Intel 64 and IA-32 Architectures Software Developers Manual Volume 2B, Instruction Set Reference, N-Z

Vol. 2B 4-327
INSTRUCTION SET REFERENCE, N-Z
SQRTSS—Compute Square Root of Scalar Single-Precision Floating-
Point Value
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 Intel
®
64 and IA-32 Architectures Software Developer’s Manual, Volume 1, for an
illustration of a scalar single-precision floating-point operation.
In 64-bit mode, using a REX prefix in the form of REX.R permits this instruction to
access additional registers (XMM8-XMM15).
Operation
DEST[31:0] ← SQRT (SRC[31:0]);
(* DEST[127:64] unchanged *)
Intel C/C++ Compiler Intrinsic Equivalent
SQRTSS __m128 _mm_sqrt_ss(__m128 a)
SIMD Floating-Point Exceptions
Invalid, Precision, Denormal.
Protected Mode Exceptions
#GP(0) For an illegal memory operand effective address in the CS, DS,
ES, FS or GS segments.
#SS(0) For an illegal address in the SS segment.
#PF(fault-code) For a page fault.
#NM If CR0.TS[bit 3] = 1.
#XM If an unmasked SIMD floating-point exception and CR4.OSXM-
MEXCPT[bit 10] = 1.
Opcode Instruction
64-Bit
Mode
Compat/
Leg Mode Description
F3 0F 51
/r
SQRTSS xmm1,
xmm2/m32
Valid Valid Computes square root of the low
single-precision floating-point
value in xmm2/m32 and stores
the results in xmm1.