search for: replacecongruentivs

...hosen which is later hoisted into a different > block by SCEVExpander::hoistIVInc(). This in turn makes the SCEVExpander When is the insert position moved? IOW, what is the "timeline" of events? There are two calls to hoistIVInc in SCEVExpander, in getAddRecExprPHILiterally and in replaceCongruentIVs -- which one is the problematic case? > Builder InsertPt inconsistent (the instruction and block end up not > matching), which leads to an invalid instruction being inserted (with its > parent != its containing block). -- Sanjoy

Hi All, I've run into what appears to be a bug in ScalarEvolution, but I'm not sure if it is instead caused by me missing an implicit assumption between LSR and SCEV. This issue is caused by the change D18001 <http://reviews.llvm.org/D18001> , which is an attempt to increase SCEV-inserted instruction re-use by picking a more canonical insertion position in the case where a new

Hello, Recently I've come across two instances where Induction Variable Simplification lead to noticable performance regressions. In one case, the removal of extra IV lead to the inability to reschedule instructions in a tight loop to reduce stalls. In that case, there were enough registers to spare, so using extra register for extra induction variable was preferable since it reduced