm8, store the result in the lower element of result, and copy the upper element from a to the upper element of result.
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Compare the lower double-precision (64-bit) floating-point element in a and b based on the comparison operand specified by imm8, store the result in the lower element of result, and copy the upper element from a to the upper element of result.