3-598
INSTRUCTION SET REFERENCE
RCPSS—Scalar Single-FP Reciprocal
Description
RCPSS returns an approximation of the reciprocal of the lower SP FP number from xmm2/m32;
the upper three fields are passed through from xmm1. The maximum error for this approxima-
tion is:
|Error| <= 1.5x2
-12
Figure 3-87. Operation of the RCPSS Instruction
Operation
DEST[31-0] = APPROX (1.0/(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,53,/rRCPSS xmm1, xmm2/m32Return an approximation of the reciprocal of the lower
SP FP number in XMM2/Mem.
Xmm1
Xmm2/
m128
Xmm1
RCPSS xmm1,xmm2/m128
=
