The iPhones had GPUs too. As far as I'm aware, the GPU design in the M-series chips are directly descended from the iPhone GPU in the exact same way the CPU is.

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chocochunks 12 hours ago | parent [-]

Prior to the A11 chip they used PowerVR designed GPUs. They weren't done in house.

	▲	rangestransform 11 hours ago \| parent \| next [-]
		Based on Alyssa Rosenzweig’s reverse engineering, the current GPUs are still descended from PowerVR IP
	▲	eigenspace 12 hours ago \| parent \| prev [-]
		Ah I see, good to know.