ALXD800EEXJ2VD AMD (ADVANCED MICRO DEVICES), ALXD800EEXJ2VD Datasheet - Page 668

• Manufacturer Part Number: ALXD800EEXJ2VD
• Manufacturer: AMD (ADVANCED MICRO DEVICES)

Specifications of ALXD800EEXJ2VD

• Operating Temperature (min): 0C
• Operating Temperature (max): 85C
• Operating Temperature Classification: Commercial
• Mounting: Surface Mount
• Lead Free Status / RoHS Status: Compliant

8.4.1
8.4.1.1
Operation
DEST[31:0] <= reciprocal(SRC[31:0]);
DEST[63:32] <= RECIPROCAL(SRC[63:32]);
Description
PFRCPV performs the same operation as the PFRCP instruction except that PFRCPV operates on both halves of its oper-
ands, while PFRCP operates on only bits [31:0] of its operand.
Flags Affected
None.
Exceptions
#GP(0)
#SS(0)
#PF(code)
#AC
#UD
Notes
This instruction is enabled by the INV_3DNOW_ENABLE bit (bit 1) of the ID_CONFIG MSR (MSR 00001250h).
8.4.1.2
Operation
Description
PFRSQRTV performs the same operation as the PFRSQRT instruction except that PFRSQRTV operates on both halves of
its operands, while PFSQRT operates on only bits [31:0] of its operand.
Flags Affected
None.
Exceptions
#GP(0)
#SS(0)
#PF(code)
#AC
#UD
Notes
This instruction is enabled by the INV_3DNOW_ENABLE bit (bit 1) of the ID_CONFIG MSR (MSR 00001250h).
668
DEST[31:0] <= reciprocal_SQUARE_ROOT(SRC[31:0]);
DEST[63:32] <= RECIPROCAL_SQUARE_ROOT(SRC[63:32]);
Opcode
0F 0F / 86
Opcode
0F 0F / 87
PFRSQRTV - Floating-Point Reciprocal Square Root Approximation
Non-Standard 3DNow!™ Technology Instructions
PFRCPV - Floating-Point Reciprocal Approximation
If a memory operand is illegal and not in SS.
If memory operand is illegal and in SS.
Page fault.
Unaligned access.
Illegal opcode.
If a memory operand is illegal and not in SS.
If memory operand is illegal and in SS.
Page fault.
Unaligned access.
Illegal opcode.
Instruction
PFRCPV xr,xr/m64
Instruction
PFRSQRTV xr,xr/m64
33234C
Clocks
2
Clocks
2
Description
Approximate reciprocal
Description
Approximate reciprocal square root
AMD Geode™ LX Processors Data Book
Instruction Set