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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
42 lines
861 B
C
42 lines
861 B
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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/* unsigned addition */
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void s_fp_add(fp_int *a, fp_int *b, fp_int *c)
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{
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int x, y, oldused;
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register fp_word t;
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y = MAX(a->used, b->used);
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oldused = MIN(c->used, FP_SIZE);
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c->used = y;
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t = 0;
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for (x = 0; x < y; x++) {
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t += ((fp_word)a->dp[x]) + ((fp_word)b->dp[x]);
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c->dp[x] = (fp_digit)t;
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t >>= DIGIT_BIT;
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}
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if (t != 0 && x < FP_SIZE) {
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c->dp[c->used++] = (fp_digit)t;
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++x;
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}
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c->used = x;
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for (; x < oldused; x++) {
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c->dp[x] = 0;
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}
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fp_clamp(c);
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}
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/* $Source$ */
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/* $Revision$ */
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/* $Date$ */
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