SHL

Shift Left (immediate). This instruction reads each value from a vector, left shifts each result by an immediate value, writes the final result to a vector, and writes the vector to the destination SIMD&FP register.

Depending on the settings in the CPACR_EL1, CPTR_EL2, and CPTR_EL3 registers, and the current Security state and Exception level, an attempt to execute the instruction might be trapped.

It has encodings from 2 classes: Scalar and Vector

Scalar

integer d = UInt(Rd); integer n = UInt(Rn); if immh<3> != '1' then UNDEFINED; constant integer esize = 8 << 3; constant integer datasize = esize; integer elements = 1; integer shift = UInt(immh:immb) - esize;

Vector

integer d = UInt(Rd); integer n = UInt(Rn); if immh == '0000' then SEE(asimdimm); if immh<3>:Q == '10' then UNDEFINED; constant integer esize = 8 << HighestSetBit(immh); constant integer datasize = 64 << UInt(Q); integer elements = datasize DIV esize; integer shift = UInt(immh:immb) - esize;