[llvm] [GlobalISel] Support GISelValueTracking for G_FREEZE. (PR #223696)

[Vikash Gupta via llvm-commits]

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@@ -2253,6 +2261,13 @@ void GISelValueTracking::computeKnownFPClass(Register R,
     }
     break;
   }
+  case TargetOpcode::G_FREEZE: {
+    Register Src = MI.getOperand(1).getReg();
+    if (isGuaranteedNotToBeUndefOrPoison(Src, MRI, Depth + 1))
+      computeKnownFPClass(Src, DemandedElts, InterestedClasses, Known,
+                          Depth + 1);
+    break;
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vg0204 wrote:

There isn't any. break does not reach another case. The only thing after the switch is the scope_exit that applies nnan/ninf from this instruction, and G_FREEZE never has those flags. If

https://github.com/llvm/llvm-project/pull/223696