Parallel Multiply and Shift Right InstructionParallel Multiply and Shift Right Instructionpmpyshr
Instruction Type I
Format
(qp) pmpyshr2 r1 = r2, r3, count2 signed_form
(qp) pmpyshr2.u r1 = r2, r3, count2 unsigned_form
Description
The four 16-bit data elements of GR r2 are multiplied by the corresponding four 16-bit data elements of GR r3 as shown in the figure below. This multiplication can either be signed (pmpyshr2), or unsigned (pmpyshr2.u). Each product is then shifted to the right count2 bits, and the least-significant 16-bits of each shifted product form 4 16-bit results, which are placed in GR r1. A count2 of 0 gives the 16 low bits of the results, a count2 of 16 gives the 16 high bits of the results.
Click to see an example of how the parallel multiply and shift right instruction works.
Bit Field and Shift Instructions
fma - Floating-point Multiply Add Instruction
fnma - Floating-point Negative Multiply Add Instruction
fnmpy - Floating-point Negative Multiply 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
pavg - Parallel Average Instruction
pavgsub - Parallel Average Subtract Instruction
pcmp - Parallel Compare Instruction
pmax - Parallel Maximum Instruction
pmin - Parallel Minimum Instruction
pmpy - Parallel Multiply Instruction
psad1 - Parallel Sum of Absolute Difference Instruction
pshl - Parallel Shift Left Instruction
pshladd - Parallel Shift Left and Add Instruction
pshradd - Parallel Shift Right and Add Instruction
psub - Parallel Subtract Instruction
shladd - Shift Left and Add Instruction
shladdp - Shift Left and Add Pointer Instruction