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sim: bfin: fix M_IH saturation size

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This reverts the previous commit and does it right.  This change got
lost in the shuffle of patches I have pending.

Basically the logic is to change the 32bit saturation (and then masked
to 16bits) to a proper 16bit saturation.

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 20:10:57 +00:00
parent 388aa9fe20
commit a0a71a7f8b
2 changed files with 6 additions and 17 deletions
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10
sim/bfin/ChangeLog
View File

@ -1,3 +1,8 @@
2011-06-18 Robin Getz <robin.getz@analog.com>
* bfin-sim.c (extract_mult): Call saturate_s16 directly when
mmod is M_IH rather than computing the result by hand.
2011-06-18 Robin Getz <robin.getz@analog.com>
* bfin-sim.c (decode_macfunc): Add nosat_acc to track acc value
@ -21,11 +26,6 @@
(decode_macfunc): Likewise. Drop sign extension of unsigned
values.
2011-06-18 Robin Getz <robin.getz@analog.com>
* bfin-sim.c (extract_mult): When mmod is M_IH, change the order
from round/saturate to saturate/round/saturate.
2011-06-18 Robin Getz <robin.getz@analog.com>
* bfin-sim.c (saturate_s40_astat): Change ">=" to ">".

13
sim/bfin/bfin-sim.c
View File

@ -1534,19 +1534,8 @@ extract_mult (SIM_CPU *cpu, bu64 res, int mmod, int MM,
{
case 0:
case M_W32:
return saturate_s16 (rnd16 (res), overflow);
case M_IH:
{
bu32 sgn = !!(res >> 39);
bu16 val = rnd16 (saturate_s32 (res, overflow));
bu32 sgn0 = (val >> 15) & 1;
if (sgn == sgn0 || !val)
return val;
if (sgn)
return 0x8000;
*overflow = 1;
return 0x7FFF;
}
return saturate_s16 (rnd16 (res), overflow);
case M_IS:
return saturate_s16 (res, overflow);
case M_FU: