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| author | Mike Frysinger <vapier@gentoo.org> | 2011-06-18 19:24:57 +0000 |
|---|---|---|
| committer | Mike Frysinger <vapier@gentoo.org> | 2011-06-18 19:24:57 +0000 |
| commit | 075a845a9281b4bdef459b6494a7db3bf666b911 (patch) | |
| tree | 153cb39d0879e6148c180453892ffe7ba36f53d9 /sim/bfin/bfin-sim.c | |
| parent | b02cc5b9df3085cad87f914f7616cdec809630bc (diff) | |
| download | gdb-075a845a9281b4bdef459b6494a7db3bf666b911.zip gdb-075a845a9281b4bdef459b6494a7db3bf666b911.tar.gz gdb-075a845a9281b4bdef459b6494a7db3bf666b911.tar.bz2 | |
sim: bfin: fix dsp insns IH saturation/rounding behavior
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>
Diffstat (limited to 'sim/bfin/bfin-sim.c')
| -rw-r--r-- | sim/bfin/bfin-sim.c | 12 |
1 files changed, 11 insertions, 1 deletions
diff --git a/sim/bfin/bfin-sim.c b/sim/bfin/bfin-sim.c index 31136a0..5b8d601 100644 --- a/sim/bfin/bfin-sim.c +++ b/sim/bfin/bfin-sim.c @@ -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: |