Update of /cvsroot/tcl/tcl/generic
In directory ddv4jf1.ch3.sourceforge.com:/tmp/cvs-serv17658/generic
Modified Files:
Tag: core-8-5-branch
tcl.h
Log Message:
* generic/tcl.h: Changed the typedef for the mp_digit type
from:
typedef unsigned long mp_digit;
to:
typedef unsigned int mp_digit;
For 32-bit builds where "long" and "int" are two names for the same
thing, this is no change at all. For 64-bit builds, though, this
causes the dp[] array of an mp_int to be made up of 32-bit elements
instead of 64-bit elements. This is a huge improvement because details
elsewhere in the mp_int implementation cause only 28 bits of each
element to be actually used storing number data. Without this change
bignums are over 50% wasted space on 64-bit systems. [Bug 2800740].
***POTENTIAL INCOMPATIBILITY***
For 64-bit builds, callers of routines with (mp_digit) or (mp_digit *)
arguments *will*, and callers of routines with (mp_int *) arguments
*may* suffer both binary and stubs incompatibilities with Tcl releases
8.5.0 - 8.5.7. Such possibilities should be checked, and if such
incompatibilities are present, suitable [package require] requirements
on the Tcl release should be put in place to keep such built code
[load]-ing only in Tcl interps that are compatible.
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