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sim: bfin: handle V overflows in dsp mult insns 

The current dsp mult handler does not take care of overflows and updating
the V ASTAT bit.  So implement it.

Signed-off-by: Robin Getz <robin.getz@analog.com>
Signed-off-by: Mike Frysinger <vapier@gentoo.org>
This commit is contained in:
Mike Frysinger 2011-03-15 20:09:09 +00:00
parent bf416ccded
commit 9b7509d900
2 changed files with 15 additions and 7 deletions
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6
sim/bfin/ChangeLog
View File

@ -1,3 +1,9 @@
2011-03-15 Robin Getz <robin.getz@analog.com>
* bfin-sim.c (decode_dsp32mult_0): Declare v_i0 and v_i1. Pass to
the extract_mult functions. Include these when updating the V, VS,
and V_COPY bits.
2011-03-15 Robin Getz <robin.getz@analog.com>
* bfin-sim.c (astat_names): New global bit array.

16
sim/bfin/bfin-sim.c
View File

@ -3851,7 +3851,7 @@ decode_dsp32mult_0 (SIM_CPU *cpu, bu16 iw0, bu16 iw1)
int h01 = ((iw1 >> DSP32Mac_h01_bits) & DSP32Mac_h01_mask);
bu32 res = DREG (dst);
bu32 sat0 = 0, sat1 = 0;
bu32 sat0 = 0, sat1 = 0, v_i0 = 0, v_i1 = 0;
char _buf[128], *buf = _buf;
int _MM = MM;
@ -3874,7 +3874,7 @@ decode_dsp32mult_0 (SIM_CPU *cpu, bu16 iw0, bu16 iw1)
if (w1)
{
bu64 r = decode_multfunc (cpu, h01, h11, src0, src1, mmod, MM, &sat1);
bu32 res1 = extract_mult (cpu, r, mmod, MM, P, NULL);
bu32 res1 = extract_mult (cpu, r, mmod, MM, P, &v_i1);
buf += sprintf (buf, P ? "R%i" : "R%i.H", dst + P);
buf += sprintf (buf, " = R%i.%c * R%i.%c",
@ -3902,7 +3902,7 @@ decode_dsp32mult_0 (SIM_CPU *cpu, bu16 iw0, bu16 iw1)
if (w0)
{
bu64 r = decode_multfunc (cpu, h00, h10, src0, src1, mmod, 0, &sat0);
bu32 res0 = extract_mult (cpu, r, mmod, 0, P, NULL);
bu32 res0 = extract_mult (cpu, r, mmod, 0, P, &v_i0);
buf += sprintf (buf, P ? "R%i" : "R%i.L", dst);
buf += sprintf (buf, " = R%i.%c * R%i.%c",
@ -3926,10 +3926,12 @@ decode_dsp32mult_0 (SIM_CPU *cpu, bu16 iw0, bu16 iw1)
if (w0 || w1)
{
STORE (ASTATREG (v), sat0 | sat1);
STORE (ASTATREG (v_copy), sat0 | sat1);
if (sat0 | sat1)
STORE (ASTATREG (vs), 1);
bu32 v = sat0 | sat1 | v_i0 | v_i1;
STORE (ASTATREG (v), v);
STORE (ASTATREG (v_copy), v);
if (v)
STORE (ASTATREG (vs), v);
}
}