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>
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@ -1,3 +1,9 @@
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2011-03-23 Robin Getz <robin.getz@analog.com>
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* bfin-sim.c (decode_dsp32alu_0): Call saturate_s40_astat instead of
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saturate_s40, and use the v parameter to update the AV bit. Set the
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AC bit only when the final result is 0.
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2011-03-23 Mike Frysinger <vapier@gentoo.org>
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* dv-bfin_sic.c (ENC, DEC_PIN, DEC_SIC): Define.
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@ -4431,24 +4431,26 @@ decode_dsp32alu_0 (SIM_CPU *cpu, bu16 iw0, bu16 iw1)
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else if ((aop == 0 || aop == 1) && (HL == 0 || HL == 1) && aopcde == 14)
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{
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bs40 src_acc = get_extended_acc (cpu, aop);
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int v = 0;
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TRACE_INSN (cpu, "A%i = - A%i;", HL, aop);
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SET_AREG (HL, saturate_s40 (-src_acc));
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SET_AREG (HL, saturate_s40_astat (-src_acc, &v));
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SET_ASTATREG (az, AWREG (HL) == 0 && AXREG (HL) == 0);
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SET_ASTATREG (an, AXREG (HL) >> 7);
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SET_ASTATREG (ac0, src_acc == 0);
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if (HL == 0)
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{
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SET_ASTATREG (av0, src_acc < 0);
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if (ASTATREG (av0))
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SET_ASTATREG (ac0, !src_acc);
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SET_ASTATREG (av0, v);
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if (v)
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SET_ASTATREG (av0s, 1);
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}
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else
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{
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SET_ASTATREG (av1, src_acc < 0);
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if (ASTATREG (av1))
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SET_ASTATREG (ac1, !src_acc);
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SET_ASTATREG (av1, v);
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if (v)
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SET_ASTATREG (av1s, 1);
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}
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}
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