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extflonum?
extflonum-available?
4.3.5.1 Extflonum Arithmetic
extfl+
extfl-
extfl*
extfl/
extflabs
extfl=
extfl<
extfl>
extfl<=
extfl>=
extflmin
extflmax
extflround
extflfloor
extflceiling
extfltruncate
extflsin
extflcos
extfltan
extflasin
extflacos
extflatan
extfllog
extflexp
extflsqrt
extflexpt
->extfl
extfl->exact-integer
real->extfl
extfl->exact
extfl->fx
fx->extfl
extfl->inexact
4.3.5.2 Extflonum Constants
pi.t
4.3.5.3 Extflonum Vectors
extflvector?
extflvector
make-extflvector
extflvector-length
extflvector-ref
extflvector-set!
extflvector-copy
in-extflvector
for/  extflvector
for*/  extflvector
shared-extflvector
make-shared-extflvector
4.3.5.4 Extflonum Byte Strings
floating-point-bytes->extfl
extfl->floating-point-bytes
4.3.5 Extflonums🔗

 (require racket/extflonum) package: base

An extflonum is an extended-precision (80-bit) floating-point number. Extflonum arithmetic is supported on platforms with extended-precision hardware and where the extflonum implementation does not conflict with normal double-precision arithmetic (i.e., on x86 and x86_64 platforms when Racket is compiled to use SSE instructions for floating-point operations, and on Windows when "longdouble.dll" is available).

A extflonum is not a number in the sense of number?. Only extflonum-specific operations such as extfl+ perform extflonum arithmetic.

A literal extflonum is written like an inexact number, but using an explicit t or T exponent marker (see Reading Extflonums). For example, 3.5t0 is an extflonum. The extflonum values for infinity are +inf.t and -inf.t. The extflonum value for not-a-number is +nan.t or -nan.t.

If (extflonum-available?) produces #f, then all operations exported by racket/extflonum raise exn:fail:unsupported, except for extflonum?, extflonum-available?, and extflvector? (which always work). The reader (see The Reader) always accepts extflonum input; when extflonum operations are not supported, printing an extflonum from the reader uses its source notation (as opposed to normalizing the format).

Two extflonums are equal? if extfl= produces #t for the extflonums. If extflonums are not supported in a platform, extflonums are equal? only if they are eq?.

procedure

(extflonum? v)  boolean?

  v : any/c
Returns #t if v is an extflonum, #f otherwise.

Returns #t if extflonum operations are supported on the current platform, #f otherwise.

4.3.5.1 Extflonum Arithmetic🔗

procedure

(extfl+ a b)  extflonum?

  a : extflonum?
  b : extflonum?

procedure

(extfl- a b)  extflonum?

  a : extflonum?
  b : extflonum?

procedure

(extfl* a b)  extflonum?

  a : extflonum?
  b : extflonum?

procedure

(extfl/ a b)  extflonum?

  a : extflonum?
  b : extflonum?

procedure

(extflabs a)  extflonum?

  a : extflonum?
Like fl+, fl-, fl*, fl/, and flabs, but for extflonums.

procedure

(extfl= a b)  boolean?

  a : extflonum?
  b : extflonum?

procedure

(extfl< a b)  boolean?

  a : extflonum?
  b : extflonum?

procedure

(extfl> a b)  boolean?

  a : extflonum?
  b : extflonum?

procedure

(extfl<= a b)  boolean?

  a : extflonum?
  b : extflonum?

procedure

(extfl>= a b)  boolean?

  a : extflonum?
  b : extflonum?

procedure

(extflmin a b)  extflonum?

  a : extflonum?
  b : extflonum?

procedure

(extflmax a b)  extflonum?

  a : extflonum?
  b : extflonum?
Like fl=, fl<, fl>, fl<=, fl>=, flmin, and flmax, but for extflonums.

procedure

(extflround a)  extflonum?

  a : extflonum?

procedure

(extflfloor a)  extflonum?

  a : extflonum?

procedure

(extflceiling a)  extflonum?

  a : extflonum?

procedure

(extfltruncate a)  extflonum?

  a : extflonum?

procedure

(extflsin a)  extflonum?

  a : extflonum?

procedure

(extflcos a)  extflonum?

  a : extflonum?

procedure

(extfltan a)  extflonum?

  a : extflonum?

procedure

(extflasin a)  extflonum?

