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| author | Mike Frysinger <vapier@gentoo.org> | 2011-03-24 03:12:16 +0000 |
|---|---|---|
| committer | Mike Frysinger <vapier@gentoo.org> | 2011-03-24 03:12:16 +0000 |
| commit | beb378a5f2d5d4920dab8b2d7a0b4e3a16a037a0 (patch) | |
| tree | 79e7cb84095cbcec0d223c5eb3f53cb9100e105b /sim | |
| parent | e4a861d14b17b35b165f0f71db04993dcfdaceba (diff) | |
| download | gdb-beb378a5f2d5d4920dab8b2d7a0b4e3a16a037a0.zip gdb-beb378a5f2d5d4920dab8b2d7a0b4e3a16a037a0.tar.gz gdb-beb378a5f2d5d4920dab8b2d7a0b4e3a16a037a0.tar.bz2 | |
sim: bfin: update AV and AC ASTAT bits with acc negation
The Acc=-Acc insn can overflow or carry with edge values, so make sure
we update the ASTAT bits accordingly to match the hardware. Also fix
a thinko where we always updated AC0 even when working with A1 regs.
Signed-off-by: Robin Getz <robin.getz@analog.com>
Signed-off-by: Mike Frysinger <vapier@gentoo.org>
Diffstat (limited to 'sim')
| -rw-r--r-- | sim/bfin/ChangeLog | 6 | ||||
| -rw-r--r-- | sim/bfin/bfin-sim.c | 14 |
2 files changed, 14 insertions, 6 deletions
diff --git a/sim/bfin/ChangeLog b/sim/bfin/ChangeLog index 343e67d..900dc50 100644 --- a/sim/bfin/ChangeLog +++ b/sim/bfin/ChangeLog @@ -1,3 +1,9 @@ +2011-03-23 Robin Getz <robin.getz@analog.com> + + * bfin-sim.c (decode_dsp32alu_0): Call saturate_s40_astat instead of + saturate_s40, and use the v parameter to update the AV bit. Set the + AC bit only when the final result is 0. + 2011-03-23 Mike Frysinger <vapier@gentoo.org> * dv-bfin_sic.c (ENC, DEC_PIN, DEC_SIC): Define. diff --git a/sim/bfin/bfin-sim.c b/sim/bfin/bfin-sim.c index ad12d2d..c78fe1a 100644 --- a/sim/bfin/bfin-sim.c +++ b/sim/bfin/bfin-sim.c @@ -4431,24 +4431,26 @@ decode_dsp32alu_0 (SIM_CPU *cpu, bu16 iw0, bu16 iw1) else if ((aop == 0 || aop == 1) && (HL == 0 || HL == 1) && aopcde == 14) { bs40 src_acc = get_extended_acc (cpu, aop); + int v = 0; TRACE_INSN (cpu, "A%i = - A%i;", HL, aop); - SET_AREG (HL, saturate_s40 (-src_acc)); + SET_AREG (HL, saturate_s40_astat (-src_acc, &v)); SET_ASTATREG (az, AWREG (HL) == 0 && AXREG (HL) == 0); SET_ASTATREG (an, AXREG (HL) >> 7); - SET_ASTATREG (ac0, src_acc == 0); if (HL == 0) { - SET_ASTATREG (av0, src_acc < 0); - if (ASTATREG (av0)) + SET_ASTATREG (ac0, !src_acc); + SET_ASTATREG (av0, v); + if (v) SET_ASTATREG (av0s, 1); } else { - SET_ASTATREG (av1, src_acc < 0); - if (ASTATREG (av1)) + SET_ASTATREG (ac1, !src_acc); + SET_ASTATREG (av1, v); + if (v) SET_ASTATREG (av1s, 1); } } |