RFC: std.json sucessor

[via Digitalmars-d]

On Tuesday, 26 August 2014 at 13:24:11 UTC, Don wrote:
> No, it's more subtle. On the original x87, signalling NaNs are 
> triggered for 64 bits loads, but not for 80 bit loads. You have 
> to read the fine print to discover this.

You are right, but it happens for loads from the FP-stack too: 
«Source operand is an SNaN. Does not occur if the source operand 
is in double extended-precision floating-point format (FLD m80fp 
or FLD ST(i)).»

> I don't think the behaviour was intentional.

It seems reasonable, you need to load/save NaNs without 
exceptions if you do a context switch? I don't think the extended 
format was not meant for "end users".

Anyway, the x87 FP stack is history, even MOVSS is considered 
legacy by Intel…