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375ecf678c
Update the vendored TomsFastMath (TFM) library to v0.13.1. Resolves: https://bugzilla.clamav.net/show_bug.cgi?id=11992 I removed compatibility macro's from when libTomMath was used. This required removing a bunch of faux-error handling because the fast-math equivalent functions return void, and cannot fail. The previous version used had named the header "bignum_fast.h" instead of "tfm.h" and had customizations in that header to enable TFM_CHECK all the time, and also TFM_NO_ASM if __GNUC__ not defined or if the system isn't 64bit architecture. This update uses tfm.h as-is, and has CMake define TFM_CHECK and TFM_NO_ASM as needed. I've kept bignum.h as an interface to including tfm.h so that in the future we can more easily add support for system-installed TomsFastMath instead of the vendored one, taking inspiration from Debian's patch to support system-TomsFastMath. See: https://salsa.debian.org/clamav-team/clamav/-/blob/unstable/debian/patches/add-support-for-system-tomsfastmath.patch
55 lines
1.1 KiB
C
55 lines
1.1 KiB
C
/* TomsFastMath, a fast ISO C bignum library.
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*
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* This project is meant to fill in where LibTomMath
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* falls short. That is speed ;-)
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*
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* This project is public domain and free for all purposes.
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*
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* Tom St Denis, tomstdenis@gmail.com
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*/
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#include <tfm_private.h>
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/* c = (a, b) */
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void fp_gcd(fp_int *a, fp_int *b, fp_int *c)
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{
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fp_int u, v, r;
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/* either zero than gcd is the largest */
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if (fp_iszero (a) == 1 && fp_iszero (b) == 0) {
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fp_abs (b, c);
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return;
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}
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if (fp_iszero (a) == 0 && fp_iszero (b) == 1) {
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fp_abs (a, c);
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return;
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}
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/* optimized. At this point if a == 0 then
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* b must equal zero too
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*/
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if (fp_iszero (a) == 1) {
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fp_zero(c);
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return;
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}
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/* sort inputs */
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if (fp_cmp_mag(a, b) != FP_LT) {
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fp_init_copy(&u, a);
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fp_init_copy(&v, b);
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} else {
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fp_init_copy(&u, b);
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fp_init_copy(&v, a);
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}
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fp_zero(&r);
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while (fp_iszero(&v) == FP_NO) {
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fp_mod(&u, &v, &r);
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fp_copy(&v, &u);
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fp_copy(&r, &v);
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}
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fp_copy(&u, c);
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}
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/* $Source$ */
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/* $Revision$ */
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/* $Date$ */
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