VPGATHERQQ X0, 512(SP)(X1*1), X2        // c4e2f991940c00020000
	VPGATHERQQ X0, (R12)(X1*1), X2          // c4c2f991140c
	VPGATHERQQ X0, 16(R12)(X1*1), X2        // c4c2f991540c10
	VPGATHERQQ X0, 512(R12)(X1*1), X2       // c4c2f991940c00020000
	VPGATHERQQ X0, (BP)(X1*1), X2           // c4e2f991540d00
	VPGATHERQQ X0, 16(BP)(X1*1), X2         // c4e2f991540d10
	VPGATHERQQ X0, 512(BP)(X1*1), X2        // c4e2f991940d00020000

	MOVW	$-131072, R2          // c021fffe0000
	MOVH	$-512, R3             // a739fe00
	MOVB	$-1, R4               // a749ffff

	MOVD	$32767, n-8(SP)       // e548f0107fff
	MOVD	$-1, -524288(R1)      // e3a010008071e548a000ffff
	MOVW	$32767, n-8(SP)       // e54cf0107fff
	MOVW	$-32768, 4096(R2)     // e3a020000171e54ca0008000
	MOVH	$512, n-8(SP)         // e544f0100200
	MOVH	$-512, 524288(R3)     // c0a10008000041aa3000e544a000fe00

// MSA VMOVI
	VMOVB	$511, W0   // 7b0ff807
	VMOVH	$24, W23   // 7b20c5c7
	VMOVW	$-24, W15  // 7b5f43c7
	VMOVD	$-511, W31 // 7b700fc7

	VMOVB	(R0), W8       // 78000220
	VMOVB	511(R3), W0    // 79ff1820
	VMOVB	-512(R12), W21 // 7a006560
	VMOVH	(R24), W12     // 7800c321
	VMOVH	110(R19), W8   // 78379a21
	VMOVH	-70(R12), W3   // 7bdd60e1
	VMOVW	(R3), W31      // 78001fe2
	VMOVW	64(R20), W16   // 7810a422

func stack504()  { var buf [504]byte; use(buf[:]); C.callGoStackCheck() }
func stack508()  { var buf [508]byte; use(buf[:]); C.callGoStackCheck() }
func stack512()  { var buf [512]byte; use(buf[:]); C.callGoStackCheck() }
func stack516()  { var buf [516]byte; use(buf[:]); C.callGoStackCheck() }
func stack520()  { var buf [520]byte; use(buf[:]); C.callGoStackCheck() }

		wantMap: sparseDatas{{0, 1}, {2, 1}, {4, 1}, {6, 1}, {8, 1}, {10, 1}},
	}, {
		input: makeInput(FormatGNU, "",
			makeSparseStrings(sparseDatas{{10 << 30, 512}, {20 << 30, 512}})...),
		wantMap: sparseDatas{{10 << 30, 512}, {20 << 30, 512}},
	}}

	for i, v := range vectors {
		var blk block
		var hdr Header
		v.input = v.input[copy(blk[:], v.input):]
		tr := Reader{r: bytes.NewReader(v.input)}

pkg math/bits (darwin-arm64-cgo), const UintSize = 64
pkg os (darwin-arm64), const DevNull = "/dev/null"
pkg os (darwin-arm64), const O_APPEND = 8
pkg os (darwin-arm64), const O_CREATE = 512
pkg os (darwin-arm64), const O_EXCL = 2048
pkg os (darwin-arm64), const O_SYNC = 128
pkg os (darwin-arm64), const O_TRUNC = 1024
pkg os (darwin-arm64), const PathListSeparator = 58

pkg syscall (freebsd-arm64), const BPF_T_MICROTIME_MONOTONIC = 512
pkg syscall (freebsd-arm64), const BPF_T_MICROTIME_MONOTONIC ideal-int
pkg syscall (freebsd-arm64), const BPF_T_MICROTIME_MONOTONIC_FAST = 768
pkg syscall (freebsd-arm64), const BPF_T_MICROTIME_MONOTONIC_FAST ideal-int
pkg syscall (freebsd-arm64), const BPF_T_MONOTONIC = 512
pkg syscall (freebsd-arm64), const BPF_T_MONOTONIC ideal-int

// [Buffer.ReadFrom]. As long as the [Buffer] has at least MinRead bytes beyond
// what is required to hold the contents of r, ReadFrom will not grow the
// underlying buffer.
const MinRead = 512

// ReadFrom reads data from r until EOF and appends it to the buffer, growing
// the buffer as needed. The return value n is the number of bytes read. Any

	magicGNU, versionGNU     = "ustar ", " \x00"
	magicUSTAR, versionUSTAR = "ustar\x00", "00"
	trailerSTAR              = "tar\x00"
)

// Size constants from various tar specifications.
const (
	blockSize  = 512 // Size of each block in a tar stream
	nameSize   = 100 // Max length of the name field in USTAR format
	prefixSize = 155 // Max length of the prefix field in USTAR format

pkg syscall (freebsd-riscv64), const BPF_T_MICROTIME_MONOTONIC = 512 #53466
pkg syscall (freebsd-riscv64), const BPF_T_MICROTIME_MONOTONIC ideal-int #53466
pkg syscall (freebsd-riscv64), const BPF_T_MICROTIME_MONOTONIC_FAST = 768 #53466
pkg syscall (freebsd-riscv64), const BPF_T_MICROTIME_MONOTONIC_FAST ideal-int #53466
pkg syscall (freebsd-riscv64), const BPF_T_MONOTONIC = 512 #53466