[clang] [clang] Fix division by zero in ACLEIntrinsic constructor (PR #115883)

[Aaron Ballman via cfe-commits]

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@@ -1415,7 +1415,10 @@ ACLEIntrinsic::ACLEIntrinsic(EmitterBase &ME, const Record *R,
         } else if (Bounds->getName() == "IB_LaneIndex") {
           IA.boundsType = ImmediateArg::BoundsType::ExplicitRange;
           IA.i1 = 0;
-          IA.i2 = 128 / Param->sizeInBits() - 1;
+          unsigned sizeInBits = Param->sizeInBits();
+          if (sizeInBits == 0)
+            PrintFatalError("Division by zero: Param->sizeInBits() is zero.");
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AaronBallman wrote:

Oh! Good catch (and interesting to know)!

Regardless, this diagnostic is saying what the code is doing wrong, not what the user of tablegen is doing wrong. The diagnostic should be written such that it helps the developer figure out how to fix their code.

https://github.com/llvm/llvm-project/pull/115883