blob: a35351c634f8fe5805d95812199af5e4c76809d4 [file] [log] [blame]
/* Shift functions for the GCC support library for the MSP430
Copyright (C) 2011-2022 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, signed char);
sint32_type __ashrsi3 (sint32_type, signed char);
int __clrsbhi2 (sint16_type);
extern int __clrsbsi2 (sint32_type);
typedef struct
{
union
{
uint32_type u;
uint16_type h[2];
} u;
} dd;
uint32_type
__ashlsi3 (uint32_type in, signed 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, signed 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;
}