[#FeeFrac-DivFallback]
= xref:FeeFrac.adoc[FeeFrac]::DivFallback
:relfileprefix: ../
:mrdocs:

Helper function for 96/32 signed division, rounding towards negative infinity (if round_down) or positive infinity (if !round_down). This is a fallback version, separate so that it can be tested on platforms where it isn't actually needed.

== Synopsis

Declared in `<util/feefrac.h>`

[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
static
int64_t
DivFallback(
    std::pair<int64_t, uint32_t> n,
    int32_t d,
    bool round_down) noexcept;
----

== Description

The exact behavior with negative n does not really matter, but this implementation chooses to be consistent for testability reasons.

The result must fit in an int64_t, and d must be strictly positive.

== Return Value

The quotient, rounded as requested.

== Parameters

[cols="1,4"]
|===
| Name| Description
| *n*
| The 96‐bit signed dividend, encoded as a (high, low) pair.
| *d*
| The strictly positive 32‐bit divisor.
| *round_down*
| Whether to round towards negative infinity (true) or positive infinity (false).
|===


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