PFRCP
Usage: PFRCP dest,src Modifies flags: None
Returns a low-precision estimate of the reciprocal of the source operand. The single result value is duplicated in both high and low halves of this instruction's 64-bit result. The source operand is single-precision with a 24-bit significand.
Packed Single-Precision FP Reciprocal Approximation
PFRCP mm1,mm2/m64 ; 0F 0F /r 96 [PENT,3DNOW]
PFRCP performs a low precision estimate of the reciprocal of the low-order single-precision FP value in the source operand, storing the result in both halves of the destination register. The result is accurate to 14 bits.
For higher precision reciprocals, this instruction should be followed by two more instructions: PFRCPIT1 and PFRCPIT2. This will result in a 24-bit accuracy. For more details, see the AMD 3DNow! technology manual.
Example:
pfrcp mm1 mm2
PFRCP
Usage: PFRCP dest,src Modifies flags: None
Returns a low-precision estimate of the reciprocal of the source operand. The single result value is duplicated in both high and low halves of this instruction's 64-bit result. The source operand is single-precision with a 24-bit significand.
Packed Single-Precision FP Reciprocal Approximation
PFRCP mm1,mm2/m64 ; 0F 0F /r 96 [PENT,3DNOW]
PFRCP performs a low precision estimate of the reciprocal of the low-order single-precision FP value in the source operand, storing the result in both halves of the destination register. The result is accurate to 14 bits.
For higher precision reciprocals, this instruction should be followed by two more instructions: PFRCPIT1 and PFRCPIT2. This will result in a 24-bit accuracy. For more details, see the AMD 3DNow! technology manual.
Example:
pfrcp mm1 mm2
PFRCP
Usage: PFRCP dest,src Modifies flags: None
Returns a low-precision estimate of the reciprocal of the source operand. The single result value is duplicated in both high and low halves of this instruction's 64-bit result. The source operand is single-precision with a 24-bit significand.
Packed Single-Precision FP Reciprocal Approximation
PFRCP mm1,mm2/m64 ; 0F 0F /r 96 [PENT,3DNOW]
PFRCP performs a low precision estimate of the reciprocal of the low-order single-precision FP value in the source operand, storing the result in both halves of the destination register. The result is accurate to 14 bits.
For higher precision reciprocals, this instruction should be followed by two more instructions: PFRCPIT1 and PFRCPIT2. This will result in a 24-bit accuracy. For more details, see the AMD 3DNow! technology manual.
Example:
pfrcp mm1 mm2