p.To.Sym = ssagen.BoundsCheckFunc[v.AuxInt]
		s.UseArgs(8) // space used in callee args area by assembly stubs

	case ssa.Op386LoweredPanicExtendA, ssa.Op386LoweredPanicExtendB, ssa.Op386LoweredPanicExtendC:
		p := s.Prog(obj.ACALL)
		p.To.Type = obj.TYPE_MEM
		p.To.Name = obj.NAME_EXTERN
		p.To.Sym = ssagen.ExtendCheckFunc[v.AuxInt]
		s.UseArgs(12) // space used in callee args area by assembly stubs

		p := s.Prog(obj.ACALL)
		p.To.Type = obj.TYPE_MEM
		p.To.Name = obj.NAME_EXTERN
		p.To.Sym = ssagen.BoundsCheckFunc[v.AuxInt]
		s.UseArgs(16) // space used in callee args area by assembly stubs
	case ssa.OpS390XFLOGR, ssa.OpS390XPOPCNT,
		ssa.OpS390XNEG, ssa.OpS390XNEGW,
		ssa.OpS390XMOVWBR, ssa.OpS390XMOVDBR:
		p := s.Prog(v.Op.Asm())

		p := s.Prog(obj.ACALL)
		p.To.Type = obj.TYPE_MEM
		p.To.Name = obj.NAME_EXTERN
		p.To.Sym = ssagen.BoundsCheckFunc[v.AuxInt]
		s.UseArgs(16) // space used in callee args area by assembly stubs

	case ssa.OpPPC64LoweredNilCheck:
		if buildcfg.GOOS == "aix" {
			// CMP Rarg0, $0
			// BNE 2(PC)
			// STW R0, 0(R0)

		}
	}

	if s.maxarg < v.AuxInt {
		s.maxarg = v.AuxInt
	}
}

// UseArgs records the fact that an instruction needs a certain amount of
// callee args space for its use.
func (s *State) UseArgs(n int64) {
	if s.maxarg < n {
		s.maxarg = n
	}
}

// fieldIdx finds the index of the field referred to by the ODOT node n.