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llvm-project/clang/test/CodeGenOpenCL/amdgpu-nullptr.cl
Yaxun Liu 8f66b4b44a Add support for non-zero null pointer for C and OpenCL 
In amdgcn target, null pointers in global, constant, and generic address space take value 0 but null pointers in private and local address space take value -1. Currently LLVM assumes all null pointers take value 0, which results in incorrectly translated IR. To workaround this issue, instead of emit null pointers in local and private address space, a null pointer in generic address space is emitted and casted to local and private address space.

Tentative definition of global variables with non-zero initializer will have weak linkage instead of common linkage since common linkage requires zero initializer and does not have explicit section to hold the non-zero value.

Virtual member functions getNullPointer and performAddrSpaceCast are added to TargetCodeGenInfo which by default returns ConstantPointerNull and emitting addrspacecast instruction. A virtual member function getNullPointerValue is added to TargetInfo which by default returns 0. Each target can override these virtual functions to get target specific null pointer and the null pointer value for specific address space, and perform specific translations for addrspacecast.

Wrapper functions getNullPointer is added to CodegenModule and getTargetNullPointerValue is added to ASTContext to facilitate getting the target specific null pointers and their values.

This change has no effect on other targets except amdgcn target. Other targets can provide support of non-zero null pointer in a similar way.

This change only provides support for non-zero null pointer for C and OpenCL. Supporting for other languages will be added later incrementally.

