xref: /llvm-project/clang/test/CodeGenCXX/auto-var-init-max-size.cpp (revision 0cf1e662b13fb20d3897c5b9055c60b0de50beca)
1 // Pattern related max size tests: 1, 1024, 4096
2 // RUN: %clang_cc1 -triple x86_64-unknown-unknown -ftrivial-auto-var-init=pattern -ftrivial-auto-var-init-max-size=1 %s -emit-llvm -o - | FileCheck -check-prefix=PATTERN-COMMON -check-prefix=PATTERN-MAX-1 %s
3 // RUN: %clang_cc1 -triple x86_64-unknown-unknown -ftrivial-auto-var-init=pattern -ftrivial-auto-var-init-max-size=1024 %s -emit-llvm -o - | FileCheck -check-prefix=PATTERN-COMMON -check-prefix=PATTERN-MAX-1024 %s
4 // RUN: %clang_cc1 -triple x86_64-unknown-unknown -ftrivial-auto-var-init=pattern -ftrivial-auto-var-init-max-size=4096 %s -emit-llvm -o - | FileCheck -check-prefix=PATTERN-COMMON -check-prefix=PATTERN-MAX-4096 %s
5 //
6 // Zero related max size tests: 1, 1024, 4096
7 // RUN: %clang_cc1 -triple x86_64-unknown-unknown -ftrivial-auto-var-init=zero -ftrivial-auto-var-init-max-size=1 %s -emit-llvm -o - | FileCheck -check-prefix=ZERO-COMMON -check-prefix=ZERO-MAX-1 %s
8 // RUN: %clang_cc1 -triple x86_64-unknown-unknown -ftrivial-auto-var-init=zero -ftrivial-auto-var-init-max-size=1024 %s -emit-llvm -o - | FileCheck -check-prefix=ZERO-COMMON -check-prefix=ZERO-MAX-1024 %s
9 // RUN: %clang_cc1 -triple x86_64-unknown-unknown -ftrivial-auto-var-init=zero -ftrivial-auto-var-init-max-size=4096 %s -emit-llvm -o - | FileCheck -check-prefix=ZERO-COMMON -check-prefix=ZERO-MAX-4096 %s
10 
11 struct Foo {
12     int x; // we should try to make sure X is initialized.
13     char buff[1024];  // this one is fine to skip
14 };
15 
foo(unsigned n)16 int foo(unsigned n) {
17   bool var_size_1;
18   long var_size_8_init = 123;
19   long var_size_8_noinit;
20   long var_size_8_init_later;
21   void *var_size_8p;
22   int var_size_1024[256];
23   Foo var_size_1028;
24   int var_size_4096[1024];
25   // VLA, non-constant size
26   int var_vla[n];
27   // builtin, non-constant size
28   var_size_8p = __builtin_alloca(sizeof(unsigned long long) * n);
29   var_size_8_init_later = 456;
30   // There are 10 variables: var_size_1, var_size_8_init, var_size_8_noinit,
31   // var_size_8_init_later, var_size_8p, var_size_1024,
32   // var_size_1028, var_size_4096, var_vla, and a builtin anonymous var ("%5").
