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Diffstat (limited to 'libgcc/config/lm32/_mulsi3.c')
-rw-r--r-- | libgcc/config/lm32/_mulsi3.c | 48 |
1 files changed, 48 insertions, 0 deletions
diff --git a/libgcc/config/lm32/_mulsi3.c b/libgcc/config/lm32/_mulsi3.c new file mode 100644 index 0000000000..c5a5a16a3d --- /dev/null +++ b/libgcc/config/lm32/_mulsi3.c @@ -0,0 +1,48 @@ +/* _mulsi3 for Lattice Mico32. + Contributed by Jon Beniston <jon@beniston.com> + + Copyright (C) 2009-2017 Free Software Foundation, Inc. + + This file is free software; you can redistribute it and/or modify it + under the terms of the GNU General Public License as published by the + Free Software Foundation; either version 3, or (at your option) any + later version. + + This file is distributed in the hope that it will be useful, but + WITHOUT ANY WARRANTY; without even the implied warranty of + MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU + General Public License for more details. + + Under Section 7 of GPL version 3, you are granted additional + permissions described in the GCC Runtime Library Exception, version + 3.1, as published by the Free Software Foundation. + + You should have received a copy of the GNU General Public License and + a copy of the GCC Runtime Library Exception along with this program; + see the files COPYING3 and COPYING.RUNTIME respectively. If not, see + <http://www.gnu.org/licenses/>. */ + +#include "libgcc_lm32.h" + +/* Integer multiplication. */ + +USItype +__mulsi3 (USItype a, USItype b) +{ + USItype result; + + result = 0; + + if (a == 0) + return 0; + + while (b != 0) + { + if (b & 1) + result += a; + a <<= 1; + b >>= 1; + } + + return result; +} |