diff options
| -rw-r--r-- | erts/emulator/beam/beam_load.c | 23 |
1 files changed, 23 insertions, 0 deletions
diff --git a/erts/emulator/beam/beam_load.c b/erts/emulator/beam/beam_load.c index a476e439ca..73f057929e 100644 --- a/erts/emulator/beam/beam_load.c +++ b/erts/emulator/beam/beam_load.c @@ -3096,6 +3096,29 @@ gen_jump_tab(LoaderState* stp, GenOpArg S, GenOpArg Fail, GenOpArg Size, GenOpAr ASSERT(Size.val >= 2 && Size.val % 2 == 0); /* + * If there is only one choice, don't generate a jump table. + */ + if (Size.val == 2) { + GenOp* jump; + + NEW_GENOP(stp, op); + op->arity = 3; + op->op = genop_is_ne_exact_3; + op->a[0] = Rest[1]; + op->a[1] = S; + op->a[2] = Rest[0]; + + NEW_GENOP(stp, jump); + jump->next = NULL; + jump->arity = 1; + jump->op = genop_jump_1; + jump->a[0] = Fail; + + op->next = jump; + return op; + } + + /* * Calculate the minimum and maximum values and size of jump table. */ |