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author | Michał Muskała <[email protected]> | 2017-08-13 14:15:06 +0200 |
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committer | Michał Muskała <[email protected]> | 2017-08-14 14:22:47 +0200 |
commit | cf95a4a8b6a0d57423a89465e950beb16c9606a1 (patch) | |
tree | ed205c0545941b5a1a0e1d21bb64210c097a87b5 /lib/cosProperty | |
parent | f7c9383f4c3d4b6819b5ba4d54c7093df806fe4a (diff) | |
download | otp-cf95a4a8b6a0d57423a89465e950beb16c9606a1.tar.gz otp-cf95a4a8b6a0d57423a89465e950beb16c9606a1.tar.bz2 otp-cf95a4a8b6a0d57423a89465e950beb16c9606a1.zip |
Enhance elimination of useless tests in beam_jump
It can happen we have the following situation:
{test,is_tuple,Fail,[R1]}
{test,test_arity,Fail,[R1,N1]}
{get_tuple_element,R1,N2,R2}
{test,is_eq_exaqct,Fail,[R2,Atom]}
{jump,Fail}
Previously, the optimisation would eliminate the last is_eq_exact test, but
we can do more. If the register R2 is not used in Fail, we can eliminate the
get_tuple_element instruction as well as all the preceding tests. Ultimately,
the whole sequence can be replaced by:
{jump,Fail}
Diffstat (limited to 'lib/cosProperty')
0 files changed, 0 insertions, 0 deletions