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llvm/clang/test/CodeGen/convergent-functions.cpp 

// RUN: %clang_cc1 -triple i386-pc-win32 -emit-llvm -fconvergent-functions -o - < %s | FileCheck -check-prefixes=CHECK,CONVFUNC %s
// RUN: %clang_cc1 -triple i386-pc-win32 -emit-llvm -o - < %s | FileCheck -check-prefixes=CHECK,NOCONVFUNC %s

// Test that the -fconvergent-functions flag works

// CHECK: attributes #0 = {
// NOCONVFUNC-NOT: convergent
// CONVFUNC-SAME: convergent
// CHECK-SAME: }
void func(void) { }