| 1 | // ====-- ashldi3.c - Implement __ashldi3 ---------------------------------===// |
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| 2 | // |
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| 3 | // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions. |
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| 4 | // See https://llvm.org/LICENSE.txt for license information. |
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| 5 | // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception |
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| 6 | // |
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| 7 | //===----------------------------------------------------------------------===// |
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| 8 | // |
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| 9 | // This file implements __ashldi3 for the compiler_rt library. |
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| 10 | // |
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| 11 | //===----------------------------------------------------------------------===// |
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| 12 | |
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| 13 | #include "int_lib.h" |
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| 14 | |
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| 15 | // Returns: a << b |
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| 16 | |
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| 17 | // Precondition: 0 <= b < bits_in_dword |
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| 18 | |
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| 19 | COMPILER_RT_ABI di_int __ashldi3(di_int a, int b) { |
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| 20 | const int bits_in_word = (int)(sizeof(si_int) * CHAR_BIT); |
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| 21 | dwords input; |
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| 22 | dwords result; |
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| 23 | input.all = a; |
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| 24 | if (b & bits_in_word) /* bits_in_word <= b < bits_in_dword */ { |
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| 25 | result.s.low = 0; |
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| 26 | result.s.high = input.s.low << (b - bits_in_word); |
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| 27 | } else /* 0 <= b < bits_in_word */ { |
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| 28 | if (b == 0) |
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| 29 | return a; |
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| 30 | result.s.low = input.s.low << b; |
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| 31 | result.s.high = |
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| 32 | ((su_int)input.s.high << b) | (input.s.low >> (bits_in_word - b)); |
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| 33 | } |
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| 34 | return result.all; |
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| 35 | } |
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| 36 | |
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| 37 | #if defined(__ARM_EABI__) |
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| 38 | COMPILER_RT_ALIAS(__ashldi3, __aeabi_llsl) |
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| 39 | #endif |
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| 40 | |
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