33   // - Doesn't need auto-init: var_size_8_init
34   // - COMMON (auto-init regardless of the max size): "var_vla", and "%5"
35   // - Max size 1: "var_size_1"
36   // - Max size 1024: "var_size_1", "var_size_8_noinit", "var_size_8_init_later", "var_size_8p", "var_size_1024"
37   // - Max size 4096: "var_size_1", "var_size_8_noinit", "var_size_8_init_later", "var_size_8p", "var_size_1024",
38   //                  "var_size_1028", "var_size_4096"
39   //
40   // PATTERN-MAX-1: store i8 -86, ptr %var_size_1, align 1, !annotation [[AUTO_INIT:!.+]]
41   // PATTERN-MAX-1-NEXT: store i64 123, ptr %var_size_8_init, align 8
42   // PATTERN-MAX-1-NOT: store i64 -6148914691236517206, ptr %var_size_8_noinit, align 8, !annotation [[AUTO_INIT:!.+]]
43   // PATTERN-MAX-1-NOT: store i64 -6148914691236517206, ptr %var_size_8_init_later, align 8, !annotation [[AUTO_INIT:!.+]]
44   // PATTERN-MAX-1-NOT: store ptr inttoptr (i64 -6148914691236517206 to ptr), ptr %var_size_8p, align 8, !annotation [[AUTO_INIT:!.+]]
45   // PATTERN-MAX-1-NOT: call void @llvm.memset.p0.i64(ptr align 16 %var_size_1024, i8 -86, i64 1024, i1 false), !annotation [[AUTO_INIT:!.+]]
46   // PATTERN-MAX-1-NOT: call void @llvm.memset.p0.i64(ptr align 4 %var_size_1028, i8 -86, i64 1028, i1 false), !annotation [[AUTO_INIT:!.+]]
47   // PATTERN-MAX-1-NOT: call void @llvm.memset.p0.i64(ptr align 16 %var_size_4096, i8 -86, i64 4096, i1 false), !annotation [[AUTO_INIT:!.+]]
48 
49   // PATTERN-MAX-1024: store i8 -86, ptr %var_size_1, align 1, !annotation [[AUTO_INIT:!.+]]
50   // PATTERN-MAX-1024-NEXT: store i64 123, ptr %var_size_8_init, align 8
51   // PATTERN-MAX-1024: store i64 -6148914691236517206, ptr %var_size_8_noinit, align 8, !annotation [[AUTO_INIT:!.+]]
52   // PATTERN-MAX-1024: store i64 -6148914691236517206, ptr %var_size_8_init_later, align 8, !annotation [[AUTO_INIT:!.+]]
53   // PATTERN-MAX-1024: store ptr inttoptr (i64 -6148914691236517206 to ptr), ptr %var_size_8p, align 8, !annotation [[AUTO_INIT:!.+]]
54   // PATTERN-MAX-1024: call void @llvm.memset.p0.i64(ptr align 16 %var_size_1024, i8 -86, i64 1024, i1 false), !annotation [[AUTO_INIT:!.+]]
55   // PATTERN-MAX-1024-NOT: call void @llvm.memset.p0.i64(ptr align 4 %var_size_1028, i8 -86, i64 1028, i1 false), !annotation [[AUTO_INIT:!.+]]
56   // PATTERN-MAX-1024-NOT: call void @llvm.memset.p0.i64(ptr align 16 %var_size_4096, i8 -86, i64 4096, i1 false), !annotation [[AUTO_INIT:!.+]]
57 
58   // PATTERN-MAX-4096: store i8 -86, ptr %var_size_1, align 1, !annotation [[AUTO_INIT:!.+]]
59   // PATTERN-MAX-4096-NEXT: store i64 123, ptr %var_size_8_init, align 8
60   // PATTERN-MAX-4096: store i64 -6148914691236517206, ptr %var_size_8_noinit, align 8, !annotation [[AUTO_INIT:!.+]]
61   // PATTERN-MAX-4096: store i64 -6148914691236517206, ptr %var_size_8_init_later, align 8, !annotation [[AUTO_INIT:!.+]]
62   // PATTERN-MAX-4096: store ptr inttoptr (i64 -6148914691236517206 to ptr), ptr %var_size_8p, align 8, !annotation [[AUTO_INIT:!.+]]
63   // PATTERN-MAX-4096: call void @llvm.memset.p0.i64(ptr align 16 %var_size_1024, i8 -86, i64 1024, i1 false), !annotation [[AUTO_INIT:!.+]]
64   // PATTERN-MAX-4096: call void @llvm.memset.p0.i64(ptr align 4 %var_size_1028, i8 -86, i64 1028, i1 false), !annotation [[AUTO_INIT:!.+]]
