// On x86, the ABI is to save the frame pointer word at the
	// top of the stack frame, so we have to back down over it.
	// On arm64, the frame pointer should be at the bottom of
	// the stack (with R29 (aka FP) = RSP), in which case we would
	// not want to do the subtraction here. But we started out without
	// any frame pointer, and when we wanted to add it, we didn't

	"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",
	"F13",