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While reviewing a fix for maintaining loop metadata (http://reviews.llvm.org/D5539) I noticed that we make a strict assumption about the metadata being attached to the branch that is an immediate predecessor of the loop header. This does not work well with LLVM's approach of lazy critical edge splitting. I've proposed working around this with heroics inside the critical e...

...rnold Schwaighofer" >> <aschwaighofer at apple.com> >> Sent: Monday, October 6, 2014 12:55:11 PM >> Subject: llvm.loop metadata placement and critical edge splitting >> >> While reviewing a fix for maintaining loop metadata >> (http://reviews.llvm.org/D5539) I noticed that we make a strict >> assumption about the metadata being attached to the branch that is an >> immediate predecessor of the loop header. This does not work well >> with LLVM's approach of lazy critical edge splitting. I've proposed >> working around...