x86 Instruction Set Reference

SQRTSS - Compute Square Root of Scalar Single-Precision Floating-Point Value

Opcode Mnemonic Description
F3 0F 51 /r SQRTSS xmm1, xmm2/m32 Compute the square root of the low single-precision floating-point value in xmm2/m32 and store the results in xmm1.
Description

Computes the square root of the low single-precision floating-point value in the source operand (second operand) and stores the single-precision floating-point result in the destination operand.

The source operand can be an XMM register or a 32-bit memory location. The destination operand is an XMM register. The three high-order doublewords of the destination operand remain unchanged. See Figure 10-6 in the IA-32 Intel Architecture Software Developer's Manual, Volume 1 for an illustration of a scalar single-precision floating-point operation.
Operation 
Destination[0..31] = SquareRoot(Source[0..31]);
//Destination[64..127] remains unchanged
Instruction Latency Throughput Execution Unit
CPUID0F3n/0F2n/069n0F3n/0F2n/069n0F2n
SQRTSS xmm, xmm32/23/3032/23/29FP_DIV