0: {"--", -2147483647, "negative"},
		1: {"", maxInt, ""},
		2: {"-", 10, ""},
		3: {"gopher", 0, ""},
		4: {"-", -1, "negative"},
		5: {"--", -102, "negative"},
		6: {string(make([]byte, 255)), int((^uint(0))/255 + 1), "overflow"},
	})

	const is64Bit = 1<<(^uintptr(0)>>63)/2 != 0
	if !is64Bit {
		return
	}

	runTestCases("64-bit", []testCase{
		0: {"-", maxInt, "out of range"},
	})
}

	case AVUZP1:
		return 7<<25 | 3<<11

	case AVUZP2:
		return 7<<25 | 1<<14 | 3<<11

	case AVUADDW, AVUADDW2:
		return 0x17<<25 | 1<<21 | 1<<12

	case AVTRN1:
		return 7<<25 | 5<<11

	case AVTRN2:
		return 7<<25 | 1<<14 | 5<<11
	}

	c.ctxt.Diag("%v: bad rrr %d %v", p, a, a)
	return 0
}

/*
 * imm -> Rd
 * imm op Rn -> Rd
 */

	SYS___CATANHL_B                     = 0x9D4 // 2516
	SYS___CATANHL_H                     = 0x9D5 // 2517
	SYS_CCOS                            = 0x9D6 // 2518
	SYS___CCOS_B                        = 0x9D7 // 2519
	SYS___CCOS_H                        = 0x9D8 // 2520
	SYS_CCOSF                           = 0x9D9 // 2521
	SYS___CCOSF_B                       = 0x9DA // 2522
	SYS___CCOSF_H                       = 0x9DB // 2523

		clobberFlags: true,
		call:         true,
		reg: regInfo{
			clobbers: 65519, // AX CX DX BX BP SI DI X0 X1 X2 X3 X4 X5 X6 X7
		},
	},
	{
		name:         "CALLtail",
		auxType:      auxCallOff,
		argLen:       1,
		clobberFlags: true,
		call:         true,
		tailCall:     true,
		reg: regInfo{
			clobbers: 65519, // AX CX DX BX BP SI DI X0 X1 X2 X3 X4 X5 X6 X7
		},
	},
	{