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authorBjörn Gustavsson <[email protected]>2018-04-04 15:14:54 +0200
committerBjörn Gustavsson <[email protected]>2018-04-04 15:34:34 +0200
commit282fb67730e1bafe722e7149a35e272398f88b34 (patch)
tree5e7882c457fc8e480e369b878ab8b43d2f0cf9af /HOWTO/DTRACE.md
parentf99860259ee557851acc865519a315f04d1d4d51 (diff)
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Fix unsafe optimization of record test
beam_record would make an unsafe optimization for the not_used_p/4 function added to beam_utils_SUITE in this commit. The bug is in beam_utils, which would falsely report that {x,4} was unused when it in fact was used. The bug was in the function not_used/1. The purpose of not_used/1 is to return a 'not_used' result unless the actual result is 'used'. Unfortunately it was not implemented in that way. It would let a 'transparent' result slip through, which the caller in this case would convert to 'killed' (because the register was killed on all other paths). Reported-by: Richard Carlsson
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