65   // PATTERN-MAX-4096: call void @llvm.memset.p0.i64(ptr align 16 %var_size_4096, i8 -86, i64 4096, i1 false), !annotation [[AUTO_INIT:!.+]]
66 
67   // PATTERN-COMMON: call void @llvm.memcpy.p0.p0.i64(ptr align 4 %vla.cur, ptr align 4 @__const._Z3fooj.var_vla, i64 4, i1 false), !annotation [[AUTO_INIT:!.+]]
68   // PATTERN-COMMON: call void @llvm.memset.p0.i64(ptr align 16 %5, i8 -86, i64 %mul, i1 false), !annotation [[AUTO_INIT:!.+]]
69 
70   // ZERO-MAX-1: store i8 0, ptr %var_size_1, align 1, !annotation [[AUTO_INIT:!.+]]
71   // ZERO-MAX-1-NEXT: store i64 123, ptr %var_size_8_init, align 8
72   // ZERO-MAX-1-NOT: store i64 0, ptr %var_size_8_noinit, align 8, !annotation [[AUTO_INIT:!.+]]
73   // ZERO-MAX-1-NOT: store i64 0, ptr %var_size_8_init_later, align 8, !annotation [[AUTO_INIT:!.+]]
74   // ZERO-MAX-1-NOT: store ptr null, ptr %var_size_8p, align 8, !annotation [[AUTO_INIT:!.+]]
75   // ZERO-MAX-1-NOT: call void @llvm.memset.p0.i64(ptr align 16 %var_size_1024, i8 0, i64 1024, i1 false), !annotation [[AUTO_INIT:!.+]]
76   // ZERO-MAX-1-NOT: call void @llvm.memset.p0.i64(ptr align 4 %var_size_1028, i8 0, i64 1028, i1 false), !annotation [[AUTO_INIT:!.+]]
77   // ZERO-MAX-1-NOT: call void @llvm.memset.p0.i64(ptr align 16 %var_size_4096, i8 0, i64 4096, i1 false), !annotation [[AUTO_INIT:!.+]]
78 
79   // ZERO-MAX-1024: store i8 0, ptr %var_size_1, align 1, !annotation [[AUTO_INIT:!.+]]
80   // ZERO-MAX-1024-NEXT: store i64 123, ptr %var_size_8_init, align 8
81   // ZERO-MAX-1024: store i64 0, ptr %var_size_8_noinit, align 8, !annotation [[AUTO_INIT:!.+]]
82   // ZERO-MAX-1024: store i64 0, ptr %var_size_8_init_later, align 8, !annotation [[AUTO_INIT:!.+]]
83   // ZERO-MAX-1024: store ptr null, ptr %var_size_8p, align 8, !annotation [[AUTO_INIT:!.+]]
84   // ZERO-MAX-1024: call void @llvm.memset.p0.i64(ptr align 16 %var_size_1024, i8 0, i64 1024, i1 false), !annotation [[AUTO_INIT:!.+]]
85   // ZERO-MAX-1024-NOT: call void @llvm.memset.p0.i64(ptr align 4 %var_size_1028, i8 0, i64 1028, i1 false), !annotation [[AUTO_INIT:!.+]]
86   // ZERO-MAX-1024-NOT: call void @llvm.memset.p0.i64(ptr align 16 %var_size_4096, i8 0, i64 4096, i1 false), !annotation [[AUTO_INIT:!.+]]
87 
88   // ZERO-MAX-4096: store i8 0, ptr %var_size_1, align 1, !annotation [[AUTO_INIT:!.+]]
89   // ZERO-MAX-4096-NEXT: store i64 123, ptr %var_size_8_init, align 8
90   // ZERO-MAX-4096: store i64 0, ptr %var_size_8_noinit, align 8, !annotation [[AUTO_INIT:!.+]]
91   // ZERO-MAX-4096: store i64 0, ptr %var_size_8_init_later, align 8, !annotation [[AUTO_INIT:!.+]]
92   // ZERO-MAX-4096: store ptr null, ptr %var_size_8p, align 8, !annotation [[AUTO_INIT:!.+]]
93   // ZERO-MAX-4096: call void @llvm.memset.p0.i64(ptr align 16 %var_size_1024, i8 0, i64 1024, i1 false), !annotation [[AUTO_INIT:!.+]]
94   // ZERO-MAX-4096: call void @llvm.memset.p0.i64(ptr align 4 %var_size_1028, i8 0, i64 1028, i1 false), !annotation [[AUTO_INIT:!.+]]
95   // ZERO-MAX-4096: call void @llvm.memset.p0.i64(ptr align 16 %var_size_4096, i8 0, i64 4096, i1 false), !annotation [[AUTO_INIT:!.+]]
96 
97   // ZERO-COMMON: call void @llvm.memset.p0.i64(ptr align 16 %vla, i8 0, i64 %3, i1 false), !annotation [[AUTO_INIT:!.+]]
98   // ZERO-COMMON: call void @llvm.memset.p0.i64(ptr align 16 %5, i8 0, i64 %mul, i1 false), !annotation [[AUTO_INIT:!.+]]
99 
100   return 0;
101 }
102