clang/test/CodeGen/attr-no-tail.c

   1 // RUN: %clang_cc1 -triple x86_64-apple-macosx10.7.0 %s -emit-llvm -o - | FileCheck %s
   2
   3 // CHECK: %{{[a-z0-9]+}} = notail call i32 @callee0(i32 noundef %
   4 // CHECK: %{{[a-z0-9]+}} = notail call i32 @callee1(i32 noundef %
   5
   6 // Check that indirect calls do not have the notail marker.
   7 // CHECK: store ptr @callee1, ptr [[ALLOCA1:%[A-Za-z0-9]+]], align 8
   8 // CHECK: [[INDIRFUNC:%[0-9]+]] = load ptr, ptr [[ALLOCA1]], align 8
   9 // CHECK: %{{[a-z0-9]+}} = call i32 [[INDIRFUNC]](i32 noundef %{{[0-9]+}}
  10
  11 // CHECK: %{{[a-z0-9]+}} = call i32 @callee2(i32 noundef %
  12
  13 int callee0(int a) __attribute__((not_tail_called)) {
  14   return a + 1;
  15 }
  16
  17 int callee1(int) __attribute__((not_tail_called));
  18
  19 int callee2(int);
  20
  21 typedef int (*FuncTy)(int);
  22
  23 int foo0(int a) {
  24   if (a > 1)
  25     return callee0(a);
  26   if (a == 1)
  27     return callee1(a);
  28   if (a < 0) {
  29     FuncTy F = callee1;
  30     return (*F)(a);
  31   }
  32   return callee2(a);
  33 }