diff options
Diffstat (limited to 'sim/d10v/simops.c')
| -rw-r--r-- | sim/d10v/simops.c | 5 |
1 files changed, 3 insertions, 2 deletions
diff --git a/sim/d10v/simops.c b/sim/d10v/simops.c index 222d2d4..d617cb4 100644 --- a/sim/d10v/simops.c +++ b/sim/d10v/simops.c @@ -2483,7 +2483,7 @@ OP_1000 () /* see ../common/sim-alu.h for a more extensive discussion on how to compute the carry/overflow bits */ tmp = a - b; - State.C = (a < b); + State.C = (a >= b); State.regs[OP[0]] = (tmp >> 16) & 0xffff; State.regs[OP[0]+1] = tmp & 0xffff; trace_output (OP_DREG); @@ -2585,7 +2585,8 @@ OP_1 () trace_input ("subi", OP_REG, OP_CONSTANT16, OP_VOID); /* see ../common/sim-alu.h for a more extensive discussion on how to - compute the carry/overflow bits */ + compute the carry/overflow bits. */ + /* since OP[1] is never <= 0, -OP[1] == ~OP[1]+1 can never overflow */ tmp = ((unsigned)(unsigned16) State.regs[OP[0]] + (unsigned)(unsigned16) ( - OP[1])); State.C = (tmp >= (1 << 16)); |