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| author | Björn Gustavsson <[email protected]> | 2015-04-21 15:21:48 +0200 |
|---|---|---|
| committer | Björn Gustavsson <[email protected]> | 2015-04-29 12:23:41 +0200 |
| commit | 61eaa7570811d81e2a91d0126461a2dac22786dc (patch) | |
| tree | ac883c774e6d0d637e848b9cb0f152b35edcde75 /README.md | |
| parent | 8c32dda686d2b964b08cc4614ba9c445039b3dd9 (diff) | |
| download | otp-61eaa7570811d81e2a91d0126461a2dac22786dc.tar.gz otp-61eaa7570811d81e2a91d0126461a2dac22786dc.tar.bz2 otp-61eaa7570811d81e2a91d0126461a2dac22786dc.zip | |
beam_utils: Be less conservative about liveness for exit instructions
beam_utils used to be overly conservative about liveness for
exit instructions such as:
call_ext erlang:exit/1
beam_utils would consider all y registers to be used, to avoid
overwriting a catch or try tag. That does not seem to be a real
risk.
However, we miss opportunities for stack trimming if we consider
y registers used by an exit instruction.
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