diff options
Diffstat (limited to 'sim')
| -rw-r--r-- | sim/bfin/ChangeLog | 7 | ||||
| -rw-r--r-- | sim/bfin/bfin-sim.c | 70 |
2 files changed, 67 insertions, 10 deletions
diff --git a/sim/bfin/ChangeLog b/sim/bfin/ChangeLog index cf6beb1..14cb28d 100644 --- a/sim/bfin/ChangeLog +++ b/sim/bfin/ChangeLog @@ -1,3 +1,10 @@ +2012-04-09 Robin Getz <robin.getz@analog.com> + + * bfin-sim.c (sgn_extend): New helper. + (decode_dsp32shiftimm_0): Call lshift when newimmag is more + than 16, otherwise call ashiftrt. Set ASTAT fields as needed. + For accumulator shifts, call new sgn_extend helper. + 2012-04-08 Mike Frysinger <vapier@gentoo.org> * bfin-sim.c (illegal_instruction_or_combination): New helper. diff --git a/sim/bfin/bfin-sim.c b/sim/bfin/bfin-sim.c index 03b9d7a..e3201ef 100644 --- a/sim/bfin/bfin-sim.c +++ b/sim/bfin/bfin-sim.c @@ -5716,6 +5716,26 @@ decode_dsp32shift_0 (SIM_CPU *cpu, bu16 iw0, bu16 iw1) illegal_instruction (cpu); } +static bu64 +sgn_extend (bu40 org, bu40 val, int size) +{ + bu64 ret = val; + + if (org & (1ULL << (size - 1))) + { + /* We need to shift in to the MSB which is set. */ + int n; + + for (n = 40; n >= 0; n--) + if (ret & (1ULL << n)) + break; + ret |= (-1ULL << n); + } + else + ret &= ~(-1ULL << 39); + + return ret; +} static void decode_dsp32shiftimm_0 (SIM_CPU *cpu, bu16 iw0, bu16 iw1) { @@ -5765,8 +5785,37 @@ decode_dsp32shiftimm_0 (SIM_CPU *cpu, bu16 iw0, bu16 iw1) { TRACE_INSN (cpu, "R%i.%c = R%i.%c >>> %i (S);", dst0, (HLs & 2) ? 'H' : 'L', - src1, (HLs & 1) ? 'H' : 'L', immag); - result = lshift (cpu, in, immag, 16, 1, 1); + src1, (HLs & 1) ? 'H' : 'L', newimmag); + if (newimmag > 16) + { + int shift = 32 - newimmag; + bu16 inshift = in << shift; + + if (((inshift & ~0xFFFF) + && ((inshift & ~0xFFFF) >> 16) != ~(~0 << shift)) + || (inshift & 0x8000) != (in & 0x8000)) + { + if (in & 0x8000) + result = 0x8000; + else + result = 0x7fff; + SET_ASTATREG (v, 1); + SET_ASTATREG (vs, 1); + } + else + { + result = inshift; + SET_ASTATREG (v, 0); + } + + SET_ASTATREG (az, !result); + SET_ASTATREG (an, !!(result & 0x8000)); + } + else + { + result = ashiftrt (cpu, in, newimmag, 16); + result = sgn_extend (in, result, 16); + } } else if (sop == 2 && bit8) { @@ -5808,22 +5857,23 @@ decode_dsp32shiftimm_0 (SIM_CPU *cpu, bu16 iw0, bu16 iw1) else if (sop == 0 && sopcde == 3 && bit8 == 1) { /* Arithmetic shift, so shift in sign bit copies. */ - bu64 acc; + bu64 acc, val; int shift = uimm5 (newimmag); HLs = !!HLs; TRACE_INSN (cpu, "A%i = A%i >>> %i;", HLs, HLs, shift); acc = get_extended_acc (cpu, HLs); - acc >>= shift; + val = acc >> shift; + /* Sign extend again. */ - if (acc & (1ULL << 39)) - acc |= -(1ULL << 39); - else - acc &= ~(-(1ULL << 39)); + val = sgn_extend (acc, val, 40); - STORE (AXREG (HLs), (acc >> 32) & 0xFF); - STORE (AWREG (HLs), acc & 0xFFFFFFFF); + STORE (AXREG (HLs), (val >> 32) & 0xFF); + STORE (AWREG (HLs), val & 0xFFFFFFFF); + STORE (ASTATREG (an), !!(val & (1ULL << 39))); + STORE (ASTATREG (az), !val); + STORE (ASTATREG (av[HLs]), 0); } else if ((sop == 0 && sopcde == 3 && bit8 == 0) || (sop == 1 && sopcde == 3)) |