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fpu_helper.c
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fpu_helper.c
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/*
* OpenRISC float 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"
static inline uint32_t ieee_ex_to_openrisc(OpenRISCCPU *cpu, int fexcp)
{
int ret = 0;
if (fexcp) {
if (fexcp & float_flag_invalid) {
cpu->env.fpcsr |= FPCSR_IVF;
ret = 1;
}
if (fexcp & float_flag_overflow) {
cpu->env.fpcsr |= FPCSR_OVF;
ret = 1;
}
if (fexcp & float_flag_underflow) {
cpu->env.fpcsr |= FPCSR_UNF;
ret = 1;
}
if (fexcp & float_flag_divbyzero) {
cpu->env.fpcsr |= FPCSR_DZF;
ret = 1;
}
if (fexcp & float_flag_inexact) {
cpu->env.fpcsr |= FPCSR_IXF;
ret = 1;
}
}
return ret;
}
static inline void update_fpcsr(OpenRISCCPU *cpu)
{
int tmp = ieee_ex_to_openrisc(cpu,
get_float_exception_flags(&cpu->env.fp_status));
SET_FP_CAUSE(cpu->env.fpcsr, tmp);
if ((GET_FP_ENABLE(cpu->env.fpcsr) & tmp) &&
(cpu->env.fpcsr & FPCSR_FPEE)) {
helper_exception(&cpu->env, EXCP_FPE);
} else {
UPDATE_FP_FLAGS(cpu->env.fpcsr, tmp);
}
}
uint64_t HELPER(itofd)(CPUOpenRISCState *env, uint64_t val)
{
uint64_t itofd;
OpenRISCCPU *cpu = openrisc_env_get_cpu(env);
set_float_exception_flags(0, &cpu->env.fp_status);
itofd = int32_to_float64(val, &cpu->env.fp_status);
update_fpcsr(cpu);
return itofd;
}
uint32_t HELPER(itofs)(CPUOpenRISCState *env, uint32_t val)
{
uint32_t itofs;
OpenRISCCPU *cpu = openrisc_env_get_cpu(env);
set_float_exception_flags(0, &cpu->env.fp_status);
itofs = int32_to_float32(val, &cpu->env.fp_status);
update_fpcsr(cpu);
return itofs;
}
uint64_t HELPER(ftoid)(CPUOpenRISCState *env, uint64_t val)
{
uint64_t ftoid;
OpenRISCCPU *cpu = openrisc_env_get_cpu(env);
set_float_exception_flags(0, &cpu->env.fp_status);
ftoid = float32_to_int64(val, &cpu->env.fp_status);
update_fpcsr(cpu);
return ftoid;
}
uint32_t HELPER(ftois)(CPUOpenRISCState *env, uint32_t val)
{
uint32_t ftois;
OpenRISCCPU *cpu = openrisc_env_get_cpu(env);
set_float_exception_flags(0, &cpu->env.fp_status);
ftois = float32_to_int32(val, &cpu->env.fp_status);
update_fpcsr(cpu);
return ftois;
}
#define FLOAT_OP(name, p) void helper_float_##_##p(void)
#define FLOAT_CALC(name) \
uint64_t helper_float_ ## name ## _d(CPUOpenRISCState *env, \
uint64_t fdt0, uint64_t fdt1) \
{ \
uint64_t result; \
OpenRISCCPU *cpu = openrisc_env_get_cpu(env); \
set_float_exception_flags(0, &cpu->env.fp_status); \
result = float64_ ## name(fdt0, fdt1, &cpu->env.fp_status); \
update_fpcsr(cpu); \
return result; \
} \
\
uint32_t helper_float_ ## name ## _s(CPUOpenRISCState *env, \
uint32_t fdt0, uint32_t fdt1) \
{ \
uint32_t result; \
OpenRISCCPU *cpu = openrisc_env_get_cpu(env); \
set_float_exception_flags(0, &cpu->env.fp_status); \
result = float32_ ## name(fdt0, fdt1, &cpu->env.fp_status); \
update_fpcsr(cpu); \
return result; \
} \
FLOAT_CALC(add)
FLOAT_CALC(sub)
FLOAT_CALC(mul)
FLOAT_CALC(div)
FLOAT_CALC(rem)
#undef FLOAT_CALC
#define FLOAT_TERNOP(name1, name2) \
uint64_t helper_float_ ## name1 ## name2 ## _d(CPUOpenRISCState *env, \
uint64_t fdt0, \
uint64_t fdt1) \
{ \
uint64_t result, temp, hi, lo; \
uint32_t val1, val2; \
OpenRISCCPU *cpu = openrisc_env_get_cpu(env); \
hi = env->fpmaddhi; \
lo = env->fpmaddlo; \
set_float_exception_flags(0, &cpu->env.fp_status); \
result = float64_ ## name1(fdt0, fdt1, &cpu->env.fp_status); \
lo &= 0xffffffff; \
hi &= 0xffffffff; \
temp = (hi << 32) | lo; \
result = float64_ ## name2(result, temp, &cpu->env.fp_status); \
val1 = result >> 32; \
