diff --git a/llvm/lib/Transforms/Scalar/CallSiteSplitting.cpp b/llvm/lib/Transforms/Scalar/CallSiteSplitting.cpp
--- a/llvm/lib/Transforms/Scalar/CallSiteSplitting.cpp
+++ b/llvm/lib/Transforms/Scalar/CallSiteSplitting.cpp
@@ -424,22 +424,20 @@
   if (Instr != Parent->getFirstNonPHIOrDbg())
     return false;
 
-  for (auto &BI : *Parent) {
-    if (PHINode *PN = dyn_cast<PHINode>(&BI)) {
-      for (auto &I : CS.args())
-        if (&*I == PN) {
-          assert(PN->getNumIncomingValues() == 2 &&
-                 "Unexpected number of incoming values");
-          if (PN->getIncomingBlock(0) == PN->getIncomingBlock(1))
-            return false;
-          if (PN->getIncomingValue(0) == PN->getIncomingValue(1))
-            continue;
-          if (isa<Constant>(PN->getIncomingValue(0)) &&
-              isa<Constant>(PN->getIncomingValue(1)))
-            return true;
-        }
+  for (auto &PN : Parent->phis()) {
+    for (auto &Arg : CS.args()) {
+      if (&*Arg != &PN)
+        continue;
+      assert(PN.getNumIncomingValues() == 2 &&
+             "Unexpected number of incoming values");
+      if (PN.getIncomingBlock(0) == PN.getIncomingBlock(1))
+        return false;
+      if (PN.getIncomingValue(0) == PN.getIncomingValue(1))
+        continue;
+      if (isa<Constant>(PN.getIncomingValue(0)) &&
+          isa<Constant>(PN.getIncomingValue(1)))
+        return true;
     }
-    break;
   }
   return false;
 }
diff --git a/llvm/test/Transforms/CallSiteSplitting/callsite-split-or-phi.ll b/llvm/test/Transforms/CallSiteSplitting/callsite-split-or-phi.ll
--- a/llvm/test/Transforms/CallSiteSplitting/callsite-split-or-phi.ll
+++ b/llvm/test/Transforms/CallSiteSplitting/callsite-split-or-phi.ll
@@ -586,3 +586,37 @@
 End:
   ret void
 }
+
+; CHECK-LABEL: i32 @test_multiple_phis(
+; CHECK:      Header.split:
+; CHECK-NEXT:   %r2 = call i32 @callee(i32* null, i32 1, i32 5)
+; CHECK-NEXT:   br label %Tail
+
+; CHECK:      TBB.split:
+; CHECK-NEXT:   %r1 = call i32 @callee(i32* null, i32 2, i32 10)
+; CHECK-NEXT:   br label %Tail
+
+; CHECK:        Tail:
+; CHECK-NEXT:   %phi.call = phi i32 [ %r1, %TBB.split ], [ %r2, %Header.split ]
+; CHECK-NEXT:   %p.0 = phi i32 [ 0, %Header.split ], [ 99, %TBB.split ]
+; CHECK-NEXT:   %res = add i32 %phi.call, %p.0
+; CHECK-NEXT:   ret i32 %phi.call
+;
+define i32 @test_multiple_phis(i1 %c.1) {
+Header:
+  br i1 %c.1, label %Tail, label %TBB
+
+TBB:
+  br label %Tail
+
+Tail:
+  %p.0 = phi i32 [0, %Header], [99, %TBB]
+  %p.1 = phi i32[1, %Header], [2, %TBB]
+  %p.2 = phi i32 [5, %Header], [10, %TBB]
+  %r = call i32 @callee(i32* null, i32 %p.1, i32 %p.2)
+  %res = add i32 %r, %p.0
+  ret i32 %r
+
+End:
+  ret i32 10
+}