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/*
* OpenRISC int helper routines
*
* Copyright (c) 2011-2012 Jia Liu <proljc@gmail.com>
* Feng Gao <gf91597@gmail.com>
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2 of the License, or (at your option) any later version.
*
* This library 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
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, see <http://www.gnu.org/licenses/>.
*/
#include "cpu.h"
#include "helper.h"
#include "exception.h"
#include "host-utils.h"
target_ulong HELPER(ff1)(target_ulong x)
{
/*#ifdef TARGET_OPENRISC64
return x ? ctz64(x) + 1 : 0;
#else*/
return x ? ctz32(x) + 1 : 0;
/*#endif*/
}
target_ulong HELPER(fl1)(target_ulong x)
{
/* not used yet, open it when we need or64. */
/*#ifdef TARGET_OPENRISC64
return 64 - clz64(x);
#else*/
return 32 - clz32(x);
/*#endif*/
}
uint32_t HELPER(mul32)(CPUOpenRISCState *env,
uint32_t ra, uint32_t rb)
{
uint64_t result;
uint32_t high, cy;
OpenRISCCPU *cpu = OPENRISC_CPU(ENV_GET_CPU(env));
result = (uint64_t)ra * rb;
/* regisiers in or32 is 32bit, so 32 is NOT a magic number.
or64 is not handled in this function, and not implement yet,
TARGET_LONG_BITS for or64 is 64, it will break this function,
so, we didn't use TARGET_LONG_BITS here. */
high = result >> 32;
cy = result >> (32 - 1);
if ((cy & 0x1) == 0x0) {
if (high == 0x0) {
return result;
}
}
if ((cy & 0x1) == 0x1) {
if (high == 0xffffffff) {
return result;
}
}
cpu->env.sr |= (SR_OV | SR_CY);
if (cpu->env.sr & SR_OVE) {
raise_exception(cpu, EXCP_RANGE);
}
return result;
}
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