clang/test/CodeGenCXX/optnone-and-attributes.cpp

   1 // RUN: %clang_cc1 < %s -triple i386-mingw32 -fms-extensions -emit-llvm -x c++ | FileCheck %s
   2
   3 // optnone wins over inlinehint.
   4 // Test that both func1 and func2 are marked optnone and noinline.
   5
   6 // Definition with both optnone and inlinehint.
   7 __attribute__((optnone))
   8 inline int func1(int a) {
   9   return a + a + a + a;
  10 }
  11 // CHECK: @_Z5func1i({{.*}}) [[OPTNONE:#[0-9]+]]
  12
  13 // optnone declaration, inlinehint definition.
  14 __attribute__((optnone))
  15 int func2(int a);
  16
  17 inline int func2(int a) {
  18   return a + a + a + a;
  19 }
  20 // CHECK: @_Z5func2i({{.*}}) [[OPTNONE]]
  21
  22 // Keep alive the definitions of func1 and func2.
  23 int foo() {
  24   int val = func1(1);
  25   return val + func2(2);
  26 }
  27
  28 // optnone wins over minsize.
  29 __attribute__((optnone))
  30 int func3(int a);
  31
  32 __attribute__((minsize))
  33 int func3(int a) {
  34   return a + a + a + a;
  35 }
  36 // Same attribute set as everything else, therefore no 'minsize'.
  37 // CHECK: @_Z5func3i({{.*}}) [[OPTNONE]]
  38
  39
  40 // Verify that noreturn is compatible with optnone.
  41 __attribute__((noreturn))
  42 extern void exit_from_function();
  43
  44 __attribute__((noreturn)) __attribute((optnone))
  45 extern void noreturn_function(int a) { exit_from_function(); }
  46 // CHECK: @_Z17noreturn_functioni({{.*}}) [[NORETURN:#[0-9]+]]
  47
  48
  49 // Verify that __declspec(noinline) is compatible with optnone.
  50 __declspec(noinline) __attribute__((optnone))
  51 void func4() { return; }
  52 // CHECK: @_Z5func4v() [[OPTNONE]]
  53
  54 __declspec(noinline)
  55 extern void func5();
  56
  57 __attribute__((optnone))
  58 void func5() { return; }
  59 // CHECK: @_Z5func5v() [[OPTNONE]]
  60
  61
  62 // Verify also that optnone can be used on dllexport functions.
  63 // Adding attribute optnone on a dllimport function has no effect.
  64
  65 __attribute__((dllimport))
  66 __attribute__((optnone))
  67 int imported_optnone_func(int a);
  68
  69 __attribute__((dllexport))
  70 __attribute__((optnone))
  71 int exported_optnone_func(int a) {
  72   return imported_optnone_func(a); // use of imported func
  73 }
  74 // CHECK: @_Z21exported_optnone_funci({{.*}}) [[OPTNONE]]
  75 // CHECK: declare dllimport {{.*}} @_Z21imported_optnone_funci({{.*}}) [[DLLIMPORT:#[0-9]+]]
  76
  77
  78 // CHECK: attributes [[OPTNONE]] = { mustprogress noinline {{.*}} optnone
  79 // CHECK: attributes [[NORETURN]] = { mustprogress noinline noreturn {{.*}} optnone
  80
  81 // CHECK: attributes [[DLLIMPORT]] =
  82 // CHECK-NOT: optnone