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| author | Mike Frysinger <vapier@gentoo.org> | 2011-06-18 21:22:50 +0000 |
|---|---|---|
| committer | Mike Frysinger <vapier@gentoo.org> | 2011-06-18 21:22:50 +0000 |
| commit | a56a195412e4998a0b59d4610aaaec3df55784d2 (patch) | |
| tree | 26ece002a6dad75bee2f4301495bba2346728cf2 /sim/bfin/bfin-sim.c | |
| parent | 90e13d65c1d6cc1d474a216eee760780a6c6f1ea (diff) | |
| download | gdb-a56a195412e4998a0b59d4610aaaec3df55784d2.zip gdb-a56a195412e4998a0b59d4610aaaec3df55784d2.tar.gz gdb-a56a195412e4998a0b59d4610aaaec3df55784d2.tar.bz2 | |
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>
Diffstat (limited to 'sim/bfin/bfin-sim.c')
| -rw-r--r-- | sim/bfin/bfin-sim.c | 44 |
1 files changed, 30 insertions, 14 deletions
diff --git a/sim/bfin/bfin-sim.c b/sim/bfin/bfin-sim.c index b982aaf..20602b7 100644 --- a/sim/bfin/bfin-sim.c +++ b/sim/bfin/bfin-sim.c @@ -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) |