[Bug tree-optimization/113434] [13/14 Regression] VRP misses conditional in loop is always false sometimes
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=113434 Richard Biener changed: What|Removed |Added CC||rguenth at gcc dot gnu.org Priority|P3 |P2 --- Comment #2 from Richard Biener --- It needs LIM (store-motion) to make 'a' a register inside the loop but that runs after VRP1, the next VRP only runs after SCCP and also IVOPTs which confuses it. With -fno-ivopts it's OK but still too late for SCCP. Thus, a pass ordering issue between LIM / VRP and a missed VRP after IVOPTs obfuscation. We might want to consider doing store-motion even earlier ...
[Bug tree-optimization/113434] [13/14 Regression] VRP misses conditional in loop is always false sometimes
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=113434 Andrew Pinski changed: What|Removed |Added Status|UNCONFIRMED |NEW Target Milestone|--- |13.3 Last reconfirmed||2024-01-17 Ever confirmed|0 |1 Summary|[13/14 Regression] Missed |[13/14 Regression] VRP |optimization for Loop |misses conditional in loop |Unswitch|is always false sometimes --- Comment #1 from Andrew Pinski --- Confirmed. Note it is not loop switching but rather VRP which should have figured out a bounds are [2,202] inside the loop but for some reason it is not able to.
