[NFC][msan] Extract handleSelectLikeInst

[vitalybuka]

blendv instructions are very similar to select.
We will add support for them in followup patches.

[llvmbot]

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

@llvm/pr-subscribers-llvm-transforms

Author: Vitaly Buka (vitalybuka)

Changes

blendv instructions are very similar to select.
We will add support for them in followup patches.

---

Full diff: https://github.com/llvm/llvm-project/pull/94881.diff

1 Files Affected:

• (modified) llvm/lib/Transforms/Instrumentation/MemorySanitizer.cpp (+6-1)

diff --git a/llvm/lib/Transforms/Instrumentation/MemorySanitizer.cpp b/llvm/lib/Transforms/Instrumentation/MemorySanitizer.cpp
index d312b0107932b..3993a9290607d 100644
--- a/llvm/lib/Transforms/Instrumentation/MemorySanitizer.cpp
+++ b/llvm/lib/Transforms/Instrumentation/MemorySanitizer.cpp
@@ -4557,12 +4557,17 @@ struct MemorySanitizerVisitor : public InstVisitor<MemorySanitizerVisitor> {
   }
 
   void visitSelectInst(SelectInst &I) {
-    IRBuilder<> IRB(&I);
     // a = select b, c, d
     Value *B = I.getCondition();
     Value *C = I.getTrueValue();
     Value *D = I.getFalseValue();
 
+    handleSelectLikeInst(I, B, C, D);
+  }
+
+  void handleSelectLikeInst(Instruction &I, Value *B, Value *C, Value *D) {
+    IRBuilder<> IRB(&I);
+
     Value *Sb = getShadow(B);
     Value *Sc = getShadow(C);
     Value *Sd = getShadow(D);