# SQRTSD
# Compute Square Root of Scalar Double-Precision Floating-Point Value
| Opcode | Mnemonic | Description |
|---|---|---|
| F2 0F 51 /r | SQRTSD xmm1, xmm2/m64 | Compute the square root of the low double-precision floating-point value in xmm2/m64 and store the results in xmm1. |
# Description
Computes the square root of the low double-precision floating-point value in the source operand (second operand) and stores the double-precision floating-point result in the destination operand. The source operand can be an XMM register or a 64-bit memory location. The destination operand is an XMM register. The high quadword of the destination operand remains unchanged. See Figure 11-4 in the IA-32 Intel Architecture Software Developer's Manual, Volume 1 for an illustration of a scalar double-precision floating-point operation.
# Operation
Destination[0..63] = SquareRoot(Source[0..63]);
//Destination[64..127] remains unchanged
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| Instruction | Latency | Throughput | Execution Unit |
|---|---|---|---|
| CPUID | 0F3n/0F2n/069n | 0F3n/0F2n/069n | 0F2n |
| SQRTSD xmm, xmm | 39/38/58 | 39/38/57 | FP_DIV |