forked from OSchip/llvm-project
46 lines
1.3 KiB
C
46 lines
1.3 KiB
C
/* ====-- 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 */
|
|
|
|
COMPILER_RT_ABI 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;
|
|
}
|
|
|
|
#if defined(__ARM_EABI__)
|
|
AEABI_RTABI di_int __aeabi_llsl(di_int a, si_int b) COMPILER_RT_ALIAS(__ashldi3);
|
|
#endif
|