From 3dd0d690f3b31f058f885af75719a2d2fd9e75ca Mon Sep 17 00:00:00 2001
From: Nick Lewycky <nicholas@mxc.ca>
Date: Thu, 28 May 2009 04:08:10 +0000
Subject: [PATCH] Use Operands.data() instead of &Operands[0] where Operands is
 a potentially empty SmallVector.

llvm-svn: 72512
---
 lib/Transforms/Scalar/SCCP.cpp                       |  2 +-
 test/Transforms/SCCP/2009-05-27-VectorOperandZero.ll | 10 ++++++++++
 2 files changed, 11 insertions(+), 1 deletion(-)
 create mode 100644 test/Transforms/SCCP/2009-05-27-VectorOperandZero.ll

diff --git a/lib/Transforms/Scalar/SCCP.cpp b/lib/Transforms/Scalar/SCCP.cpp
index d2a70ea9d00..d73519c04e3 100644
--- a/lib/Transforms/Scalar/SCCP.cpp
+++ b/lib/Transforms/Scalar/SCCP.cpp
@@ -1196,7 +1196,7 @@ CallOverdefined:
      
       // If we can constant fold this, mark the result of the call as a
       // constant.
-      if (Constant *C = ConstantFoldCall(F, &Operands[0], Operands.size())) {
+      if (Constant *C = ConstantFoldCall(F, Operands.data(), Operands.size())) {
         markConstant(I, C);
         return;
       }
diff --git a/test/Transforms/SCCP/2009-05-27-VectorOperandZero.ll b/test/Transforms/SCCP/2009-05-27-VectorOperandZero.ll
new file mode 100644
index 00000000000..480aca0d1ac
--- /dev/null
+++ b/test/Transforms/SCCP/2009-05-27-VectorOperandZero.ll
@@ -0,0 +1,10 @@
+; RUN: llvm-as < %s | opt -sccp -disable-output
+; PR4277
+
+define i32 @main() nounwind {
+entry:
+	%0 = tail call signext i8 (...)* @sin() nounwind
+	ret i32 0
+}
+
+declare signext i8 @sin(...)