sim: bfin: handle the MM flag in M_IU/M_TFU modes with dsp insns

Our handling of the M_IU/M_TFU modes are missing signed saturation when
the MM flag is set, so add it to match the hardware behavior.

Signed-off-by: Robin Getz <robin.getz@analog.com>
Signed-off-by: Mike Frysinger <vapier@gentoo.org>

diff --git a/sim/bfin/ChangeLog b/sim/bfin/ChangeLog
index 52b75ee..4c3692f 100644 (file)
--- a/sim/bfin/ChangeLog
+++ b/sim/bfin/ChangeLog
@@ -1,5 +1,11 @@
 2011-06-18  Robin Getz  <robin.getz@analog.com>
 
+       * bfin-sim.c (extract_mult): Call saturate_s32 when MM is set
+       and mmod is M_IU.  Call saturate_s16 when MM is set and mmod
+       is M_TFU.
+
+2011-06-18  Robin Getz  <robin.getz@analog.com>
+
        * bfin-sim.c (decode_multfunc): Call new is_macmod_signed, and
        allow MM to sign extend all the time.
        (decode_macfunc): Likewise.  Drop sign extension of unsigned

diff --git a/sim/bfin/bfin-sim.c b/sim/bfin/bfin-sim.c
index 017ddca..71fda3e 100644 (file)
--- a/sim/bfin/bfin-sim.c
+++ b/sim/bfin/bfin-sim.c
@@ -1516,6 +1516,8 @@ extract_mult (SIM_CPU *cpu, bu64 res, int mmod, int MM,
       case M_IS:
        return saturate_s32 (res, overflow);
       case M_IU:
+       if (MM)
+         return saturate_s32 (res, overflow);
        return saturate_u32 (res, overflow);
       case M_FU:
        if (MM)
@@ -1559,6 +1561,8 @@ extract_mult (SIM_CPU *cpu, bu64 res, int mmod, int MM,
       case M_T:
        return saturate_s16 (trunc16 (res), overflow);
       case M_TFU:
+       if (MM)
+         return saturate_s16 (trunc16 (res), overflow);
        return saturate_u16 (trunc16 (res), overflow);
 
       case M_S2RND: