SQSHLU

Signed saturating Shift Left Unsigned (immediate). This instruction reads each signed integer value in the vector of the source SIMD&FP register, shifts each value by an immediate value, saturates the shifted result to an unsigned integer value, places the result in a vector, and writes the vector to the destination SIMD&FP register. The results are truncated. For rounded results, see UQRSHL.

If saturation occurs, the cumulative saturation bit FPSR.QC is set.

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 == '0000' then UNDEFINED; constant integer esize = 8 << HighestSetBit(immh); constant integer datasize = esize; integer elements = 1; integer shift = UInt(immh:immb) - esize; boolean src_unsigned; boolean dst_unsigned; case op:U of when '00' UNDEFINED; when '01' src_unsigned = FALSE; dst_unsigned = TRUE; when '10' src_unsigned = FALSE; dst_unsigned = FALSE; when '11' src_unsigned = TRUE; dst_unsigned = TRUE;

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; boolean src_unsigned; boolean dst_unsigned; case op:U of when '00' UNDEFINED; when '01' src_unsigned = FALSE; dst_unsigned = TRUE; when '10' src_unsigned = FALSE; dst_unsigned = FALSE; when '11' src_unsigned = TRUE; dst_unsigned = TRUE;