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> On a first order analysis, Qualcomm doesn't want good x64 support, because good x64 support furthers the lifetime of x64, and delays the "transition" to ARM.

The logical thing for Qualcomm in their current market share to do is to implement TSO now, then after they get momentum, create a high-end/low-end tier, and disable TSO for the low-end tier to force vendors to target both ARM/x68.

What Qualcomm is doing now makes them look like they just don't care.

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> create a high-end/low-end tier, and disable TSO for the low-end tier

Wouldn’t that make the low-end tier run faster than the high-end tier, or force them to leave some performance on the table there?

Also, would a per-process flag that controls TSO be possible? Ignoring whether it’s easy to do in the hardware, the only problem I can think of with that is that the OS would have to set that on processes when they start using shared memory, or forbid using shared memory by processes that do not have it set.

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