[dmd-internals] Regarding deprecation of volatile statements
walter at digitalmars.com
Wed Aug 1 11:00:25 PDT 2012
On 8/1/2012 10:20 AM, Alex Rønne Petersen wrote:
> First, the value of c.i is read and saved into a compiler-generated temporary.
> Then, d.i is set to this temporary. Then the temporary is incremented and
> stored into c.i. I can only guess, but is the problem you're trying to point
> out that there might be multiple reads from c.i depending on the compiler
> implementation? If so, I already mentioned that this is insignificant:
> Excessive reads have no impact on semantics, but writes do.
I've seen memory mapped I/O where the read cycles *were* important (they were
And yes, i++ can be (and sometimes is) done with multiple reads.
> Which is how almost all compiler IRs do it. You'll rarely find compiler IRs
that don't use explicit load and store instructions.
See dmd :-)
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