SQDECD (vector)

Signed saturating decrement vector by multiple of 64-bit predicate constraint element count

Determines the number of active 64-bit elements implied by the named predicate constraint, multiplies that by an immediate in the range 1 to 16 inclusive, and then uses the result to decrement all destination vector elements. The results are saturated to the 64-bit signed integer range.

The named predicate constraint limits the number of active elements in a single predicate to:

• A fixed number (VL1 to VL256)
• The largest power of two (POW2)
• The largest multiple of three or four (MUL3 or MUL4)
• All available, implicitly a multiple of two (ALL).

Unspecified or out of range constraint encodings generate an empty predicate or zero element count rather than Undefined Instruction exception.

if !IsFeatureImplemented(FEAT_SVE) && !IsFeatureImplemented(FEAT_SME) then UNDEFINED; constant integer esize = 64; constant integer dn = UInt(Zdn); constant bits(5) pat = pattern; constant integer imm = UInt(imm4) + 1; constant boolean unsigned = FALSE;