freebsd-skq/contrib/compiler-rt/lib/ashlti3.c
dim 102abf6fd2 Pull in r201909 from upstream compiler-rt trunk (by Joerg Sonnenberger):
Introduce CRT_HAS_128BIT, currently for all __LP64__ platforms.
  Use it to enable the various functions for TI mode.

This makes sure the correct primitives are also built for sparc64.
2014-02-22 00:09:43 +00:00

46 lines
1.2 KiB
C

/* ===-- ashlti3.c - Implement __ashlti3 -----------------------------------===
*
* 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 __ashlti3 for the compiler_rt library.
*
* ===----------------------------------------------------------------------===
*/
#include "int_lib.h"
#ifdef CRT_HAS_128BIT
/* Returns: a << b */
/* Precondition: 0 <= b < bits_in_tword */
ti_int
__ashlti3(ti_int a, si_int b)
{
const int bits_in_dword = (int)(sizeof(di_int) * CHAR_BIT);
twords input;
twords result;
input.all = a;
if (b & bits_in_dword) /* bits_in_dword <= b < bits_in_tword */
{
result.s.low = 0;
result.s.high = input.s.low << (b - bits_in_dword);
}
else /* 0 <= b < bits_in_dword */
{
if (b == 0)
return a;
result.s.low = input.s.low << b;
result.s.high = (input.s.high << b) | (input.s.low >> (bits_in_dword - b));
}
return result.all;
}
#endif /* CRT_HAS_128BIT */