http://gcc.gnu.org/bugzilla/show_bug.cgi?id=58455
Jeffrey A. Law <law at redhat dot com> changed:
What |Removed |Added
----------------------------------------------------------------------------
CC| |law at redhat dot com
Blocks| |19794
--- Comment #7 from Jeffrey A. Law <law at redhat dot com> ---
I've long pondered separating jump threading from DOM and making jump threading
a backwards walk of the use-def chains from the condition.
Given such a structure one could envision a knob which controlled how far back
in the use-def chains we walk. If that knob just allowed walking one
statement, we'd catch the jump threads in blocks #4 and #7 trivially.
But that's all work far into the future.
Of course that still leaves an open question about what, if any threading we'd
want to do at -Og. We'd certainly have to look at that closely.
