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sim: bfin: tweak saturation handling with TFU/FU modes and MM bit 

This too should have been squashed into an earlier change.  It covers
a few more cases in the V/VS saturation patch when working with TFU
and FU modes of dsp insns.

Signed-off-by: Robin Getz <robin.getz@analog.com>
Signed-off-by: Mike Frysinger <vapier@gentoo.org>
This commit is contained in:
Mike Frysinger 2011-06-18 21:22:50 +00:00
parent 90e13d65c1
commit a56a195412
2 changed files with 35 additions and 14 deletions
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5
sim/bfin/ChangeLog
View File

@ -1,3 +1,8 @@
2011-06-18 Robin Getz <robin.getz@analog.com>
* bfin-sim.c (decode_macfunc): Handle MM when mmod is M_TFU.
Check MM once when mmod is M_FU to match M_TFU better.
2011-06-18 Robin Getz <robin.getz@analog.com>
* bfin-sim.c (decode_dsp32shiftimm_0): When shift is greater than

44
sim/bfin/bfin-sim.c
View File

@ -1617,10 +1617,20 @@ decode_macfunc (SIM_CPU *cpu, int which, int op, int h0, int h1, int src0,
acc = 0x7fffffffffull, sat = 1;
break;
case M_TFU:
if (!MM && (bs64)acc < 0)
acc = 0, sat = 1;
if (!MM && (bs64)acc > 0xFFFFFFFFFFull)
acc = 0xFFFFFFFFFFull, sat = 1;
if (MM)
{
if ((bs64)acc < -((bs64)1 << 39))
acc = -((bu64)1 << 39), sat = 1;
if ((bs64)acc > 0x7FFFFFFFFFll)
acc = 0x7FFFFFFFFFull, sat = 1;
}
else
{
if ((bs64)acc < 0)
acc = 0, sat = 1;
if ((bs64)acc > 0xFFFFFFFFFFull)
acc = 0xFFFFFFFFFFull, sat = 1;
}
break;
case M_IU:
if (!MM && acc & 0x8000000000000000ull)
@ -1633,16 +1643,22 @@ decode_macfunc (SIM_CPU *cpu, int which, int op, int h0, int h1, int src0,
acc |= 0xffffff0000000000ull;
break;
case M_FU:
if (!MM && (bs64)acc < 0)
acc = 0x0, sat = 1;
if (MM && (bs64)acc < -((bs64)1 << 39))
acc = -((bu64)1 << 39), sat = 1;
if (!MM && (bs64)acc > (bs64)0xFFFFFFFFFFll)
acc = 0xFFFFFFFFFFull, sat = 1;
if (MM && acc > 0xFFFFFFFFFFull)
acc &= 0xFFFFFFFFFFull;
if (MM && acc & 0x8000000000ull)
acc |= 0xffffff0000000000ull;
if (MM)
{
if ((bs64)acc < -((bs64)1 << 39))
acc = -((bu64)1 << 39), sat = 1;
if ((bs64)acc > 0x7FFFFFFFFFll)
acc = 0x7FFFFFFFFFull, sat = 1;
else if (acc & 0x8000000000ull)
acc |= 0xffffff0000000000ull;
}
else
{
if ((bs64)acc < 0)
acc = 0x0, sat = 1;
else if ((bs64)acc > (bs64)0xFFFFFFFFFFll)
acc = 0xFFFFFFFFFFull, sat = 1;
}
break;
case M_IH:
if ((bs64)acc < -0x80000000ll)