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sim: bfin: always do 16bit sign extension with the SEARCH insn

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The Blackfin PRM does not cover this case, but the hardware is clear: even
if the search criteria is not met (and thus a new 16bit value is loaded up
into the accumulator), the accumulator undergoes 16bit sign extension.  So
simply reload the low signed 16bits in that case.

Signed-off-by: Robin Getz <robin.getz@analog.com>
Signed-off-by: Mike Frysinger <vapier@gentoo.org>
This commit is contained in:
Mike Frysinger 2011-03-24 03:13:32 +00:00
parent beb378a5f2
commit de0addfbef
2 changed files with 10 additions and 0 deletions
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5
sim/bfin/ChangeLog
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@ -1,3 +1,8 @@
2011-03-23 Robin Getz <robin.getz@analog.com>
* bfin-sim.c (decode_dsp32alu_0): Set A1 to a1_lo when up_hi is false,
and set A0 to a0_lo when up_lo is false.
2011-03-23 Robin Getz <robin.getz@analog.com>
* bfin-sim.c (decode_dsp32alu_0): Call saturate_s40_astat instead of

5
sim/bfin/bfin-sim.c
View File

@ -5041,11 +5041,16 @@ decode_dsp32alu_0 (SIM_CPU *cpu, bu16 iw0, bu16 iw1)
SET_AREG (1, src_hi);
SET_DREG (dst1, PREG (0));
}
else
SET_AREG (1, a1_lo);
if (up_lo)
{
SET_AREG (0, src_lo);
SET_DREG (dst0, PREG (0));
}
else
SET_AREG (0, a0_lo);
}
else
illegal_instruction (cpu);