xref: /minix3/external/bsd/llvm/dist/clang/test/CodeGen/function-attributes.c (revision 0a6a1f1d05b60e214de2f05a7310ddd1f0e590e7)
1f4a2713aSLionel Sambuc // RUN: %clang_cc1 -triple i386-unknown-unknown -emit-llvm -Os -o - %s | FileCheck %s
2*0a6a1f1dSLionel Sambuc // RUN: %clang_cc1 -triple i386-unknown-unknown -emit-llvm -Os -std=c99 -o - %s | FileCheck %s
3f4a2713aSLionel Sambuc // CHECK: define signext i8 @f0(i32 %x) [[NUW:#[0-9]+]]
4f4a2713aSLionel Sambuc // CHECK: define zeroext i8 @f1(i32 %x) [[NUW]]
5f4a2713aSLionel Sambuc // CHECK: define void @f2(i8 signext %x) [[NUW]]
6f4a2713aSLionel Sambuc // CHECK: define void @f3(i8 zeroext %x) [[NUW]]
7f4a2713aSLionel Sambuc // CHECK: define signext i16 @f4(i32 %x) [[NUW]]
8f4a2713aSLionel Sambuc // CHECK: define zeroext i16 @f5(i32 %x) [[NUW]]
9f4a2713aSLionel Sambuc // CHECK: define void @f6(i16 signext %x) [[NUW]]
10f4a2713aSLionel Sambuc // CHECK: define void @f7(i16 zeroext %x) [[NUW]]
11f4a2713aSLionel Sambuc 
f0(int x)12f4a2713aSLionel Sambuc signed char f0(int x) { return x; }
13f4a2713aSLionel Sambuc 
f1(int x)14f4a2713aSLionel Sambuc unsigned char f1(int x) { return x; }
15f4a2713aSLionel Sambuc 
f2(signed char x)16f4a2713aSLionel Sambuc void f2(signed char x) { }
17f4a2713aSLionel Sambuc 
f3(unsigned char x)18f4a2713aSLionel Sambuc void f3(unsigned char x) { }
19f4a2713aSLionel Sambuc 
f4(int x)20f4a2713aSLionel Sambuc signed short f4(int x) { return x; }
21f4a2713aSLionel Sambuc 
f5(int x)22f4a2713aSLionel Sambuc unsigned short f5(int x) { return x; }
23f4a2713aSLionel Sambuc 
f6(signed short x)24f4a2713aSLionel Sambuc void f6(signed short x) { }
25f4a2713aSLionel Sambuc 
f7(unsigned short x)26f4a2713aSLionel Sambuc void f7(unsigned short x) { }
27f4a2713aSLionel Sambuc 
28f4a2713aSLionel Sambuc // CHECK-LABEL: define void @f8()
29f4a2713aSLionel Sambuc // CHECK: [[AI:#[0-9]+]]
30f4a2713aSLionel Sambuc // CHECK: {
f8(void)31f4a2713aSLionel Sambuc void __attribute__((always_inline)) f8(void) { }
32f4a2713aSLionel Sambuc 
33f4a2713aSLionel Sambuc // CHECK: call void @f9_t()
34f4a2713aSLionel Sambuc // CHECK: [[NR:#[0-9]+]]
35f4a2713aSLionel Sambuc // CHECK: }
36f4a2713aSLionel Sambuc void __attribute__((noreturn)) f9_t(void);
f9(void)37f4a2713aSLionel Sambuc void f9(void) { f9_t(); }
38f4a2713aSLionel Sambuc 
39f4a2713aSLionel Sambuc // CHECK: call void @f9a()
40f4a2713aSLionel Sambuc // CHECK: [[NR]]
41f4a2713aSLionel Sambuc // CHECK: }
42f4a2713aSLionel Sambuc _Noreturn void f9a(void);
f9b(void)43f4a2713aSLionel Sambuc void f9b(void) { f9a(); }
44f4a2713aSLionel Sambuc 
45f4a2713aSLionel Sambuc // FIXME: We should be setting nounwind on calls.
