lib1Project.application.sourceCompatibility = SwiftVersion.SWIFT4

        project.evaluate()

        expect:
        def generateManifest = project.tasks['generateSwiftPmManifest']
        def pkg = generateManifest.package.get()
        pkg.swiftLanguageVersion == SwiftVersion.SWIFT4
    }

    def "does not include a swift language version if not explicitly declared"() {

      sqrt0 = sqrtApproxWithDoubles(x);
    } else {
      int shift = (log2 - DoubleUtils.SIGNIFICAND_BITS) & ~1; // even!
      /*
       * We have that x / 2^shift < 2^54. Our initial approximation to sqrtFloor(x) will be
       * 2^(shift/2) * sqrtApproxWithDoubles(x / 2^shift).
       */
      sqrt0 = sqrtApproxWithDoubles(x.shiftRight(shift)).shiftLeft(shift >> 1);
    }

                if (project.hasProperty("swift4")) {
                    sourceCompatibility = SwiftVersion.SWIFT4
                } else {
                    sourceCompatibility = SwiftVersion.SWIFT3
                }
            }
         """

        outputs.snapshot { succeeds("compileDebugSwift") }

        expect:
        // rebuild for Swift4
        succeeds("compileDebugSwift", "-Pswift4")

	if mant == 0 {
		exp = 0
	}

	// Shift digits so leading 1 (if any) is at bit 1<<60.
	mant <<= 60 - flt.mantbits
	for mant != 0 && mant&(1<<60) == 0 {
		mant <<= 1
		exp--
	}

	// Round if requested.
	if prec >= 0 && prec < 15 {
		shift := uint(prec * 4)
		extra := (mant << shift) & (1<<60 - 1)
		mant >>= 60 - shift
		if extra|(mant&1) > 1<<59 {
			mant++
		}

(SRLI <t> [x] (MOVWUreg y)) && x >= 0 && x <= 31 => (SRLIW <t> [int64(x)] y)

// Replace right shifts that exceed size of signed type.
(SRAI <t> [x] (MOVBreg y)) && x >=  8 => (SRAI  [63] (SLLI <t> [56] y))
(SRAI <t> [x] (MOVHreg y)) && x >= 16 => (SRAI  [63] (SLLI <t> [48] y))
(SRAI <t> [x] (MOVWreg y)) && x >= 32 => (SRAIW [31] y)

// Eliminate right shifts that exceed size of unsigned type.
(SRLI <t> [x] (MOVBUreg y)) && x >=  8 => (MOVDconst <t> [0])

	}

	// Bits 0:51 (bytes 0:8, bits 0:64, shift 0, mask 51).
	v.l0 = byteorder.LeUint64(x[0:8])
	v.l0 &= maskLow51Bits
	// Bits 51:102 (bytes 6:14, bits 48:112, shift 3, mask 51).
	v.l1 = byteorder.LeUint64(x[6:14]) >> 3
	v.l1 &= maskLow51Bits
	// Bits 102:153 (bytes 12:20, bits 96:160, shift 6, mask 51).
	v.l2 = byteorder.LeUint64(x[12:20]) >> 6
	v.l2 &= maskLow51Bits

	}
}

type ImmShift struct {
	imm   uint16
	shift uint8
}

func (ImmShift) isArg() {}

func (is ImmShift) String() string {
	if is.shift == 0 {
		return fmt.Sprintf("#%#x", is.imm)
	}
	if is.shift < 128 {
		return fmt.Sprintf("#%#x, LSL #%d", is.imm, is.shift)
	}
	return fmt.Sprintf("#%#x, MSL #%d", is.imm, is.shift-128)
}

type ExtShift uint8

const (

	for p > 0 {
		if p <= k {
			// Shift p 0s down into the top of each run of 1s.
			c &= c >> (p & 63)
			break
		}
		// Shift k 0s down into the top of each run of 1s.
		c &= c >> (k & 63)
		if c == 0 {
			return 64
		}
		p -= k
		// We've just doubled the minimum length of 0-runs.
		// This allows us to shift farther in the next iteration.
		k *= 2
	}

func (w WaitStatus) Killed() bool { return w&mask == killed && syscall.Signal(w>>shift) != SIGKILL }

func (w WaitStatus) Continued() bool { return w&mask == stopped && syscall.Signal(w>>shift) == SIGSTOP }

func (w WaitStatus) StopSignal() syscall.Signal {
	if !w.Stopped() {
		return -1
	}
	return syscall.Signal(w>>shift) & 0xFF
}

		// shifts
		{name: "SLLV", argLength: 2, reg: gp21, asm: "SLLV"},                      // arg0 << arg1, shift amount is mod 64
		{name: "SLLVconst", argLength: 1, reg: gp11, asm: "SLLV", aux: "Int64"},   // arg0 << auxInt
		{name: "SRLV", argLength: 2, reg: gp21, asm: "SRLV"},                      // arg0 >> arg1, unsigned, shift amount is mod 64