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authorBjörn Gustavsson <[email protected]>2017-10-06 08:52:32 +0200
committerBjörn Gustavsson <[email protected]>2017-10-09 19:20:55 +0200
commit4fe3f3b8be4825726fab6d4ea7515adf5b5df1ac (patch)
tree6b417bc151f9cb71e7ab1c9ebedbe17cfc358966 /lib/hipe/icode
parente38c688d3961bedcd85f842fd052836cb345a902 (diff)
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Slightly speed up try/catch
The try_end and try_case instructions are implemented the same way (try_case is translated to try_end by the loader). We can do better than that. We know that try_case will only be executed when an exception has been caught. Therefore, we know that x(0) is the non-value and that x(1) through x(3) need to be shifted down to x(0) through x(2). There is no need to test x(0) before shifting down. try_end does not need the register shifting code at all.
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