Parallel Average InstructionParallel Average Instructionpavg
Instruction Type A
Format
(qp) pavg1 r1 = r2, r3 normal form, one_byte_form
(qp) pavg1 raz r1 = r2, r3 raz form, one_byte_form
(qp) pavg2 r1 = r2, r3 two_byte_form
(qp) pavg2 raz r1 = r2, r3 raz form, two_byte_form
Description
The unsigned data elements of GR r2 are added to the unsigned data elements of GR r3. The results of the add are then each independently shifted to the right by one bit position. The high-order bits of each element are filled with the carry bits of the sums. To prevent cumulative round-off errors, an averaging is performed. The unsigned results are placed in GR r1.
The averaging operation works as follows. In the normal_form, the low-order bit of each result is set to 1 if at least one of the two least significant bits of the corresponding sum is 1. In the raz_form, the average rounds away from zero by adding 1 to each of the sums.
Click to see an example of the two_byte form of the parallel average instruction.
fpabs - Floating-point Parallel Absolute Value Instruction
fpamax - Floating-point Parallel Absolute Value Maximum Instruction
fpamin - Floating-point Parallel Absolute Value Minimum Instruction
fpcmp - Floating-point Parallel Compare Instruction
fpcvt.fx - Convert Parallel Floating-point to Integer Instruction
fpma - Floating-point Parallel Multiply Add Instruction
fpmax - Floating-point Parallel Maximum Instruction
fpmerge - Floating-point Parallel Merge Instructions
fpmin - Floating-point Parallel Minimum Instruction
fpmpy - Floating-point Parallel Multiply Instruction
fpms - Floating-point Parallel Multiply Subtract Instruction
fpneg - Floating-point Parallel Negate Instruction
fpnegabs - Floating-point Parallel Negate Absolute Value Instruction
fpnma - Floating-point Parallel Negative Multiply Add Instruction
fpnmpy - Floating-point Parallel Negative Multiply Instruction
fprcpa - Floating-point Parallel Reciprocal Approximation Instruction
fprsqrta - Floating-point Parallel Reciprocal Square Root Approximation Instruction
Integer Multiply and Add (in FP Unit) Instructions
mov gr - Move General Register Instruction
mov imm - Move Immediate Instruction
padd - Parallel Add Instruction
Parallel Arithmetic Instructions
Parallel Data Arrangement Instructions
pavgsub - Parallel Average Subtract Instruction
pcmp - Parallel Compare Instruction
pmax - Parallel Maximum Instruction
pmin - Parallel Minimum Instruction
pmpy - Parallel Multiply Instruction
pmpyshr - Parallel Multiply and Shift Right Instruction
psad1 - Parallel Sum of Absolute Difference Instruction
pshl - Parallel Shift Left Instruction