[llvm-branch-commits] [llvm] [CGP] Simple loop strength reduction for vector values (PR #226197)

[Sander de Smalen via llvm-branch-commits]

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@@ -8965,6 +9105,11 @@ bool CodeGenPrepare::optimizeInst(Instruction *I, ModifyDT &ModifiedDT) {
       ++NumPHIsElim;
       return true;
     }
+
+    // Look for simple GEPs on scalable vectors used as data which may
+    // introduce unnecessary multiplies in the loop.
+    if (P->getType()->isScalableTy())
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sdesmalen-arm wrote:

It seems this could also apply to fixed-length vectors (https://godbolt.org/z/WEaPj3oEc).
Can you add a TODO to support that?

https://github.com/llvm/llvm-project/pull/226197