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| author | Björn Gustavsson <[email protected]> | 2015-12-07 16:12:21 +0100 |
|---|---|---|
| committer | Björn Gustavsson <[email protected]> | 2016-04-07 15:28:29 +0200 |
| commit | e93a66110aa27a5b8228fb46a3459a6de0e626d0 (patch) | |
| tree | 856ab34d2bcf08fdbb7a6360534c842f6b5a8f15 /erts/emulator/beam/beam_load.c | |
| parent | c6cabe0b76dda183d209498e1e4e13e3407dcf9b (diff) | |
| download | otp-e93a66110aa27a5b8228fb46a3459a6de0e626d0.tar.gz otp-e93a66110aa27a5b8228fb46a3459a6de0e626d0.tar.bz2 otp-e93a66110aa27a5b8228fb46a3459a6de0e626d0.zip | |
Introduce a 'rename' instruction
Introduce a 'rename' instruction that can be used to optimize
simple renaming with unchanged operands such as:
get_tuple_element Reg P Dst => i_get_tuple_element Reg P Dst
By allowing it to lower the arity of instruction, transformations
such as the following can be handled:
trim N Remaining => i_trim N
All in all, currently 67 transformations can be optimized in this
way, including some commonly used ones.
Diffstat (limited to 'erts/emulator/beam/beam_load.c')
| -rw-r--r-- | erts/emulator/beam/beam_load.c | 6 |
1 files changed, 6 insertions, 0 deletions
diff --git a/erts/emulator/beam/beam_load.c b/erts/emulator/beam/beam_load.c index 5d03c98657..ad174664ae 100644 --- a/erts/emulator/beam/beam_load.c +++ b/erts/emulator/beam/beam_load.c @@ -5077,6 +5077,12 @@ transform_engine(LoaderState* st) instr->arity = gen_opc[op].arity; ap = 0; break; +#ifdef TOP_rename + case TOP_rename: + instr->op = op = *pc++; + instr->arity = gen_opc[op].arity; + return TE_OK; +#endif case TOP_store_type: i = *pc++; instr->a[ap].type = i; |