[cfe-dev] [RFC] C++17 hardware constructive / destructive interference size

[Friedman, Eli via cfe-dev]

On 5/25/2018 11:29 AM, JF Bastien via cfe-dev wrote:
>
>  1. Teach the target infrastructure that hardware interference size is
>     something they can specify (in tablegen files somewhere).
>  2. Allow overriding the value in sub-targets using -march or -mcpu
>     (the sub-target defines the numeric value, and the user gets the
>     overriden one by using -march or -mcpu).
>

We can't change the value based on -mcpu.  We generally allow mixing 
code built with different values of -mcpu.  And any code which is linked 
together must use the same value for 
hardware_destructive_interference_size, or else we violate ODR.

-Eli

-- 
Employee of Qualcomm Innovation Center, Inc.
Qualcomm Innovation Center, Inc. is a member of Code Aurora Forum, a Linux Foundation Collaborative Project

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