[Mlir-commits] [mlir] [mlir][SCFToSPIRV] Fix iter_args returning undef on zero trip scf.for (PR #206280)

[Igor Wodiany]

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@@ -214,6 +214,16 @@ struct ForOpConversion final : SCFToSPIRVPattern<scf::ForOp> {
       initTypes.push_back(arg.getType());
     replaceSCFOutputValue(forOp, loopOp, rewriter, scfToSPIRVContext,
                           initTypes);
+
+    // Store init values so a zero-trip loop returns them instead of undef.
+    // Skip the stores if the loop is known to always execute at least once.
+    std::optional<APInt> tripCount = forOp.getStaticTripCount();
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IgWod wrote:

Should we also add a test for the case where `tripCount` is not static?

https://github.com/llvm/llvm-project/pull/206280