diff options
Diffstat (limited to 'sim/d10v/simops.c')
| -rw-r--r-- | sim/d10v/simops.c | 16 |
1 files changed, 10 insertions, 6 deletions
diff --git a/sim/d10v/simops.c b/sim/d10v/simops.c index 64c8a33..723a7d9 100644 --- a/sim/d10v/simops.c +++ b/sim/d10v/simops.c @@ -1912,18 +1912,20 @@ OP_5201 () } State.F1 = State.F0; + tmp = SEXT56 ((State.a[0] << 16) | (State.a[1] & 0xffff)); if (shift >=0) - tmp = ((State.a[0] << 16) | (State.a[1] & 0xffff)) << shift; + tmp <<= shift; else - tmp = ((State.a[0] << 16) | (State.a[1] & 0xffff)) >> -shift; - tmp = ( SEXT60(tmp) + 0x8000 ) >> 16; - if (tmp > MAX32) + tmp >>= -shift; + tmp += 0x8000; + tmp >>= 16; /* look at bits 0:43 */ + if (tmp > SEXT44 (SIGNED64 (0x0007fffffff))) { State.regs[OP[0]] = 0x7fff; State.regs[OP[0]+1] = 0xffff; State.F0 = 1; } - else if (tmp < MIN32) + else if (tmp < SEXT44 (SIGNED64 (0xfff80000000))) { State.regs[OP[0]] = 0x8000; State.regs[OP[0]+1] = 0; @@ -2429,8 +2431,10 @@ OP_0 () uint16 tmp; trace_input ("sub", OP_REG, OP_REG, OP_VOID); + /* see ../common/sim-alu.h for a more extensive discussion on how to + compute the carry/overflow bits. */ tmp = State.regs[OP[0]] - State.regs[OP[1]]; - State.C = (tmp > State.regs[OP[0]]); + State.C = ((uint16) State.regs[OP[0]] >= (uint16) State.regs[OP[1]]); State.regs[OP[0]] = tmp; trace_output (OP_REG); } |