// conversions
		{name: "MOVBreg", argLength: 1, reg: gp11, asm: "MOVB"},   // move from arg0, sign-extended from byte
		{name: "MOVBUreg", argLength: 1, reg: gp11, asm: "MOVBU"}, // move from arg0, unsign-extended from byte
		{name: "MOVHreg", argLength: 1, reg: gp11, asm: "MOVH"},   // move from arg0, sign-extended from half
		{name: "MOVHUreg", argLength: 1, reg: gp11, asm: "MOVHU"}, // move from arg0, unsign-extended from half

		{name: "I64Extend8S", asm: "I64Extend8S", argLength: 1, reg: gp11, typ: "Int64"},   // sign-extend arg0 from 8 to 64 bit
		{name: "I64Extend16S", asm: "I64Extend16S", argLength: 1, reg: gp11, typ: "Int64"}, // sign-extend arg0 from 16 to 64 bit
		{name: "I64Extend32S", asm: "I64Extend32S", argLength: 1, reg: gp11, typ: "Int64"}, // sign-extend arg0 from 32 to 64 bit

		// unary ops
		{name: "NEGL", argLength: 1, reg: gp11, asm: "NEGL", resultInArg0: true, clobberFlags: true}, // -arg0

		{name: "NOTL", argLength: 1, reg: gp11, asm: "NOTL", resultInArg0: true}, // ^arg0

		{name: "BSFL", argLength: 1, reg: gp11, asm: "BSFL", clobberFlags: true}, // arg0 # of low-order zeroes ; undef if zero

		{name: "RISBGZ", argLength: 1, reg: gp11, asm: "RISBGZ", aux: "S390XRotateParams", clobberFlags: true},                   // rotate then insert selected bits [into zero]

		// unary ops
		{name: "NEG", argLength: 1, reg: gp11, asm: "NEG", clobberFlags: true},   // -arg0
		{name: "NEGW", argLength: 1, reg: gp11, asm: "NEGW", clobberFlags: true}, // -arg0

		{name: "NOT", argLength: 1, reg: gp11, resultInArg0: true, clobberFlags: true},  // ^arg0

		{name: "SHRQconst", argLength: 1, reg: gp11, asm: "SHRQ", aux: "Int8", resultInArg0: true, clobberFlags: true},
		{name: "SHRLconst", argLength: 1, reg: gp11, asm: "SHRL", aux: "Int8", resultInArg0: true, clobberFlags: true},
		{name: "SHRWconst", argLength: 1, reg: gp11, asm: "SHRW", aux: "Int8", resultInArg0: true, clobberFlags: true},
		{name: "SHRBconst", argLength: 1, reg: gp11, asm: "SHRB", aux: "Int8", resultInArg0: true, clobberFlags: true},

// goroutine that is coordinating the goroutine profile (running on its own
// stack), or from the scheduler in preparation to execute gp1 (running on the
// system stack).
func doRecordGoroutineProfile(gp1 *g, pcbuf []uintptr) {
	if readgstatus(gp1) == _Grunning {
		print("doRecordGoroutineProfile gp1=", gp1.goid, "\n")
		throw("cannot read stack of running goroutine")
	}

	offset := int(goroutineProfile.offset.Add(1)) - 1

	si_value  [8]byte
	_reason   [40]byte
}

type gpregs struct {
	gp_ra      uint64
	gp_sp      uint64
	gp_gp      uint64
	gp_tp      uint64
	gp_t       [7]uint64
	gp_s       [12]uint64
	gp_a       [8]uint64
	gp_sepc    uint64
	gp_sstatus uint64
}

type fpregs struct {
	fp_x     [64]uint64 // actually __uint64_t fp_x[32][2]
	fp_fcsr  uint64
	fp_flags int32
	pad      int32
}

		n = max
	}
	if n > int32(len(pp.runq))/2 {
		n = int32(len(pp.runq)) / 2
	}

	sched.runqsize -= n

	gp := sched.runq.pop()
	n--
	for ; n > 0; n-- {
		gp1 := sched.runq.pop()
		runqput(pp, gp1, false)
	}
	return gp
}

// pMask is an atomic bitstring with one bit per P.
type pMask []uint32

// read returns true if P id's bit is set.

33AA          ; mapped                 ; 006B 0070 0061 #1.1  SQUARE KPA
33AB          ; mapped                 ; 006D 0070 0061 #1.1  SQUARE MPA
33AC          ; mapped                 ; 0067 0070 0061 #1.1  SQUARE GPA
33AD          ; mapped                 ; 0072 0061 0064 #1.1  SQUARE RAD
33AE          ; mapped                 ; 0072 0061 0064 2215 0073 #1.1 SQUARE RAD OVER S