114 lines
2.4 KiB
C
114 lines
2.4 KiB
C
/* Shift functions for the GCC support library for the Renesas RL78 processors.
|
||
Copyright (C) 2011 Free Software Foundation, Inc.
|
||
Contributed by Red Hat.
|
||
|
||
This file is part of GCC.
|
||
|
||
GCC 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; either version 3, or (at your option)
|
||
any later version.
|
||
|
||
GCC 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.
|
||
|
||
Under Section 7 of GPL version 3, you are granted additional
|
||
permissions described in the GCC Runtime Library Exception, version
|
||
3.1, as published by the Free Software Foundation.
|
||
|
||
You should have received a copy of the GNU General Public License and
|
||
a copy of the GCC Runtime Library Exception along with this program;
|
||
see the files COPYING3 and COPYING.RUNTIME respectively. If not, see
|
||
<http://www.gnu.org/licenses/>. */
|
||
|
||
typedef int sint32_type __attribute__ ((mode (SI)));
|
||
typedef unsigned int uint32_type __attribute__ ((mode (SI)));
|
||
typedef int sint16_type __attribute__ ((mode (HI)));
|
||
typedef unsigned int uint16_type __attribute__ ((mode (HI)));
|
||
|
||
uint32_type __ashlsi3 (uint32_type in, char bit);
|
||
sint32_type __ashrsi3 (sint32_type in, char bit);
|
||
int __clrsbhi2 (sint16_type x);
|
||
extern int __clrsbsi2 (sint32_type x);
|
||
|
||
typedef struct
|
||
{
|
||
union
|
||
{
|
||
uint32_type u;
|
||
uint16_type h[2];
|
||
} u;
|
||
} dd;
|
||
|
||
uint32_type
|
||
__ashlsi3 (uint32_type in, char bit)
|
||
{
|
||
uint16_type h, l;
|
||
dd d;
|
||
|
||
if (bit > 32)
|
||
return 0;
|
||
if (bit < 0)
|
||
return in;
|
||
|
||
d.u.u = in;
|
||
h = d.u.h[1];
|
||
l = d.u.h[0];
|
||
|
||
if (bit > 15)
|
||
{
|
||
h = l;
|
||
l = 0;
|
||
bit -= 16;
|
||
}
|
||
|
||
while (bit)
|
||
{
|
||
h = (h << 1) | (l >> 15);
|
||
l <<= 1;
|
||
bit --;
|
||
}
|
||
|
||
d.u.h[1] = h;
|
||
d.u.h[0] = l;
|
||
return d.u.u;
|
||
}
|
||
|
||
sint32_type
|
||
__ashrsi3 (sint32_type in, char bit)
|
||
{
|
||
sint16_type h;
|
||
uint16_type l;
|
||
dd d;
|
||
|
||
if (bit > 32)
|
||
return 0;
|
||
if (bit < 0)
|
||
return in;
|
||
|
||
d.u.u = in;
|
||
h = d.u.h[1];
|
||
l = d.u.h[0];
|
||
|
||
while (bit)
|
||
{
|
||
l = (h << 15) | (l >> 1);
|
||
h >>= 1;
|
||
bit --;
|
||
}
|
||
|
||
d.u.h[1] = h;
|
||
d.u.h[0] = l;
|
||
return d.u.u;
|
||
}
|
||
|
||
int
|
||
__clrsbhi2 (sint16_type x)
|
||
{
|
||
if (x == 0)
|
||
return 15;
|
||
return __clrsbsi2 ((sint32_type) x) - 16;
|
||
}
|