FAT GMP 5 binaries
14 May 2003 16:49:47 +0200
Karl Hasselstrom <firstname.lastname@example.org> writes:
On 2003-05-14 14:53:44 +0200, Torbjorn Granlund wrote:
> We need to decide what routines to put in __gmp_cpuvec. All GMP
> rouines is one choice. All mpn routines or a subset of mpn rouines
> are other choices.
The routines that have been hand-coded in assembly are obvious
candidates for this. For routines written in C, would the speedup be
worth the effort?
Important routines written in C could call mpn_addmul_1_CPU, directly,
instead of going via __gmp_cpuvec.
> Internal GMP calls would use __gmp_cpuvec[RNUM_GMP_ADDMUL_1] directly,
> via some gmp-impl.h macros. The overhead would be a few cycles.
If a large subset of the GMP functions are cpu-specific, these entry
decisions need not be done very often; code that has been compiled
specifically for processor Foo already knows that it wants the Foo
version of whatever subroutines it calls, so the decision can be done
at compile-time. The decision only has to be done at run-time when a
function _not_ in __gmp_cpuvec calls one that _is_ in there.