[llvm-branch-commits] [NFC][msan] Prepare function to extract main logic (PR #94880)

[via llvm-branch-commits]

llvmbot wrote:


<!--LLVM PR SUMMARY COMMENT-->

@llvm/pr-subscribers-llvm-transforms

Author: Vitaly Buka (vitalybuka)

<details>
<summary>Changes</summary>



---
Full diff: https://github.com/llvm/llvm-project/pull/94880.diff


1 Files Affected:

- (modified) llvm/lib/Transforms/Instrumentation/MemorySanitizer.cpp (+6-4) 


``````````diff
diff --git a/llvm/lib/Transforms/Instrumentation/MemorySanitizer.cpp b/llvm/lib/Transforms/Instrumentation/MemorySanitizer.cpp
index 43b2dee4572a9..d312b0107932b 100644
--- a/llvm/lib/Transforms/Instrumentation/MemorySanitizer.cpp
+++ b/llvm/lib/Transforms/Instrumentation/MemorySanitizer.cpp
@@ -4562,10 +4562,15 @@ struct MemorySanitizerVisitor : public InstVisitor<MemorySanitizerVisitor> {
     Value *B = I.getCondition();
     Value *C = I.getTrueValue();
     Value *D = I.getFalseValue();
+
     Value *Sb = getShadow(B);
     Value *Sc = getShadow(C);
     Value *Sd = getShadow(D);
 
+    Value *Ob = MS.TrackOrigins ? getOrigin(B) : nullptr;
+    Value *Oc = MS.TrackOrigins ? getOrigin(C) : nullptr;
+    Value *Od = MS.TrackOrigins ? getOrigin(D) : nullptr;
+
     // Result shadow if condition shadow is 0.
     Value *Sa0 = IRB.CreateSelect(B, Sc, Sd);
     Value *Sa1;
@@ -4598,10 +4603,7 @@ struct MemorySanitizerVisitor : public InstVisitor<MemorySanitizerVisitor> {
       }
       // a = select b, c, d
       // Oa = Sb ? Ob : (b ? Oc : Od)
-      setOrigin(
-          &I, IRB.CreateSelect(Sb, getOrigin(I.getCondition()),
-                               IRB.CreateSelect(B, getOrigin(I.getTrueValue()),
-                                                getOrigin(I.getFalseValue()))));
+      setOrigin(&I, IRB.CreateSelect(Sb, Ob, IRB.CreateSelect(B, Oc, Od)));
     }
   }
 

``````````

</details>


https://github.com/llvm/llvm-project/pull/94880