Differential Revision: https://reviews.llvm.org/D26196

llvm-svn: 289252
2016-12-09 19:01:11 +00:00

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// RUN: %clang_cc1 %s -cl-std=CL2.0 -include opencl-c.h -triple amdgcn -emit-llvm -o - | FileCheck %s
// RUN: %clang_cc1 %s -O0 -cl-std=CL2.0 -include opencl-c.h -triple amdgcn -emit-llvm -o - | FileCheck --check-prefix=NOOPT %s
typedef struct {
private char *p1;
local char *p2;
constant char *p3;
global char *p4;
generic char *p5;
} StructTy1;
typedef struct {
constant char *p3;
global char *p4;
generic char *p5;
} StructTy2;
// LLVM requests global variable with common linkage to be initialized with zeroinitializer, therefore use -fno-common
// to suppress common linkage for tentative definition.
// Test 0 as initializer.
// CHECK: @private_p = local_unnamed_addr addrspace(1) global i8* addrspacecast (i8 addrspace(4)* null to i8*), align 4
private char *private_p = 0;
// CHECK: @local_p = local_unnamed_addr addrspace(1) global i8 addrspace(3)* addrspacecast (i8 addrspace(4)* null to i8 addrspace(3)*), align 4
local char *local_p = 0;
// CHECK: @global_p = local_unnamed_addr addrspace(1) global i8 addrspace(1)* null, align 4
global char *global_p = 0;
// CHECK: @constant_p = local_unnamed_addr addrspace(1) global i8 addrspace(2)* null, align 4
constant char *constant_p = 0;
// CHECK: @generic_p = local_unnamed_addr addrspace(1) global i8 addrspace(4)* null, align 4
generic char *generic_p = 0;
// Test NULL as initializer.
// CHECK: @private_p_NULL = local_unnamed_addr addrspace(1) global i8* addrspacecast (i8 addrspace(4)* null to i8*), align 4
private char *private_p_NULL = NULL;
// CHECK: @local_p_NULL = local_unnamed_addr addrspace(1) global i8 addrspace(3)* addrspacecast (i8 addrspace(4)* null to i8 addrspace(3)*), align 4
local char *local_p_NULL = NULL;
// CHECK: @global_p_NULL = local_unnamed_addr addrspace(1) global i8 addrspace(1)* null, align 4
global char *global_p_NULL = NULL;
// CHECK: @constant_p_NULL = local_unnamed_addr addrspace(1) global i8 addrspace(2)* null, align 4
constant char *constant_p_NULL = NULL;
// CHECK: @generic_p_NULL = local_unnamed_addr addrspace(1) global i8 addrspace(4)* null, align 4
generic char *generic_p_NULL = NULL;
// Test constant folding of null pointer.
// A null pointer should be folded to a null pointer in the target address space.
// CHECK: @fold_generic = local_unnamed_addr addrspace(1) global i32 addrspace(4)* null, align 4
generic int *fold_generic = (global int*)(generic float*)(private char*)0;
// CHECK: @fold_priv = local_unnamed_addr addrspace(1) global i16* addrspacecast (i16 addrspace(4)* null to i16*), align 4
private short *fold_priv = (private short*)(generic int*)(global void*)0;
// CHECK: @fold_priv_arith = local_unnamed_addr addrspace(1) global i8* inttoptr (i32 9 to i8*), align 4
private char *fold_priv_arith = (private char*)0 + 10;
// CHECK: @fold_int = local_unnamed_addr addrspace(1) global i32 13, align 4
int fold_int = (int)(private void*)(generic char*)(global int*)0 + 14;
// CHECK: @fold_int2 = local_unnamed_addr addrspace(1) global i32 12, align 4
int fold_int2 = (int) ((private void*)0 + 13);
// CHECK: @fold_int3 = local_unnamed_addr addrspace(1) global i32 -1, align 4
int fold_int3 = (int) ((private int*)0);
// CHECK: @fold_int4 = local_unnamed_addr addrspace(1) global i32 7, align 4
int fold_int4 = (int) &((private int*)0)[2];
// CHECK: @fold_int5 = local_unnamed_addr addrspace(1) global i32 3, align 4
int fold_int5 = (int) &((private StructTy1*)0)->p2;
// Test static variable initialization.
// NOOPT: @test_static_var.sp1 = internal addrspace(1) global i8* addrspacecast (i8 addrspace(4)* null to i8*), align 4
// NOOPT: @test_static_var.sp2 = internal addrspace(1) global i8* addrspacecast (i8 addrspace(4)* null to i8*), align 4
// NOOPT: @test_static_var.sp3 = internal addrspace(1) global i8* addrspacecast (i8 addrspace(4)* null to i8*), align 4
// NOOPT: @test_static_var.sp4 = internal addrspace(1) global i8* null, align 4
// NOOPT: @test_static_var.sp5 = internal addrspace(1) global i8* null, align 4
// NOOPT: @test_static_var.SS1 = internal addrspace(1) global %struct.StructTy1 { i8* addrspacecast (i8 addrspace(4)* null to i8*), i8 addrspace(3)* addrspacecast (i8 addrspace(4)* null to i8 addrspace(3)*), i8 addrspace(2)* null, i8 addrspace(1)* null, i8 addrspace(4)* null }, align 4
// NOOPT: @test_static_var.SS2 = internal addrspace(1) global %struct.StructTy2 zeroinitializer, align 4
void test_static_var(void) {
static private char *sp1 = 0;
static private char *sp2 = NULL;
static private char *sp3;
static private char *sp4 = (private char*)((void)0, 0);
const int x = 0;
static private char *sp5 = (private char*)x;
static StructTy1 SS1;
