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Diffstat (limited to 'src/arch/mips/ashldi3.c')
| -rw-r--r-- | src/arch/mips/ashldi3.c | 60 |
1 files changed, 60 insertions, 0 deletions
diff --git a/src/arch/mips/ashldi3.c b/src/arch/mips/ashldi3.c new file mode 100644 index 0000000000..caa69fa3e1 --- /dev/null +++ b/src/arch/mips/ashldi3.c @@ -0,0 +1,60 @@ +/* + * This file is part of the coreboot project. + * + * Copyright (C) 2014 Google, Inc. + * + * Based on linux arch/mips/lib/ashldi3.c + * + * This program 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; version 2 of the License. + * + * This program 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. + * + * You should have received a copy of the GNU General Public License + * along with this program; if not, write to the Free Software + * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA + */ + +#ifndef __ORDER_LITTLE_ENDIAN__ +#errror "What endian are you!?" +#endif + +typedef unsigned word_type; +long long __ashldi3(long long u, word_type b); + +struct DWstruct { + int low, high; +}; +typedef union { + struct DWstruct s; + long long ll; +} DWunion; + +long long __ashldi3(long long u, word_type b) +{ + DWunion uu, w; + word_type bm; + + if (b == 0) + return u; + + uu.ll = u; + bm = 32 - b; + + if (bm <= 0) { + w.s.low = 0; + w.s.high = (unsigned int) uu.s.low << -bm; + } else { + const unsigned int carries = (unsigned int) uu.s.low >> bm; + + w.s.low = (unsigned int) uu.s.low << b; + w.s.high = ((unsigned int) uu.s.high << b) | carries; + } + + return w.ll; +} + |