52-actual bits, but there is also an impled bit in for an effective mantissa of 53-bits.

The tricky bit[sic] is that in the 64-bit mantissa of the 80-bit animal, there is not an implied bit.

Examine what is said, not who speaks -- Silence betokens consent -- Love the truth but pardon error.
Lingua non convalesco, consenesco et abolesco. -- Rule 1 has a caveat! -- Who broke the cabal?
"Science is about questioning the status quo. Questioning authority".
In the absence of evidence, opinion is indistinguishable from prejudice.

In reply to Re^7: Unpacking extended-double precision floats by BrowserUk
in thread Unpacking extended-double precision floats by herveus

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