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sim: bfin: fix accumulator edge case saturation

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When the accumulator saturates, it needs to be greater than, but not
equal to, the largest unsigned value as this is what the hardware does.

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 17:27:01 +00:00
parent 886ea33b69
commit 73aae8efb2
2 changed files with 7 additions and 2 deletions
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5
sim/bfin/ChangeLog
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@ -1,3 +1,8 @@
2011-06-18 Robin Getz <robin.getz@analog.com>
* bfin-sim.c (saturate_s40_astat): Change ">" to ">=".
(decode_macfunc): Likewise when mmod is M_IH.
2011-06-18 Mike Frysinger <vapier@gentoo.org>
* interp.c (sim_create_inferior): Change free to freeargv.

4
sim/bfin/bfin-sim.c
View file

@ -1398,7 +1398,7 @@ saturate_s40_astat (bu64 val, bu32 *v)
*v = 1;
return -((bs64)1 << 39);
}
else if ((bs64)val >= ((bs64)1 << 39) - 1)
else if ((bs64)val > ((bs64)1 << 39) - 1)
{
*v = 1;
return ((bu64)1 << 39) - 1;
@ -1645,7 +1645,7 @@ decode_macfunc (SIM_CPU *cpu, int which, int op, int h0, int h1, int src0,
case M_IH:
if ((bs64)acc < -0x80000000ll)
acc = -0x80000000ull, sat = 1;
else if ((bs64)acc >= 0x7fffffffll)
else if ((bs64)acc > 0x7fffffffll)
acc = 0x7fffffffull, sat = 1;
break;
case M_W32: