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/* ====-- ashldi3.c - Implement __ashldi3 -----------------------------------===
*
* The LLVM Compiler Infrastructure
*
* This file is dual licensed under the MIT and the University of Illinois Open
* Source Licenses. See LICENSE.TXT for details.
*
* ===----------------------------------------------------------------------===
*
* This file implements __ashldi3 for the compiler_rt library.
*
* ===----------------------------------------------------------------------===
*/
#include "int_lib.h"
/* Returns: a << b */
/* Precondition: 0 <= b < bits_in_dword */
di_int
__ashldi3(di_int a, si_int b)
{
const int bits_in_word = (int)(sizeof(si_int) * CHAR_BIT);
dwords input;
dwords result;
input.all = a;
if (b & bits_in_word) /* bits_in_word <= b < bits_in_dword */
{
result.s.low = 0;
result.s.high = input.s.low << (b - bits_in_word);
}
else /* 0 <= b < bits_in_word */
{
if (b == 0)
return a;
result.s.low = input.s.low << b;
result.s.high = (input.s.high << b) | (input.s.low >> (bits_in_word - b));
}
return result.all;
}
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