test/CodeGen/function-attributes.c

   1 // RUN: clang-cc -triple i386-unknown-unknown -emit-llvm -o %t %s &&
   2 // RUN: grep 'define signext i8 @f0(i32 %x) nounwind' %t &&
   3 // RUN: grep 'define zeroext i8 @f1(i32 %x) nounwind' %t &&
   4 // RUN: grep 'define void @f2(i8 signext %x) nounwind' %t &&
   5 // RUN: grep 'define void @f3(i8 zeroext %x) nounwind' %t &&
   6 // RUN: grep 'define signext i16 @f4(i32 %x) nounwind' %t &&
   7 // RUN: grep 'define zeroext i16 @f5(i32 %x) nounwind' %t &&
   8 // RUN: grep 'define void @f6(i16 signext %x) nounwind' %t &&
   9 // RUN: grep 'define void @f7(i16 zeroext %x) nounwind' %t &&
  10
  11 signed char f0(int x) { return x; }
  12
  13 unsigned char f1(int x) { return x; }
  14
  15 void f2(signed char x) { }
  16
  17 void f3(unsigned char x) { }
  18
  19 signed short f4(int x) { return x; }
  20
  21 unsigned short f5(int x) { return x; }
  22
  23 void f6(signed short x) { }
  24
  25 void f7(unsigned short x) { }
  26
  27 // RUN: grep 'define void @f8() nounwind alwaysinline' %t &&
  28 void __attribute__((always_inline)) f8(void) { }
  29
  30 // RUN: grep 'call void @f9_t() noreturn' %t &&
  31 void __attribute__((noreturn)) f9_t(void);
  32 void f9(void) { f9_t(); }
  33
  34 // FIXME: We should be setting nounwind on calls.
  35 // RUN: grep 'call i32 @f10_t() readnone' %t &&
  36 int __attribute__((const)) f10_t(void);
  37 int f10(void) { return f10_t(); }
  38 int f11(void) {
  39  exit:
  40   return f10_t();
  41 }
  42 int f12(int arg) {
  43   return arg ? 0 : f10_t();
  44 }
  45
  46 // RUN: grep 'define void @f13() nounwind readnone' %t &&
  47 void f13(void) __attribute__((pure)) __attribute__((const));
  48 void f13(void){}
  49
  50
  51 // Ensure that these get inlined: rdar://6853279
  52 // RUN: not grep '@ai_' %t &&
  53 static __inline__ __attribute__((always_inline))
  54 int ai_1() {  return 4; }
  55
  56 static __inline__ __attribute__((always_inline))
  57 struct {
  58   int a, b, c, d, e;
  59 } ai_2() { }
  60
  61
  62 int foo() {
  63   ai_2();
  64   return ai_1();
  65 }
  66
  67
  68
  69 // RUN: true