var xcmp [C_NCLASS][C_NCLASS]bool

func span0(ctxt *obj.Link, cursym *obj.LSym, newprog obj.ProgAlloc) {
	if ctxt.Retpoline {
		ctxt.Diag("-spectre=ret not supported on loong64")
		ctxt.Retpoline = false // don't keep printing
	}

	p := cursym.Func().Text
	if p == nil || p.Link == nil { // handle external functions and ELF section symbols
		return
	}

	}

	if strings.HasPrefix(name, "goexperiment.") {
		return slices.Contains(build.Default.ToolTags, name)
	}

	if name == "cgo" && ctxt.cgoEnabled {
		return true
	}

	if name == ctxt.GOOS || name == ctxt.GOARCH || name == "gc" {
		return true
	}

	if ctxt.noOptEnv && name == "gcflags_noopt" {
		return true
	}

	if name == "test_run" {
		return true
	}

	return false
}

		// We don't have a cgo unwinder (typical case), or we do but we're not
		// in a cgo frame or we're out of cgo context.
		return 0
	}

	ctxt := u.g.ptr().cgoCtxt[u.cgoCtxt]
	u.cgoCtxt--
	cgoContextPCs(ctxt, pcBuf)
	for i, pc := range pcBuf {
		if pc == 0 {
			return i
		}
	}
	return len(pcBuf)
}

	MOVQ	BX, g(CX)
	MOVQ	(g_sched+gobuf_sp)(BX), SP
	MOVQ	(g_sched+gobuf_bp)(BX), BP
	CALL	runtime·newstack(SB)
	CALL	runtime·abort(SB)	// crash if newstack returns
	RET

// morestack but not preserving ctxt.
TEXT runtime·morestack_noctxt(SB),NOSPLIT,$0
	MOVL	$0, DX
	JMP	runtime·morestack(SB)

// spillArgs stores return values from registers to a *internal/abi.RegArgs in R12.
TEXT ·spillArgs(SB),NOSPLIT,$0-0

	}

	// Scan the saved context register. This is effectively a live
	// register that gets moved back and forth between the
	// register and sched.ctxt without a write barrier.
	if gp.sched.ctxt != nil {
		scanblock(uintptr(unsafe.Pointer(&gp.sched.ctxt)), goarch.PtrSize, &oneptrmask[0], gcw, &state)
	}

	// Scan the stack. Accumulate a list of stack objects.
	var u unwinder
	for u.init(gp, 0); u.valid(); u.next() {

			// we've seen so far. A new best spill candidate.
			r = t
			maxuse = n
		}
	}
	if maxuse == -1 {
		s.f.Fatalf("couldn't find register to spill")
	}

	if s.f.Config.ctxt.Arch.Arch == sys.ArchWasm {
		// TODO(neelance): In theory this should never happen, because all wasm registers are equal.

	case ssa.OpPPC64LoweredGetCallerSP:
		// caller's SP is FixedFrameSize below the address of the first arg
		p := s.Prog(ppc64.AMOVD)
		p.From.Type = obj.TYPE_ADDR
		p.From.Offset = -base.Ctxt.Arch.FixedFrameSize
		p.From.Name = obj.NAME_PARAM
		p.To.Type = obj.TYPE_REG
		p.To.Reg = v.Reg()

	case ssa.OpPPC64LoweredGetCallerPC:
		p := s.Prog(obj.AGETCALLERPC)
		p.To.Type = obj.TYPE_REG

(MOVWload [off] {sym} (SB) _) && symIsRO(sym) => (MOVLconst [int32(read16(sym, int64(off), config.ctxt.Arch.ByteOrder))])
(MOVLload [off] {sym} (SB) _) && symIsRO(sym) => (MOVQconst [int64(read32(sym, int64(off), config.ctxt.Arch.ByteOrder))])
(MOVQload [off] {sym} (SB) _) && symIsRO(sym) => (MOVQconst [int64(read64(sym, int64(off), config.ctxt.Arch.ByteOrder))])

		fmt.Fprintf(fm, "void crosscall2(void(*fn)(void*) __attribute__((unused)), void *a __attribute__((unused)), int c __attribute__((unused)), size_t ctxt __attribute__((unused))) { }\n")
		fmt.Fprintf(fm, "size_t _cgo_wait_runtime_init_done(void) { return 0; }\n")
		fmt.Fprintf(fm, "void _cgo_release_context(size_t ctxt __attribute__((unused))) { }\n")
		fmt.Fprintf(fm, "char* _cgo_topofstack(void) { return (char*)0; }\n")
	} else {

	fn := sym.(*AuxCall).Fn
	return fn != nil && fn.String() == name
}

// canLoadUnaligned reports if the architecture supports unaligned load operations.
func canLoadUnaligned(c *Config) bool {
	return c.ctxt.Arch.Alignment == 1
}

// nlzX returns the number of leading zeros.
func nlz64(x int64) int { return bits.LeadingZeros64(uint64(x)) }
func nlz32(x int32) int { return bits.LeadingZeros32(uint32(x)) }