panic("decompressor already registered")
	}
}

// RegisterCompressor registers custom compressors for a specified method ID.
// The common methods [Store] and [Deflate] are built in.
func RegisterCompressor(method uint16, comp Compressor) {
	if _, dup := compressors.LoadOrStore(method, comp); dup {
		panic("compressor already registered")
	}
}

func compressor(method uint16) Compressor {

var amd64BadOperandTests = []badOperandTest{
	{"[", "register list: expected ']', found EOF"},
	{"[4", "register list: bad low register in `[4`"},
	{"[]", "register list: bad low register in `[]`"},
	{"[f-x]", "register list: bad low register in `[f`"},
	{"[r10-r13]", "register list: bad low register in `[r10`"},
	{"[k3-k6]", "register list: bad low register in `[k3`"},
	{"[X0]", "register list: expected '-' after `[X0`, found ']'"},

Some symbols, such as <code>R1</code> or <code>LR</code>,
are predefined and refer to registers.
The exact set depends on the architecture.
</p>

<p>
There are four predeclared symbols that refer to pseudo-registers.
These are not real registers, but rather virtual registers maintained by
the toolchain, such as a frame pointer.
The set of pseudo-registers is the same for all architectures:
</p>

<ul>

<li>

	MOV	$0, 0(SP)			// ERROR "constant load must target register"
	MOV	$0, 8(SP)			// ERROR "constant load must target register"
	MOV	$1234, 0(SP)			// ERROR "constant load must target register"
	MOV	$1234, 8(SP)			// ERROR "constant load must target register"
	MOVB	$1, X5				// ERROR "unsupported constant load"
	MOVH	$1, X5				// ERROR "unsupported constant load"
	MOVW	$1, X5				// ERROR "unsupported constant load"

	FMOVS	0x44332211(R1), F2	// FMOVS	1144201745(R1), F2
	FMOVD	0x1000000(R1), F2	// FMOVD	16777216(R1), F2
	FMOVD	0x44332211(R1), F2	// FMOVD	1144201745(R1), F2

// shifted or extended register offset.
	MOVD	(R2)(R6.SXTW), R4               // 44c866f8
	MOVD	(R3)(R6), R5                    // 656866f8
	MOVD	(R3)(R6*1), R5                  // 656866f8
	MOVD	(R2)(R6), R4                    // 446866f8

//			($1 << 20) |		/* MCR/MRC */
//			(($2^C_SCOND_XOR) << 28) |		/* scond */
//			(($3 & 15) << 8) |	/* coprocessor number */
//			(($5 & 7) << 21) |	/* coprocessor operation */
//			(($7 & 15) << 12) |	/* arm register */
//			(($9 & 15) << 16) |	/* Crn */
//			(($11 & 15) << 0) |	/* Crm */
//			(($12 & 7) << 5) |	/* coprocessor information */
//			(1<<4));			/* must be set */
//		outcode(AMRC, Always, &nullgen, 0, &g);
//	}

			// If the struct has 3 fields tv_sec, tv_usec, _pad1, then we
			// still want to remove the tv_ prefix.
			// The check for "orig_" here handles orig_eax in the
			// x86 ptrace register sets, which otherwise have all fields
			// with reg_ prefixes.
			if strings.HasPrefix(n.Name, "orig_") || strings.HasPrefix(n.Name, "_") {
				continue
			}
			i := strings.Index(n.Name, "_")
			if i < 0 {

			if !filepath.IsLocal(f.Name) || strings.Contains(f.Name, `\`) {
				zipinsecurepath.IncNonDefault()
				return ErrInsecurePath
			}
		}
	}
	return nil
}

// RegisterDecompressor registers or overrides a custom decompressor for a
// specific method ID. If a decompressor for a given method is not found,
// [Reader] will default to looking up the decompressor at the package level.

	VPGATHERQQ Y2, (BP)(X2*2), Y2   // ERROR "mask, index, and destination registers should be distinct"
	VPGATHERQQ Y2, (BP)(X2*2), Y7   // ERROR "mask, index, and destination registers should be distinct"
	VPGATHERQQ Y2, (BP)(X7*2), Y2   // ERROR "mask, index, and destination registers should be distinct"
	VPGATHERQQ Y7, (BP)(X2*2), Y2   // ERROR "mask, index, and destination registers should be distinct"

			p.errorf("register list: bad low register in `[%s`", loName)
		}
		return
	}
	if tok := p.next().ScanToken; tok != '-' {
		p.errorf("register list: expected '-' after `[%s`, found %s", loName, tok)
		return
	}
	hiName := p.next().String()
	hi, ok := p.arch.Register[hiName]
	if !ok {
		p.errorf("register list: bad high register in `[%s-%s`", loName, hiName)
		return
	}