1 // RUN: %clang_cc1 -triple i386-unknown-unknown -emit-llvm -disable-llvm-passes -Os -o - %s | FileCheck %s
2 // RUN: %clang_cc1 -triple i386-unknown-unknown -emit-llvm -disable-llvm-passes -Os -std=c99 -o - %s | FileCheck %s
3 // RUN: %clang_cc1 -triple x86_64-unknown-unknown -emit-llvm -disable-llvm-passes -Os -std=c99 -o - %s | FileCheck %s
4 // CHECK: define signext i8 @f0(i32 %x) [[NUW:#[0-9]+]]
5 // CHECK: define zeroext i8 @f1(i32 %x) [[NUW]]
6 // CHECK: define void @f2(i8 signext %x) [[NUW]]
7 // CHECK: define void @f3(i8 zeroext %x) [[NUW]]
8 // CHECK: define signext i16 @f4(i32 %x) [[NUW]]
9 // CHECK: define zeroext i16 @f5(i32 %x) [[NUW]]
10 // CHECK: define void @f6(i16 signext %x) [[NUW]]
11 // CHECK: define void @f7(i16 zeroext %x) [[NUW]]
12 
13 signed char f0(int x) { return x; }
14 
15 unsigned char f1(int x) { return x; }
16 
17 void f2(signed char x) { }
18 
19 void f3(unsigned char x) { }
20 
21 signed short f4(int x) { return x; }
22 
23 unsigned short f5(int x) { return x; }
24 
25 void f6(signed short x) { }
26 
27 void f7(unsigned short x) { }
28 
29 // CHECK-LABEL: define void @f8()
30 // CHECK: [[AI:#[0-9]+]]
31 // CHECK: {
32 void __attribute__((always_inline)) f8(void) { }
33 
34 // CHECK: call void @f9_t()
35 // CHECK: [[NR:#[0-9]+]]
36 // CHECK: }
37 void __attribute__((noreturn)) f9_t(void);
38 void f9(void) { f9_t(); }
39 
40 // CHECK: call void @f9a()
41 // CHECK: [[NR]]
42 // CHECK: }
43 _Noreturn void f9a(void);
44 void f9b(void) { f9a(); }
45 
46 // FIXME: We should be setting nounwind on calls.
47 // CHECK: call i32 @f10_t()
48 // CHECK: [[NUW_RN:#[0-9]+]]
49 // CHECK: {
50 int __attribute__((const)) f10_t(void);
51 int f10(void) { return f10_t(); }
52 int f11(void) {
53  exit:
54   return f10_t();
55 }
56 int f12(int arg) {
57   return arg ? 0 : f10_t();
58 }
59 
60 // CHECK: define void @f13() [[NUW_OS_RN:#[0-9]+]]
61 void f13(void) __attribute__((pure)) __attribute__((const));
62 void f13(void){}
63 
64 
65 // <rdar://problem/7102668> [irgen] clang isn't setting the optsize bit on functions
66 // CHECK-LABEL: define void @f15
67 // CHECK: [[NUW]]
68 // CHECK: {
69 void f15(void) {
70 }
71 
72 // PR5254
73 // CHECK-LABEL: define void @f16
74 // CHECK: [[SR:#[0-9]+]]
75 // CHECK: {
76 void __attribute__((force_align_arg_pointer)) f16(void) {
77 }
78 
79 // PR11038
80 // CHECK-LABEL: define void @f18()
81 // CHECK: [[RT:#[0-9]+]]
82 // CHECK: {
83 // CHECK: call void @f17()
84 // CHECK: [[RT_CALL:#[0-9]+]]
85 // CHECK: ret void
86 __attribute__ ((returns_twice)) void f17(void);
87 __attribute__ ((returns_twice)) void f18(void) {
88         f17();
89 }
90 
91 // CHECK-LABEL: define void @f19()
92 // CHECK: {
93 // CHECK: call i32 @setjmp(i32* null)
94 // CHECK: [[RT_CALL]]
95 // CHECK: ret void
96 typedef int jmp_buf[((9 * 2) + 3 + 16)];
97 int setjmp(jmp_buf);
98 void f19(void) {
99   setjmp(0);
100 }
101 
102 // CHECK-LABEL: define void @f20()
103 // CHECK: {
104 // CHECK: call i32 @_setjmp(i32* null)
105 // CHECK: [[RT_CALL]]
106 // CHECK: ret void
107 int _setjmp(jmp_buf);
108 void f20(void) {
109   _setjmp(0);
110 }
111 
112 // CHECK: attributes [[NUW]] = { nounwind optsize{{.*}} }
113 // CHECK: attributes [[AI]] = { alwaysinline nounwind optsize{{.*}} }
114 // CHECK: attributes [[NUW_OS_RN]] = { nounwind optsize readnone{{.*}} }
115 // CHECK: attributes [[SR]] = { nounwind optsize{{.*}} "stackrealign"{{.*}} }
116 // CHECK: attributes [[RT]] = { nounwind optsize returns_twice{{.*}} }
117 // CHECK: attributes [[NR]] = { noreturn optsize }
118 // CHECK: attributes [[NUW_RN]] = { nounwind optsize readnone }
119 // CHECK: attributes [[RT_CALL]] = { optsize returns_twice }
120