Specifications

Intel
®
64 and IA-32 Architectures Software Developer’s Manual Documentation Changes 164
Documentation Changes
RCPSS—Compute Reciprocal of Scalar Single-Precision Floating-Point
Values
Instruction Operand Encoding
...
RDMSR—Read from Model Specific Register
Instruction Operand Encoding
...
RDPMC—Read Performance-Monitoring Counters
Opcode* Instruction Op/
En
64-Bit
Mode
Compat/
Leg Mode
Description
F3 0F 53 /r RCPSS xmm1,
xmm2/m32
A Valid Valid Computes the approximate
reciprocal of the scalar
single-precision floating-
point value in xmm2/m32
and stores the result in
xmm1.
Op/En Operand 1 Operand 2 Operand 3 Operand 4
A ModRM:reg (w) ModRM:r/m (r) NA NA
Opcode* Instruction Op/
En
64-Bit
Mode
Compat/
Leg Mode
Description
0F 32 RDMSR A Valid Valid Read MSR specified by ECX
into EDX:EAX.
NOTES:
* See IA-32 Architecture Compatibility section below.
Op/En Operand 1 Operand 2 Operand 3 Operand 4
ANA NA NA NA
Opcode* Instruction Op/
En
64-Bit
Mode
Compat/
Leg Mode
Description
0F 33 RDPMC A Valid Valid Read performance-
monitoring counter
specified by ECX into
EDX:EAX.