[PATCH] D109091: [SCEV] Further clarify comments regarding UB and zero stride
Philip Reames via Phabricator via llvm-commits
llvm-commits at lists.llvm.org
Tue Sep 7 13:55:03 PDT 2021
This revision was landed with ongoing or failed builds.
This revision was automatically updated to reflect the committed changes.
Closed by commit rG965906997865: [SCEV] Further clarify comments regarding UB and zero stride (authored by reames).
Changed prior to commit:
https://reviews.llvm.org/D109091?vs=370053&id=371180#toc
Repository:
rG LLVM Github Monorepo
CHANGES SINCE LAST ACTION
https://reviews.llvm.org/D109091/new/
https://reviews.llvm.org/D109091
Files:
llvm/lib/Analysis/ScalarEvolution.cpp
Index: llvm/lib/Analysis/ScalarEvolution.cpp
===================================================================
--- llvm/lib/Analysis/ScalarEvolution.cpp
+++ llvm/lib/Analysis/ScalarEvolution.cpp
@@ -11631,9 +11631,9 @@
//
// a) IV is either nuw or nsw depending upon signedness (indicated by the
// NoWrap flag).
- // b) loop is single exit with no side effects.
- // c) loop has no abnormal exits
- //
+ // b) the loop is guaranteed to be finite (e.g. is mustprogress and has
+ // no side effects within the loop)
+ // c) loop has a single static exit (with no abnormal exits)
//
// Precondition a) implies that if the stride is negative, this is a single
// trip loop. The backedge taken count formula reduces to zero in this case.
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