// We are already on m's g0 stack.

	// Go relies on R0 being $0.
	XOR	R0, R0

	// TODO(jsing): Save callee-save registers (R14-R31, F14-F31, V20-V31).

	MOVD    m_g0(R3), g
	BL	runtime·save_g(SB)

	BL	runtime·mstart(SB)

	// TODO(jsing): Restore callee-save registers (R14-R31, F14-F31, V20-V31).

	// Go is all done with this OS thread.
	// Tell pthread everything is ok (we never join with this thread, so

	// should never return
	JAL	runtime·abort(SB)
	UNDEF

/*
 * support for morestack
 */

// Called during function prolog when more stack is needed.
// Caller has already loaded:
// loong64: R31: LR
//
// The traceback routines see morestack on a g0 as being
// the top of a stack (for example, morestack calling newstack
// calling the scheduler calling newm calling gc), so we must

	VMOVH	-70(R12), W3   // 7bdd60e1
	VMOVW	(R3), W31      // 78001fe2
	VMOVW	64(R20), W16   // 7810a422
	VMOVW	-104(R17), W24 // 7be68e22
	VMOVD	(R3), W2       // 780018a3
	VMOVD	128(R23), W19  // 7810bce3
	VMOVD	-256(R31), W0  // 7be0f823

	VMOVB	W8, (R0)       // 78000224
	VMOVB	W0, 511(R3)    // 79ff1824
	VMOVB	W21, -512(R12) // 7a006564
	VMOVH	W12, (R24)     // 7800c325
	VMOVH	W8, 110(R19)   // 78379a25

	// If no traceback support function, which means that
	// runtime/cgo was not linked in, do usual sigtramp.
	MOVD	_cgo_callers(SB), R6
	CMP	$0, R6
	BEQ	sigtramp

	// Inspect the g in TLS without clobbering R30/R31 via runtime.load_g.
	MOVD	runtime·tls_g(SB), R9
	MOVD	0(R9), R9

	// Figure out if we are currently in a cgo call.
	// If not, just do usual sigtramp.
	// compared to ARM64 and others.
	CMP	$0, R9

	VEXTRACTHM V1, R2                       // 10490e42
	VEXTRACTQM V1, R2                       // 104c0e42
	VEXTRACTWM V1, R6                       // 10ca0e42
	VEXTSD2Q V1, V2                         // 105b0e02
	VGNB V1, $1, R31                        // 13e10ccc
	VINSBLX R1, R2, V3                      // 1061120f
	VINSBRX R1, R2, V3                      // 1061130f
	VINSBVLX R1, V1, V2                     // 1041080f

        }

        checkIdeaProject(ideaModel, originalIdeaModel)
    }

    // This test mostly reproduces `org.gradle.plugins.ide.tooling.r31.PersistentCompositeDependencySubstitutionCrossVersionSpec.ensures unique name for all Idea modules in composite`
    def "ensures unique name for all Idea modules in composite"() {
        singleProjectBuildInRootDir("buildA") {

	"R14",
	"R15",
	"R16",
	"R17",
	"R18",
	"R19",
	"R20",
	"R21",
	"g", // aka R22
	"R23",
	"R24",
	"R25",
	"R26",
	"R27",
	"R28",
	"R29",
	// R30 is REGTMP not used in regalloc
	"R31",

	"F0",
	"F1",
	"F2",
	"F3",
	"F4",
	"F5",
	"F6",
	"F7",
	"F8",
	"F9",
	"F10",
	"F11",
	"F12",
	"F13",
	"F14",
	"F15",
	"F16",
	"F17",
	"F18",
	"F19",

 * powerpc 64
 */
const (
	NSNAME = 8
	NSYM   = 50
	NREG   = 32 /* number of general registers */
	NFREG  = 32 /* number of floating point registers */
)

const (
	/* RBasePPC64 = 4096 */
	/* R0=4096 ... R31=4127 */
	REG_R0 = obj.RBasePPC64 + iota
	REG_R1
	REG_R2
	REG_R3
	REG_R4
	REG_R5
	REG_R6
	REG_R7
	REG_R8
	REG_R9
	REG_R10
	REG_R11
	REG_R12
	REG_R13
	REG_R14
	REG_R15
	REG_R16

	REGMAX = REG_R25

	REGCTXT = REG_R26 // environment for closures
	REGTMP  = REG_R27 // reserved for liblink
	REGG    = REG_R28 // G
	REGFP   = REG_R29 // frame pointer
	REGLINK = REG_R30

	// ARM64 uses R31 as both stack pointer and zero register,
	// depending on the instruction. To differentiate RSP from ZR,
	// we use a different numeric value for REGZERO and REGSP.
	REGZERO = REG_R31
	REGSP   = REG_RSP

	// q1: BNE	R20, done
	p = obj.Appendp(p, c.newprog)
	q1 := p

	p.As = ABNE
	p.From.Type = obj.TYPE_REG
	p.From.Reg = REG_R20
	p.To.Type = obj.TYPE_BRANCH
	p.Mark |= BRANCH

	// MOV	LINK, R31
	p = obj.Appendp(p, c.newprog)

	p.As = mov
	p.From.Type = obj.TYPE_REG
	p.From.Reg = REGLINK
	p.To.Type = obj.TYPE_REG
	p.To.Reg = REG_R31
	if q != nil {
		q.To.SetTarget(p)
		p.Mark |= LABEL