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authorMike Frysinger <vapier@gentoo.org>2011-06-18 21:22:50 +0000
committerMike Frysinger <vapier@gentoo.org>2011-06-18 21:22:50 +0000
commita56a195412e4998a0b59d4610aaaec3df55784d2 (patch)
tree26ece002a6dad75bee2f4301495bba2346728cf2
parent90e13d65c1d6cc1d474a216eee760780a6c6f1ea (diff)
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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>
-rw-r--r--sim/bfin/ChangeLog5
-rw-r--r--sim/bfin/bfin-sim.c44
2 files changed, 35 insertions, 14 deletions
diff --git a/sim/bfin/ChangeLog b/sim/bfin/ChangeLog
index 31efa11..5033c22 100644
--- a/sim/bfin/ChangeLog
+++ b/sim/bfin/ChangeLog
@@ -1,5 +1,10 @@
2011-06-18 Robin Getz <robin.getz@analog.com>
+ * bfin-sim.c (decode_macfunc): Handle MM when mmod is M_TFU.
+ Check MM once when mmod is M_FU to match M_TFU better.
+
+2011-06-18 Robin Getz <robin.getz@analog.com>
+
* bfin-sim.c (decode_dsp32shiftimm_0): When shift is greater than
32, perform a left shift. Update the corresponding AV bit. Set
AZ when the low 32bits are also zero.
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)