"R11", // REGCTXT for closures
	"R12",
	"R13", // REGTLS
	"R14",
	"R15",
	"R16",
	"R17",
	"R18",
	"R19",
	"R20",
	"R21",
	"R22",
	"R23",
	"R24",
	"R25",
	"R26",
	"R27",
	"R28",
	"R29",
	"g",   // REGG.  Using name "g" and setting Config.hasGReg makes it "just happen".
	"R31", // REGTMP

	"F0",
	"F1",
	"F2",
	"F3",
	"F4",
	"F5",
	"F6",
	"F7",
	"F8",
	"F9",

	"R14",
	"R15",
	"R16",
	"R17",
	"R18",
	"R19",
	"R20",
	"R21",
	"R22",
	// R23 = REGTMP not used in regalloc
	"R24",
	"R25",
	// R26 reserved by kernel
	// R27 reserved by kernel
	// R28 = REGSB not used in regalloc
	"SP",  // aka R29
	"g",   // aka R30
	"R31", // aka REGLINK

	"F0",
	"F1",
	"F2",
	"F3",
	"F4",
	"F5",
	"F6",
	"F7",
	"F8",
	"F9",
	"F10",
	"F11",

	// R20 already saved
	// R21 already saved.
	MOVV	R22, 160(R29)
	// R23 is tmp register.
	MOVV	R24, 168(R29)
	MOVV	R25, 176(R29)
	// R26 is reserved by kernel.
	// R27 is reserved by kernel.
	// R28 is REGSB (not modified by Go code).
	// R29 is SP.
	// R30 is g.
	// R31 is LR, which was saved by the prologue.

	CALL	runtime·wbBufFlush(SB)

	MOVV	8(R29), R20
	MOVV	16(R29), R21
	MOVV	24(R29), R3

	BL	(R0)
droppedm:

	// Done!
	RET

// Called from cgo wrappers, this function returns g->m->curg.stack.hi.
// Must obey the gcc calling convention.
TEXT _cgo_topofstack(SB),NOSPLIT,$24
	// g (R28) and REGTMP (R27)  might be clobbered by load_g. They
	// are callee-save in the gcc calling convention, so save them.
	MOVD	R27, savedR27-8(SP)
	MOVD	g, saveG-16(SP)

	BL	runtime·load_g(SB)
	MOVD	g_m(g), R0

<h3 id="arm64">ARM64</h3>

<p>
<code>R18</code> is the "platform register", reserved on the Apple platform.
To prevent accidental misuse, the register is named <code>R18_PLATFORM</code>.
<code>R27</code> and <code>R28</code> are reserved by the compiler and linker.
<code>R29</code> is the frame pointer.
<code>R30</code> is the link register.
</p>

<p>
Instruction modifiers are appended to the instruction following a period.

	"R14",
	"R15",
	"R16",
	"R17",
	"R18", // platform register, not used
	"R19",
	"R20",
	"R21",
	"R22",
	"R23",
	"R24",
	"R25",
	"R26",
	// R27 = REGTMP not used in regalloc
	"g",   // aka R28
	"R29", // frame pointer, not used
	"R30", // aka REGLINK
	"SP",  // aka R31

	"F0",
	"F1",
	"F2",
	"F3",
	"F4",
	"F5",
	"F6",
	"F7",
	"F8",
	"F9",
	"F10",
	"F11",
	"F12",