Square root (double precision) (Floating-point Square Root (Double))
This instruction obtains the arithmetic positive square root of the double-precision floating-point format contents of the register pair specified by general-purpose register reg1, and stores the result in the register pair specified by general-purpose register reg2. The operation is executed as if it were of infinite accuracy, and the result is rounded in accordance with the current rounding mode. When the source operand value is -0, the result becomes -0.