[llvm] [IR] Add `samesign` flag to icmp instruction (PR #111419)

[Nikita Popov via llvm-commits]

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@@ -5482,6 +5482,8 @@ Error BitcodeReader::parseFunctionBody(Function *F) {
         if (!CmpInst::isIntPredicate(PredVal))
           return error("Invalid icmp predicate");
         I = new ICmpInst(PredVal, LHS, RHS);
+        if (Record[OpNum] & (1 << bitc::PSSI_SAME_SIGN))
+          cast<ICmpInst>(I)->setSameSign(true);
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nikic wrote:

You can't unconditionally read this, you need to check the record length first. See how the IsFP case for FMF is handled above.

This is the cause of the test failures.

https://github.com/llvm/llvm-project/pull/111419