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(fleven? ix)   -- what's ix?  I infer a flonum with integer value, but

you didn't use the same parameter name in flodd?.

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For fldenormalized,

issubnormal is not in C99.   Looks like it was put in to C11.

Presumably, this expression will suffice where issubnormal is not available?

(fpclassify(x) == FP_SUBNORMAL)

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In the spec for fl+* you refer to fl-fast-fl+*

..but in the spec for the constant, you spell it "fl-fast-+*"

Also, the users of this SRFI would be better able to make use of fl-fast-+*

if it were known at compile-time.    Would it make more sense to

suggest this symbol be in (features) when relevant?

That would be a non-portable aspect to the SRFI, but it's already

the case that any practical implementation of this SRFI will

require non-portable efforts (and the absence of the flag

in (features) still a portable condition).

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The constant fl-2/pi, you describe as bound to 2 ** fl-pi, but

I'm sure you meant 2 / fl-pi.

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Bound to the largest/smallest finite flonum. (C99 DBL_MAX and its negation)

The "smallest finite flonum" is not what most people would

consider equivalent to the negation of DBL_MAX.

Presumably you meant "...the greatest/least finite flonum...", 

consistent with the variable names.    

Perhaps even clearer, "...the largest positive/negative finite flonums..."

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In the definitions for fl-integer-exponent-zero and

fl-integer-exponent-nan, you refer to flinteger-binary-log which

doesn't exist anymore and can just be deleted.  The refs to FP_ILOGB0 and

FP_ILOGBNAN are fine.

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sign-bit -- did you intend to add this function without an fl-prefix?

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The description of fllog10 is lacking a closing parenthesis.

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