[llvm] r270629 - [LoopUnrollAnalyzer] Fix a crash in UnrolledInstAnalyzer::visitCastInst.

[Eli Friedman via llvm-commits]

On Tue, May 24, 2016 at 3:59 PM, Michael Zolotukhin via llvm-commits <
llvm-commits at lists.llvm.org> wrote:

> Author: mzolotukhin
> Date: Tue May 24 17:59:58 2016
> New Revision: 270629
>
> URL: http://llvm.org/viewvc/llvm-project?rev=270629&view=rev
> Log:
> [LoopUnrollAnalyzer] Fix a crash in UnrolledInstAnalyzer::visitCastInst.
>
> This fixes PR27847. Now for real.
>
> Modified:
>     llvm/trunk/lib/Analysis/LoopUnrollAnalyzer.cpp
>     llvm/trunk/test/Transforms/LoopUnroll/full-unroll-crashers.ll
>
> Modified: llvm/trunk/lib/Analysis/LoopUnrollAnalyzer.cpp
> URL:
> http://llvm.org/viewvc/llvm-project/llvm/trunk/lib/Analysis/LoopUnrollAnalyzer.cpp?rev=270629&r1=270628&r2=270629&view=diff
>
> ==============================================================================
> --- llvm/trunk/lib/Analysis/LoopUnrollAnalyzer.cpp (original)
> +++ llvm/trunk/lib/Analysis/LoopUnrollAnalyzer.cpp Tue May 24 17:59:58 2016
> @@ -141,11 +141,7 @@ bool UnrolledInstAnalyzer::visitCastInst
>    Constant *COp = dyn_cast<Constant>(I.getOperand(0));
>    if (!COp)
>      COp = SimplifiedValues.lookup(I.getOperand(0));
> -  if (COp) {
> -    if (COp->getType() == I.getType()) {
> -      SimplifiedValues[&I] = cast<Constant>(COp);
> -      return true;
> -    }
> +  if (COp && CastInst::castIsValid(I.getOpcode(), COp, I.getType())) {
>

How are you getting into a situation where "V.getType() !=
SimplifiedValues.lookup(V).getType()"?  It seems like there's an underlying
problem which is getting ignored here.

-Eli
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