val2 = (uint32_t) (result & 0xffffffff); \
update_fpcsr(cpu); \
cpu->env.fpmaddlo = val2; \
cpu->env.fpmaddhi = val1; \
return 0; \
} \
\
uint32_t helper_float_ ## name1 ## name2 ## _s(CPUOpenRISCState *env, \
uint32_t fdt0, uint32_t fdt1) \
{ \
uint64_t result, temp, hi, lo; \
uint32_t val1, val2; \
OpenRISCCPU *cpu = openrisc_env_get_cpu(env); \
hi = cpu->env.fpmaddhi; \
lo = cpu->env.fpmaddlo; \
set_float_exception_flags(0, &cpu->env.fp_status); \
result = float64_ ## name1(fdt0, fdt1, &cpu->env.fp_status); \
temp = (hi << 32) | lo; \
result = float64_ ## name2(result, temp, &cpu->env.fp_status); \
val1 = result >> 32; \
val2 = (uint32_t) (result & 0xffffffff); \
update_fpcsr(cpu); \
cpu->env.fpmaddlo = val2; \
cpu->env.fpmaddhi = val1; \
return 0; \
}
FLOAT_TERNOP(mul, add)
#undef FLOAT_TERNOP
#define FLOAT_CMP(name) \
uint64_t helper_float_ ## name ## _d(CPUOpenRISCState *env, \
uint64_t fdt0, uint64_t fdt1) \
{ \
int res; \
OpenRISCCPU *cpu = openrisc_env_get_cpu(env); \
set_float_exception_flags(0, &cpu->env.fp_status); \
res = float64_ ## name(fdt0, fdt1, &cpu->env.fp_status); \
update_fpcsr(cpu); \
return res; \
} \
\
uint32_t helper_float_ ## name ## _s(CPUOpenRISCState *env, \
uint32_t fdt0, uint32_t fdt1)\
{ \
int res; \
OpenRISCCPU *cpu = openrisc_env_get_cpu(env); \
set_float_exception_flags(0, &cpu->env.fp_status); \
res = float32_ ## name(fdt0, fdt1, &cpu->env.fp_status); \
update_fpcsr(cpu); \
return res; \
}
FLOAT_CMP(le)
FLOAT_CMP(eq)
FLOAT_CMP(lt)
#undef FLOAT_CMP
#define FLOAT_CMPNE(name) \
uint64_t helper_float_ ## name ## _d(CPUOpenRISCState *env, \
uint64_t fdt0, uint64_t fdt1) \
{ \
int res; \
OpenRISCCPU *cpu = openrisc_env_get_cpu(env); \
set_float_exception_flags(0, &cpu->env.fp_status); \
res = !float64_eq_quiet(fdt0, fdt1, &cpu->env.fp_status); \
update_fpcsr(cpu); \
return res; \
} \
\
uint32_t helper_float_ ## name ## _s(CPUOpenRISCState *env, \
uint32_t fdt0, uint32_t fdt1) \
{ \
int res; \
OpenRISCCPU *cpu = openrisc_env_get_cpu(env); \
set_float_exception_flags(0, &cpu->env.fp_status); \
res = !float32_eq_quiet(fdt0, fdt1, &cpu->env.fp_status); \
update_fpcsr(cpu); \
return res; \
}
FLOAT_CMPNE(ne)
#undef FLOAT_CMPNE
#define FLOAT_CMPGT(name) \
uint64_t helper_float_ ## name ## _d(CPUOpenRISCState *env, \
uint64_t fdt0, uint64_t fdt1) \
{ \
int res; \
OpenRISCCPU *cpu = openrisc_env_get_cpu(env); \
set_float_exception_flags(0, &cpu->env.fp_status); \
res = !float64_le(fdt0, fdt1, &cpu->env.fp_status); \
update_fpcsr(cpu); \
return res; \
} \
\
uint32_t helper_float_ ## name ## _s(CPUOpenRISCState *env, \
uint32_t fdt0, uint32_t fdt1) \
{ \
int res; \
OpenRISCCPU *cpu = openrisc_env_get_cpu(env); \
set_float_exception_flags(0, &cpu->env.fp_status); \
res = !float32_le(fdt0, fdt1, &cpu->env.fp_status); \
update_fpcsr(cpu); \
return res; \
}
FLOAT_CMPGT(gt)
#undef FLOAT_CMPGT
#define FLOAT_CMPGE(name) \
uint64_t helper_float_ ## name ## _d(CPUOpenRISCState *env, \
uint64_t fdt0, uint64_t fdt1) \
{ \
int res; \
OpenRISCCPU *cpu = openrisc_env_get_cpu(env); \
set_float_exception_flags(0, &cpu->env.fp_status); \
res = !float64_lt(fdt0, fdt1, &cpu->env.fp_status); \
update_fpcsr(cpu); \
return res; \
} \
\
uint32_t helper_float_ ## name ## _s(CPUOpenRISCState *env, \
uint32_t fdt0, uint32_t fdt1) \
{ \
int res; \
OpenRISCCPU *cpu = openrisc_env_get_cpu(env); \
set_float_exception_flags(0, &cpu->env.fp_status); \
res = !float32_lt(fdt0, fdt1, &cpu->env.fp_status); \
update_fpcsr(cpu); \
return res; \
}
FLOAT_CMPGE(ge)
#undef FLOAT_CMPGE