  a : extflonum?

procedure

(extflacos a)  extflonum?

  a : extflonum?

procedure

(extflatan a)  extflonum?

  a : extflonum?

procedure

(extfllog a)  extflonum?

  a : extflonum?

procedure

(extflexp a)  extflonum?

  a : extflonum?

procedure

(extflsqrt a)  extflonum?

  a : extflonum?

procedure

(extflexpt a b)  extflonum?

  a : extflonum?
  b : extflonum?

procedure

(->extfl a)  extflonum?

  a : exact-integer?

procedure

(extfl->exact-integer a)  exact-integer?

  a : extflonum?

procedure

(real->extfl a)  extflonum?

  a : real?

procedure

(extfl->exact a)  (and/c real? exact?)

  a : extflonum?

procedure

(extfl->fx a)  fixnum?

  a : extflonum?

procedure

(fx->extfl a)  extflonum?

  a : fixnum?

procedure

(extfl->inexact a)  flonum?

  a : extflonum?
The first six are like ->fl, fl->exact-integer, real->double-flonum, inexact->exact, fl->fx, and fx->fl, but for extflonums. The extfl->inexact function converts a extflonum to its closest flonum approximation.

Changed in version 7.7.0.8 of package base: Changed extfl->fx to truncate.

4.3.5.2 Extflonum Constants🔗

value

pi.t : extflonum?

Like pi, but with 80 bits precision.

4.3.5.3 Extflonum Vectors🔗

An extflvector is like an flvector, but it holds only extflonums. See also Unsafe Extflonum Operations.

Two extflvectors are equal? if they have the same length, and if the values in corresponding slots of the extflvectors are equal?.

procedure

(extflvector? v)  boolean?

  v : any/c

procedure

(extflvector x ...)  extflvector?

  x : extflonum?

procedure

(make-extflvector size [x])  extflvector?

  size : exact-nonnegative-integer?
  x : extflonum? = 0.0t0

procedure

(extflvector-length vec)  exact-nonnegative-integer?

  vec : extflvector?

procedure

(extflvector-ref vec pos)  extflonum?

  vec : extflvector?
  pos : exact-nonnegative-integer?

procedure

(extflvector-set! vec pos x)  extflonum?

  vec : extflvector?
  pos : exact-nonnegative-integer?
  x : extflonum?

procedure

(extflvector-copy vec [start end])  extflvector?

  vec : extflvector?
  start : exact-nonnegative-integer? = 0
  end : exact-nonnegative-integer? = (vector-length v)

procedure

(in-extflvector vec [start stop step])  sequence?

  vec : extflvector?
  start : exact-nonnegative-integer? = 0
  stop : (or/c exact-integer? #f) = #f
  step : (and/c exact-integer? (not/c zero?)) = 1

syntax

(for/extflvector maybe-length (for-clause ...) body ...)

syntax

(for*/extflvector maybe-length (for-clause ...) body ...)

 
maybe-length = 
  | #:length length-expr
  | #:length length-expr #:fill fill-expr
 
  length-expr : exact-nonnegative-integer?
  fill-expr : extflonum?

procedure

(shared-extflvector x ...)  extflvector?

  x : extflonum?

procedure

(make-shared-extflvector size [x])  extflvector?

  size : exact-nonnegative-integer?
  x : extflonum? = 0.0t0

4.3.5.4 Extflonum Byte Strings🔗

procedure

(floating-point-bytes->extfl bstr    
  [big-endian?    
  start    
  end])  extflonum?
  bstr : bytes?
  big-endian? : any/c = (system-big-endian?)
  start : exact-nonnegative-integer? = 0
  end : exact-nonnegative-integer? = (bytes-length bstr)
Like floating-point-bytes->real, but for extflonums: Converts the extended-precision floating-point number encoded in bstr from position start (inclusive) to end (exclusive) to an extflonum. The difference between start an end must be 10 bytes.

procedure

(extfl->floating-point-bytes x    
  [big-endian?    
  dest-bstr    
  start])  bytes?
  x : extflonum?
  big-endian? : any/c = (system-big-endian?)
  dest-bstr : (and/c bytes? (not/c immutable?))
   = (make-bytes 10)
  start : exact-nonnegative-integer? = 0
Like real->floating-point-bytes, but for extflonums: Converts x to its representation in a byte string of length 10.