145 lines
2.8 KiB
C
145 lines
2.8 KiB
C
/* Copyright (c) 2017 SiFive Inc. All rights reserved.
|
|
|
|
This copyrighted material is made available to anyone wishing to use,
|
|
modify, copy, or redistribute it subject to the terms and conditions
|
|
of the FreeBSD License. This program is distributed in the hope that
|
|
it will be useful, but WITHOUT ANY WARRANTY expressed or implied,
|
|
including the implied warranties of MERCHANTABILITY or FITNESS FOR
|
|
A PARTICULAR PURPOSE. A copy of this license is available at
|
|
http://www.opensource.org/licenses.
|
|
*/
|
|
|
|
#include <ieeefp.h>
|
|
|
|
#if defined(__riscv_flen) || defined (__riscv_zfinx)
|
|
static void
|
|
fssr(unsigned value)
|
|
{
|
|
asm volatile ("fscsr %0" :: "r"(value));
|
|
}
|
|
|
|
static unsigned
|
|
frsr()
|
|
{
|
|
unsigned value;
|
|
asm volatile ("frcsr %0" : "=r" (value));
|
|
return value;
|
|
}
|
|
|
|
static fp_rnd
|
|
frm_fp_rnd (unsigned frm)
|
|
{
|
|
switch (frm)
|
|
{
|
|
case 0: return FP_RN;
|
|
case 1: return FP_RZ;
|
|
case 2: return FP_RM;
|
|
case 3: return FP_RP;
|
|
/* 4 ~ 7 is invalid value, so just retun FP_RP. */
|
|
default:return FP_RP;
|
|
}
|
|
}
|
|
|
|
static fp_except
|
|
frm_fp_except (unsigned except)
|
|
{
|
|
fp_except fp = 0;
|
|
if (except & (1 << 0))
|
|
fp |= FP_X_IMP;
|
|
if (except & (1 << 1))
|
|
fp |= FP_X_UFL;
|
|
if (except & (1 << 2))
|
|
fp |= FP_X_OFL;
|
|
if (except & (1 << 3))
|
|
fp |= FP_X_DX;
|
|
if (except & (1 << 4))
|
|
fp |= FP_X_INV;
|
|
return fp;
|
|
}
|
|
|
|
static unsigned
|
|
frm_except(fp_except fp)
|
|
{
|
|
unsigned except = 0;
|
|
if (fp & FP_X_IMP)
|
|
except |= (1 << 0);
|
|
if (fp & FP_X_UFL)
|
|
except |= (1 << 1);
|
|
if (fp & FP_X_OFL)
|
|
except |= (1 << 2);
|
|
if (fp & FP_X_DX)
|
|
except |= (1 << 3);
|
|
if (fp & FP_X_INV)
|
|
except |= (1 << 4);
|
|
return except;
|
|
}
|
|
|
|
#endif /* __riscv_flen */
|
|
|
|
fp_except
|
|
fpgetmask(void)
|
|
{
|
|
return 0;
|
|
}
|
|
|
|
fp_rnd
|
|
fpgetround(void)
|
|
{
|
|
#if defined(__riscv_flen) || defined (__riscv_zfinx)
|
|
unsigned rm = (frsr () >> 5) & 0x7;
|
|
return frm_fp_rnd (rm);
|
|
#else
|
|
return FP_RZ;
|
|
#endif /* __riscv_flen */
|
|
}
|
|
|
|
fp_except
|
|
fpgetsticky(void)
|
|
{
|
|
#if defined(__riscv_flen) || defined (__riscv_zfinx)
|
|
return frm_fp_except(frsr ());
|
|
#else
|
|
return 0;
|
|
#endif /* __riscv_flen */
|
|
}
|
|
|
|
fp_except
|
|
fpsetmask(fp_except mask)
|
|
{
|
|
return -1;
|
|
}
|
|
|
|
fp_rnd
|
|
fpsetround(fp_rnd rnd_dir)
|
|
{
|
|
#if defined(__riscv_flen) || defined (__riscv_zfinx)
|
|
unsigned fsr = frsr ();
|
|
unsigned rm = (fsr >> 5) & 0x7;
|
|
unsigned new_rm;
|
|
switch (rnd_dir)
|
|
{
|
|
case FP_RN: new_rm = 0; break;
|
|
case FP_RZ: new_rm = 1; break;
|
|
case FP_RM: new_rm = 2; break;
|
|
case FP_RP: new_rm = 3; break;
|
|
default: return -1;
|
|
}
|
|
fssr (new_rm << 5 | fsr & 0x1f);
|
|
return frm_fp_rnd (rm);
|
|
#else
|
|
return -1;
|
|
#endif /* __riscv_flen */
|
|
}
|
|
|
|
fp_except
|
|
fpsetsticky(fp_except sticky)
|
|
{
|
|
#if defined(__riscv_flen) || defined (__riscv_zfinx)
|
|
unsigned fsr = frsr ();
|
|
fssr (frm_except(sticky) | (fsr & ~0x1f));
|
|
return frm_fp_except(fsr);
|
|
#else
|
|
return -1;
|
|
#endif /* __riscv_flen */
|
|
}
|