// BFX/BFXU/BFC/BFI
	BFX	$16, $8, R1, R2 // BFX $16, R1, $8, R2   // 5124afe7
	BFX	$29, $2, R8                              // 5881bce7
	BFXU	$16, $8, R1, R2 // BFXU $16, R1, $8, R2  // 5124efe7
	BFXU	$29, $2, R8                              // 5881fce7
	BFC	$29, $2, R8                              // 1f81dee7
	BFI	$29, $2, R8                              // 1881dee7
	BFI	$16, $8, R1, R2 // BFI $16, R1, $8, R2   // 1124d7e7

		// Test the cutover to bytealg.Index when it is triggered in
		// the middle of rune that contains consecutive runs of equal bytes.
		{"aaaaaKKKK\U000bc104", '\U000bc104', 17}, // cutover: (n + 16) / 8
		{"aaaaaKKKK鄄", '鄄', 17},
		{"aaKKKKKa\U000bc104", '\U000bc104', 18}, // cutover: 4 + n>>4
		{"aaKKKKKa鄄", '鄄', 18},
	}
	for _, tt := range tests {
		if got := IndexRune([]byte(tt.in), tt.rune); got != tt.want {