3-619
INSTRUCTION SET REFERENCE
RSQRTSSÂScalar Single-FP Square Root Reciprocal
Description
RSQRTSS returns an approximation of the reciprocal of the square root of the lowest SP FP
number from xmm2/m32; the upper three fields are passed through from xmm1. The maximum
error for this approximation is:
|Error| <= 1.5x2
-12
Figure 3-89. Operation of the RSQRTSS Instruction
Operation
DEST[31-0] = APPROX (1.0/SQRT(SRC/m32[31-0]));
DEST[63-32] = DEST[63-32];
DEST[95-64] = DEST[95-64];
DEST[127-96] = DEST[127-96];
OpcodeInstruction
Description
F3,0F,52,/rRSQRTSS xmm1,
xmm2/m32
Return an approximation of the square root of the reciprocal
of the lowest SP FP number in XMM2/Mem.
Xmm1
Xmm2/
m32
Xmm1
RSQRTSS xmm1, xmm2/m32
=
