diff options
| -rw-r--r-- | sim/bfin/ChangeLog | 7 | ||||
| -rw-r--r-- | sim/bfin/bfin-sim.c | 36 |
2 files changed, 36 insertions, 7 deletions
diff --git a/sim/bfin/ChangeLog b/sim/bfin/ChangeLog index ffd9ff2..c702981 100644 --- a/sim/bfin/ChangeLog +++ b/sim/bfin/ChangeLog @@ -1,5 +1,12 @@ 2011-06-18 Robin Getz <robin.getz@analog.com> + * bfin-sim.c (decode_dsp32shiftimm_0): With left shift vector insns, + call lshift only when count is positive. Otherwise, call ashiftrt. + With arithmetic right shift insns, call ashiftrt when the value is + small enough, otherwise call lshift. + +2011-06-18 Robin Getz <robin.getz@analog.com> + * bfin-sim.c (extract_mult): Call saturate_s16 directly when mmod is M_IH rather than computing the result by hand. diff --git a/sim/bfin/bfin-sim.c b/sim/bfin/bfin-sim.c index 38e5fe1..11eea3a 100644 --- a/sim/bfin/bfin-sim.c +++ b/sim/bfin/bfin-sim.c @@ -5678,7 +5678,10 @@ decode_dsp32shiftimm_0 (SIM_CPU *cpu, bu16 iw0, bu16 iw1) TRACE_INSN (cpu, "R%i.%c = R%i.%c >>> %i;", dst0, (HLs & 2) ? 'H' : 'L', src1, (HLs & 1) ? 'H' : 'L', newimmag); - result = ashiftrt (cpu, in, newimmag, 16); + if (newimmag > 16) + result = lshift (cpu, in, 16 - (newimmag & 0xF), 16, 0); + else + result = ashiftrt (cpu, in, newimmag, 16); } else if (sop == 1 && bit8 == 0) { @@ -5786,9 +5789,18 @@ decode_dsp32shiftimm_0 (SIM_CPU *cpu, bu16 iw0, bu16 iw1) bu32 astat; TRACE_INSN (cpu, "R%i = R%i << %i (V,S);", dst0, src1, count); - val0 = lshift (cpu, val0, count, 16, 1); - astat = ASTAT; - val1 = lshift (cpu, val1, count, 16, 1); + if (count >= 0) + { + val0 = lshift (cpu, val0, count, 16, 1); + astat = ASTAT; + val1 = lshift (cpu, val1, count, 16, 1); + } + else + { + val0 = ashiftrt (cpu, val0, -count, 16); + astat = ASTAT; + val1 = ashiftrt (cpu, val1, -count, 16); + } SET_ASTAT (ASTAT | astat); STORE (DREG (dst0), (val0 << 16) | val1); @@ -5833,9 +5845,19 @@ decode_dsp32shiftimm_0 (SIM_CPU *cpu, bu16 iw0, bu16 iw1) TRACE_INSN (cpu, "R%i = R%i >>> %i %s;", dst0, src1, count, sop == 0 ? "(V)" : "(V,S)"); - val0 = ashiftrt (cpu, val0, count, 16); - astat = ASTAT; - val1 = ashiftrt (cpu, val1, count, 16); + if (count & 0x10) + { + val0 = lshift (cpu, val0, 16 - (count & 0xF), 16, 0); + astat = ASTAT; + val1 = lshift (cpu, val1, 16 - (count & 0xF), 16, 0); + } + else + { + val0 = ashiftrt (cpu, val0, count, 16); + astat = ASTAT; + val1 = ashiftrt (cpu, val1, count, 16); + } + SET_ASTAT (ASTAT | astat); STORE (DREG (dst0), REG_H_L (val1 << 16, val0)); |