46f4a2713aSLionel Sambuc // CHECK: call i32 @f10_t()
47f4a2713aSLionel Sambuc // CHECK: [[NUW_RN:#[0-9]+]]
48f4a2713aSLionel Sambuc // CHECK: {
49f4a2713aSLionel Sambuc int __attribute__((const)) f10_t(void);
f10(void)50f4a2713aSLionel Sambuc int f10(void) { return f10_t(); }
f11(void)51f4a2713aSLionel Sambuc int f11(void) {
52f4a2713aSLionel Sambuc  exit:
53f4a2713aSLionel Sambuc   return f10_t();
54f4a2713aSLionel Sambuc }
f12(int arg)55f4a2713aSLionel Sambuc int f12(int arg) {
56f4a2713aSLionel Sambuc   return arg ? 0 : f10_t();
57f4a2713aSLionel Sambuc }
58f4a2713aSLionel Sambuc 
59f4a2713aSLionel Sambuc // CHECK: define void @f13() [[NUW]]
60f4a2713aSLionel Sambuc void f13(void) __attribute__((pure)) __attribute__((const));
f13(void)61f4a2713aSLionel Sambuc void f13(void){}
62f4a2713aSLionel Sambuc 
63f4a2713aSLionel Sambuc 
64f4a2713aSLionel Sambuc // Ensure that these get inlined: rdar://6853279
65f4a2713aSLionel Sambuc // CHECK-LABEL: define void @f14
66f4a2713aSLionel Sambuc // CHECK-NOT: @ai_
67f4a2713aSLionel Sambuc // CHECK: call void @f14_end
68f4a2713aSLionel Sambuc static __inline__ __attribute__((always_inline))
ai_1()69f4a2713aSLionel Sambuc int ai_1() {  return 4; }
70f4a2713aSLionel Sambuc 
71f4a2713aSLionel Sambuc static __inline__ __attribute__((always_inline))
72f4a2713aSLionel Sambuc struct {
73f4a2713aSLionel Sambuc   int a, b, c, d, e;
ai_2()74f4a2713aSLionel Sambuc } ai_2() { while (1) {} }
75f4a2713aSLionel Sambuc 
f14(int a)76f4a2713aSLionel Sambuc void f14(int a) {
77f4a2713aSLionel Sambuc   extern void f14_end(void);
78f4a2713aSLionel Sambuc   if (a)
79f4a2713aSLionel Sambuc     ai_2();
80f4a2713aSLionel Sambuc   ai_1();
81f4a2713aSLionel Sambuc   f14_end();
82f4a2713aSLionel Sambuc }
83f4a2713aSLionel Sambuc 
84f4a2713aSLionel Sambuc // <rdar://problem/7102668> [irgen] clang isn't setting the optsize bit on functions
85f4a2713aSLionel Sambuc // CHECK-LABEL: define void @f15
86f4a2713aSLionel Sambuc // CHECK: [[NUW]]
87f4a2713aSLionel Sambuc // CHECK: {
f15(void)88f4a2713aSLionel Sambuc void f15(void) {
89f4a2713aSLionel Sambuc }
90f4a2713aSLionel Sambuc 
91f4a2713aSLionel Sambuc // PR5254
92f4a2713aSLionel Sambuc // CHECK-LABEL: define void @f16
93f4a2713aSLionel Sambuc // CHECK: [[ALIGN:#[0-9]+]]
94f4a2713aSLionel Sambuc // CHECK: {
f16(void)95f4a2713aSLionel Sambuc void __attribute__((force_align_arg_pointer)) f16(void) {
96f4a2713aSLionel Sambuc }
97f4a2713aSLionel Sambuc 
98f4a2713aSLionel Sambuc // PR11038
99f4a2713aSLionel Sambuc // CHECK-LABEL: define void @f18()
100f4a2713aSLionel Sambuc // CHECK: [[RT:#[0-9]+]]
101f4a2713aSLionel Sambuc // CHECK: {
102f4a2713aSLionel Sambuc // CHECK: call void @f17()
103f4a2713aSLionel Sambuc // CHECK: [[RT_CALL:#[0-9]+]]
104f4a2713aSLionel Sambuc // CHECK: ret void
105f4a2713aSLionel Sambuc __attribute__ ((returns_twice)) void f17(void);
f18(void)106f4a2713aSLionel Sambuc __attribute__ ((returns_twice)) void f18(void) {
107f4a2713aSLionel Sambuc         f17();
108f4a2713aSLionel Sambuc }
109f4a2713aSLionel Sambuc 
110f4a2713aSLionel Sambuc // CHECK-LABEL: define void @f19()
111f4a2713aSLionel Sambuc // CHECK: {
112f4a2713aSLionel Sambuc // CHECK: call i32 @setjmp(i32* null)
113f4a2713aSLionel Sambuc // CHECK: [[RT_CALL]]
114f4a2713aSLionel Sambuc // CHECK: ret void
115f4a2713aSLionel Sambuc typedef int jmp_buf[((9 * 2) + 3 + 16)];
116f4a2713aSLionel Sambuc int setjmp(jmp_buf);
f19(void)117f4a2713aSLionel Sambuc void f19(void) {
118f4a2713aSLionel Sambuc   setjmp(0);
119f4a2713aSLionel Sambuc }
120f4a2713aSLionel Sambuc 
121*0a6a1f1dSLionel Sambuc // CHECK-LABEL: define void @f20()
122*0a6a1f1dSLionel Sambuc // CHECK: {
123*0a6a1f1dSLionel Sambuc // CHECK: call i32 @_setjmp(i32* null)
124*0a6a1f1dSLionel Sambuc // CHECK: [[RT_CALL]]
125*0a6a1f1dSLionel Sambuc // CHECK: ret void
126*0a6a1f1dSLionel Sambuc int _setjmp(jmp_buf);
f20(void)127*0a6a1f1dSLionel Sambuc void f20(void) {
128*0a6a1f1dSLionel Sambuc   _setjmp(0);
129*0a6a1f1dSLionel Sambuc }
130*0a6a1f1dSLionel Sambuc 
131f4a2713aSLionel Sambuc // CHECK: attributes [[NUW]] = { nounwind optsize readnone{{.*}} }
132f4a2713aSLionel Sambuc // CHECK: attributes [[AI]] = { alwaysinline nounwind optsize readnone{{.*}} }
133f4a2713aSLionel Sambuc // CHECK: attributes [[ALIGN]] = { nounwind optsize readnone alignstack=16{{.*}} }
134f4a2713aSLionel Sambuc // CHECK: attributes [[RT]] = { nounwind optsize returns_twice{{.*}} }
135f4a2713aSLionel Sambuc // CHECK: attributes [[NR]] = { noreturn nounwind optsize }
136f4a2713aSLionel Sambuc // CHECK: attributes [[NUW_RN]] = { nounwind optsize readnone }
137f4a2713aSLionel Sambuc // CHECK: attributes [[RT_CALL]] = { nounwind optsize returns_twice }
138