darkkirb/old-cross-binutils
1
0
Fork 0
Code Issues Pull requests Projects Releases Packages Wiki Activity

sim: bfin: fix dsp insns IH saturation/rounding behavior

Browse source 
When using the IH modifier, we need to first saturate the value before
rounding it, and then further saturate it a bit more.  This makes the
sim match the hardware behavior with these 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 19:24:57 +00:00
parent b02cc5b9df
commit 075a845a92
2 changed files with 16 additions and 1 deletions
Show stats Download patch file Download diff file Expand all files Collapse all files

5
sim/bfin/ChangeLog
View file

@ -1,3 +1,8 @@
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 ">".

12
sim/bfin/bfin-sim.c
View file

@ -1534,7 +1534,17 @@ extract_mult (SIM_CPU *cpu, bu64 res, int mmod, int MM,
case M_W32:
return saturate_s16 (rnd16 (res), overflow);
case M_IH:
return saturate_s32 (rnd16 (res), overflow) & 0xFFFF;
{
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;
}
case M_IS:
return saturate_s16 (res, overflow);
case M_FU: