(5) FCCMPD, FCCMPS, FCCMPED, FCCMPES <cond>, Fm. Fn, $<nzcv>

Examples:

	FCCMPD AL, F8, F26, $0     <=>    fccmp d26, d8, #0x0, al
	FCCMPS VS, F29, F4, $4     <=>    fccmp s4, s29, #0x4, vs
	FCCMPED LE, F20, F5, $13   <=>    fccmpe d5, d20, #0xd, le
	FCCMPES NE, F26, F10, $0   <=>    fccmpe s10, s26, #0x0, ne

(6) CCMN, CCMNW, CCMP, CCMPW <cond>, <Rn>, $<imm>, $<nzcv>

Examples:

			i--
			continue // R18 is not used, skip
		}
		reg := fmt.Sprintf("(R%d, R%d)", i, i+1)
		l.add2("STP", "LDP", reg, 16)
	}
	// Add flag registers.
	l.addSpecial(
		"MOVD NZCV, R0\nMOVD R0, %d(RSP)",
		"MOVD %d(RSP), R0\nMOVD R0, NZCV",
		8)
	l.addSpecial(
		"MOVD FPSR, R0\nMOVD R0, %d(RSP)",
		"MOVD %d(RSP), R0\nMOVD R0, FPSR",
		8)
	// TODO: FPCR? I don't think we'll change it, so no need to save.

		cond := SpecialOperand(p.From.Offset)
		if cond < SPOP_EQ || cond > SPOP_NV {
			c.ctxt.Diag("invalid condition\n%v", p)
		} else {
			cond -= SPOP_EQ
		}

		nzcv := int(p.To.Offset)
		if nzcv&^0xF != 0 {
			c.ctxt.Diag("implausible condition\n%v", p)
		}
		rf := int(p.Reg)
		if p.GetFrom3() == nil || p.GetFrom3().Reg < REG_F0 || p.GetFrom3().Reg > REG_F31 {

	MRS	MVFR0_EL1, R29                     // 1d0338d5
	MRS	MVFR1_EL1, R7                      // 270338d5
	MRS	MVFR2_EL1, R19                     // 530338d5
	MRS	NZCV, R11                          // 0b423bd5
	MSR	R10, NZCV                          // 0a421bd5
	MRS	OSDLR_EL1, R16                     // 901330d5
	MSR	R21, OSDLR_EL1                     // 951310d5
	MRS	OSDTRRX_EL1, R5                    // 450030d5