MOVW    -2(SP), AX
	ANDW    $0xf3ff, AX
	ORW     $0x0800, AX  // Rounding Control set to +Inf
	MOVW    AX, -4(SP)   // store new Control Word
	FLDCW   -4(SP)       // load new Control Word
	FRNDINT              // F0=Ceil(x)
	FLDCW   -2(SP)       // load old Control Word
	FMOVDP  F0, ret+8(FP)
	RET

// func archFloor(x float64) float64
TEXT ·archFloor(SB),NOSPLIT,$0
	FMOVD   x+0(FP), F0  // F0=x

			args = nil
			op = "int3"
		}

	case LCALL, LJMP:
		if len(args) == 2 {
			args[0], args[1] = args[1], args[0]
		}

	case FCHS, FABS, FTST, FLDPI, FLDL2E, FLDLG2, F2XM1, FXAM, FLD1, FLDL2T, FSQRT, FRNDINT, FCOS, FSIN:
		if len(args) == 0 {
			args = append(args, "st0")
		}

	case FPTAN, FSINCOS, FUCOMPP, FCOMPP, FYL2X, FPATAN, FXTRACT, FPREM1, FPREM, FYL2XP1, FSCALE:
		if len(args) == 0 {

	"FMOVVP",
	"FMOVW",
	"FMOVWP",
	"FMOVX",
	"FMOVXP",
	"FMULD",
	"FMULDP",
	"FMULF",
	"FMULL",
	"FMULW",
	"FNOP",
	"FPATAN",
	"FPREM",
	"FPREM1",
	"FPTAN",
	"FRNDINT",
	"FRSTOR",
	"FSAVE",
	"FSCALE",
	"FSIN",
	"FSINCOS",
	"FSQRT",
	"FSTCW",
	"FSTENV",
	"FSTSW",
	"FSUBD",
	"FSUBDP",
	"FSUBF",
	"FSUBL",
	"FSUBRD",
	"FSUBRDP",

	FNSTENV:         "FNSTENV",
	FNSTSW:          "FNSTSW",
	FPATAN:          "FPATAN",
	FPREM:           "FPREM",
	FPREM1:          "FPREM1",
	FPTAN:           "FPTAN",
	FRNDINT:         "FRNDINT",
	FRSTOR:          "FRSTOR",
	FSCALE:          "FSCALE",
	FSIN:            "FSIN",
	FSINCOS:         "FSINCOS",
	FSQRT:           "FSQRT",
	FST:             "FST",
	FSTP:            "FSTP",

	FPATAN                                  // d9f3
	FPREM                                   // d9f8
	FPREM1                                  // d9f5
	FPTAN                                   // d9f2
	FRNDINT                                 // d9fc
	//TODO: FRSTORL (BX)                    // dd23
	//TODO: FRSTORL (R11)                   // 41dd23
	FSCALE                                  // d9fd