[llvm] [nsan] minor fix for the nsan pass (PR #101147)

[via llvm-commits]

llvmbot wrote:


<!--LLVM PR SUMMARY COMMENT-->

@llvm/pr-subscribers-compiler-rt-sanitizer

Author: Wu Yingcong (yingcong-wu)

<details>
<summary>Changes</summary>

1. Avoid an auto copy
2. use cast instead to replace dyn_cast when dyn_cast is not needed/not checked.

---
Full diff: https://github.com/llvm/llvm-project/pull/101147.diff


1 Files Affected:

- (modified) llvm/lib/Transforms/Instrumentation/NumericalStabilitySanitizer.cpp (+2-2) 


``````````diff
diff --git a/llvm/lib/Transforms/Instrumentation/NumericalStabilitySanitizer.cpp b/llvm/lib/Transforms/Instrumentation/NumericalStabilitySanitizer.cpp
index 832506f639a74..5872396669435 100644
--- a/llvm/lib/Transforms/Instrumentation/NumericalStabilitySanitizer.cpp
+++ b/llvm/lib/Transforms/Instrumentation/NumericalStabilitySanitizer.cpp
@@ -1715,7 +1715,7 @@ Value *NumericalStabilitySanitizer::createShadowValueWithOperandsAvailable(
                                Map.getShadow(BinOp->getOperand(1)));
 
   if (isa<UIToFPInst>(&Inst) || isa<SIToFPInst>(&Inst)) {
-    auto *Cast = dyn_cast<CastInst>(&Inst);
+    auto *Cast = cast<CastInst>(&Inst);
     return Builder.CreateCast(Cast->getOpcode(), Cast->getOperand(0),
                               ExtendedVT);
   }
@@ -2168,7 +2168,7 @@ bool NumericalStabilitySanitizer::sanitizeFunction(
 
   // The last pass populates shadow phis with shadow values.
   for (PHINode *Phi : OriginalPhis) {
-    PHINode *ShadowPhi = dyn_cast<PHINode>(ValueToShadow.getShadow(Phi));
+    PHINode *ShadowPhi = cast<PHINode>(ValueToShadow.getShadow(Phi));
     for (unsigned I : seq(Phi->getNumOperands())) {
       Value *V = Phi->getOperand(I);
       Value *Shadow = ValueToShadow.getShadow(V);

``````````

</details>


https://github.com/llvm/llvm-project/pull/101147