MOVD g_m(g), R1
	// R2 = g0
	MOVD m_g0(R1), R2

	// save state in g->sched
	MOVD 0(SP), g_sched+gobuf_pc(g)     // caller's PC
	MOVD $fn+0(FP), g_sched+gobuf_sp(g) // caller's SP

	// if g == g0 call badmcall
	Get g
	Get R2
	I64Eq
	If
		JMP runtime·badmcall(SB)
	End

	// switch to g0's stack
	I64Load (g_sched+gobuf_sp)(R2)
	I64Const $8
	I64Sub
	I32WrapI64
	Set SP

	// set arg to current g

}

var x86OperandTests = []operandTest{
	{"$(2.928932188134524e-01)", "$(0.29289321881345243)"},
	{"$-1", "$-1"},
	{"$0", "$0"},
	{"$0x00000000", "$0"},
	{"$runtime·badmcall(SB)", "$runtime.badmcall(SB)"},
	{"$setg_gcc<>(SB)", "$setg_gcc<>(SB)"},
	{"$~15", "$-16"},
	{"(-64*1024+104)(SP)", "-65432(SP)"},
	{"(0*4)(BP)", "(BP)"},
	{"(1*4)(DI)", "4(DI)"},
	{"(4*4)(BP)", "16(BP)"},
	{"(AX)", "(AX)"},

	LEAL	fn+0(FP), BX	// caller's SP
	MOVL	BX, (g_sched+gobuf_sp)(AX)

	// switch to m->g0 & its stack, call fn
	MOVL	g(DX), BX
	MOVL	g_m(BX), BX
	MOVL	m_g0(BX), SI
	CMPL	SI, AX	// if g == m->g0 call badmcall
	JNE	3(PC)
	MOVL	$runtime·badmcall(SB), AX
	JMP	AX
	MOVL	SI, g(DX)	// g = m->g0
	MOVL	(g_sched+gobuf_sp)(SI), SP	// sp = m->g0->sched.sp
	PUSHL	AX
	MOVL	DI, DX
	MOVL	0(DI), DI
	CALL	DI
	POPL	AX