s := strings.Split(tname, "_")
	// A valid call will split like {"", "savegpr0", "20"}
	if len(s) != 3 {
		return 0, false // Not an abi func.
	}
	minReg := 14 // _savegpr0_{n}, _savegpr1_{n}, _savefpr_{n}, 14 <= n <= 31
	offMul := 4  // 1 instruction per register op.
	switch s[1] {
	case "savegpr0", "savegpr1", "savefpr":
	case "restgpr0", "restgpr1", "restfpr":
	case "savevr", "restvr":

// subset of these.
//
// These macros assume a 16 byte aligned stack pointer. This
// is required by ELFv1, ELFv2, and AIX PPC64.

#define SAVE_GPR_SIZE (18*8)
#define SAVE_GPR(offset)               \
	MOVD	R14, (offset+8*0)(R1)  \
	MOVD	R15, (offset+8*1)(R1)  \
	MOVD	R16, (offset+8*2)(R1)  \
	MOVD	R17, (offset+8*3)(R1)  \
	MOVD	R18, (offset+8*4)(R1)  \
	MOVD	R19, (offset+8*5)(R1)  \