Messages in this thread | | | Subject | Re: [PATCH] arm64/io: Don't use WZR in writel | From | Marc Gonzalez <> | Date | Mon, 18 Mar 2019 18:30:26 +0100 |
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On 18/03/2019 18:19, Robin Murphy wrote:
> For the context bank reset, yes, I am assuming that no complier will > ever be perverse enough to detect that cfg is not written after the > NULL check and immediately reallocate it to XZR for no good reason. > I'd like to think that assumption is going to hold for the reasonable > scope of this particular workaround, though.
I'm not sure I understand the above paragraph.
In code such as:
if (val == 0) foo(val);
gcc's algorithm is likely to figure out that the code is equivalent to
if (val == 0) foo(0)
and perform constant-propagation, etc.
Is that what we're talking about?
Regards.
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