static StructTy2 SS2;
}
// Test function-scope variable initialization.
// NOOPT-LABEL: test_func_scope_var
// NOOPT: store i8* addrspacecast (i8 addrspace(4)* null to i8*), i8** %sp1, align 4
// NOOPT: store i8* addrspacecast (i8 addrspace(4)* null to i8*), i8** %sp2, align 4
// NOOPT: store i8* null, i8** %sp3, align 4
// NOOPT: store i8* null, i8** %sp4, align 4
// NOOPT: %[[SS1:.*]] = bitcast %struct.StructTy1* %SS1 to i8*
// NOOPT: call void @llvm.memcpy.p0i8.p2i8.i64(i8* %[[SS1]], i8 addrspace(2)* bitcast (%struct.StructTy1 addrspace(2)* @test_func_scope_var.SS1 to i8 addrspace(2)*), i64 32, i32 4, i1 false)
// NOOPT: %[[SS2:.*]] = bitcast %struct.StructTy2* %SS2 to i8*
// NOOPT: call void @llvm.memset.p0i8.i64(i8* %[[SS2]], i8 0, i64 24, i32 4, i1 false)
void test_func_scope_var(void) {
private char *sp1 = 0;
private char *sp2 = NULL;
private char *sp3 = (private char*)((void)0, 0);
const int x = 0;
private char *sp4 = (private char*)x;
StructTy1 SS1 = {0, 0, 0, 0, 0};
StructTy2 SS2 = {0, 0, 0};
}
// Test default initialization of pointers.
// Tentative definition of global variables with non-zero initializer
// cannot have common linkage since common linkage requires zero initialization
// and does not have explicit section.
// CHECK: @p1 = weak local_unnamed_addr addrspace(1) global i8* addrspacecast (i8 addrspace(4)* null to i8*), align 4
private char *p1;
// CHECK: @p2 = weak local_unnamed_addr addrspace(1) global i8 addrspace(3)* addrspacecast (i8 addrspace(4)* null to i8 addrspace(3)*), align 4
local char *p2;
// CHECK: @p3 = common local_unnamed_addr addrspace(1) global i8 addrspace(2)* null, align 4
constant char *p3;
// CHECK: @p4 = common local_unnamed_addr addrspace(1) global i8 addrspace(1)* null, align 4
global char *p4;
// CHECK: @p5 = common local_unnamed_addr addrspace(1) global i8 addrspace(4)* null, align 4
generic char *p5;
// Test default initialization of sturcture.
// CHECK: @S1 = weak local_unnamed_addr addrspace(1) global %struct.StructTy1 { i8* addrspacecast (i8 addrspace(4)* null to i8*), i8 addrspace(3)* addrspacecast (i8 addrspace(4)* null to i8 addrspace(3)*), i8 addrspace(2)* null, i8 addrspace(1)* null, i8 addrspace(4)* null }, align 4
StructTy1 S1;
// CHECK: @S2 = common local_unnamed_addr addrspace(1) global %struct.StructTy2 zeroinitializer, align 4
StructTy2 S2;
// Test default initialization of array.
// CHECK: @A1 = weak local_unnamed_addr addrspace(1) global [2 x %struct.StructTy1] [%struct.StructTy1 { i8* addrspacecast (i8 addrspace(4)* null to i8*), i8 addrspace(3)* addrspacecast (i8 addrspace(4)* null to i8 addrspace(3)*), i8 addrspace(2)* null, i8 addrspace(1)* null, i8 addrspace(4)* null }, %struct.StructTy1 { i8* addrspacecast (i8 addrspace(4)* null to i8*), i8 addrspace(3)* addrspacecast (i8 addrspace(4)* null to i8 addrspace(3)*), i8 addrspace(2)* null, i8 addrspace(1)* null, i8 addrspace(4)* null }], align 4
StructTy1 A1[2];
// CHECK: @A2 = common local_unnamed_addr addrspace(1) global [2 x %struct.StructTy2] zeroinitializer, align 4
StructTy2 A2[2];
// Test comparison with 0.
// CHECK-LABEL: cmp_private
// CHECK: icmp eq i8* %p, addrspacecast (i8 addrspace(4)* null to i8*)
void cmp_private(private char* p) {
if (p != 0)
*p = 0;
}
// CHECK-LABEL: cmp_local
// CHECK: icmp eq i8 addrspace(3)* %p, addrspacecast (i8 addrspace(4)* null to i8 addrspace(3)*)
void cmp_local(local char* p) {
if (p != 0)
*p = 0;
}
// CHECK-LABEL: cmp_global
// CHECK: icmp eq i8 addrspace(1)* %p, null
void cmp_global(global char* p) {
if (p != 0)
*p = 0;
}
// CHECK-LABEL: cmp_constant
// CHECK: icmp eq i8 addrspace(2)* %p, null
char cmp_constant(constant char* p) {
if (p != 0)
return *p;
else
return 0;
}
// CHECK-LABEL: cmp_generic
// CHECK: icmp eq i8 addrspace(4)* %p, null
void cmp_generic(generic char* p) {
if (p != 0)
*p = 0;
}
// Test comparison with NULL.
// CHECK-LABEL: cmp_NULL_private
// CHECK: icmp eq i8* %p, addrspacecast (i8 addrspace(4)* null to i8*)
void cmp_NULL_private(private char* p) {
if (p != NULL)
*p = 0;
}
// CHECK-LABEL: cmp_NULL_local
// CHECK: icmp eq i8 addrspace(3)* %p, addrspacecast (i8 addrspace(4)* null to i8 addrspace(3)*)
void cmp_NULL_local(local char* p) {
if (p != NULL)
*p = 0;
}
// CHECK-LABEL: cmp_NULL_global
// CHECK: icmp eq i8 addrspace(1)* %p, null
void cmp_NULL_global(global char* p) {
if (p != NULL)
*p = 0;
}
// CHECK-LABEL: cmp_NULL_constant
// CHECK: icmp eq i8 addrspace(2)* %p, null
char cmp_NULL_constant(constant char* p) {
if (p != NULL)
return *p;
else
return 0;
}
// CHECK-LABEL: cmp_NULL_generic
// CHECK: icmp eq i8 addrspace(4)* %p, null
void cmp_NULL_generic(generic char* p) {
if (p != NULL)
*p = 0;
}
// Test storage 0 as null pointer.
// CHECK-LABEL: test_storage_null_pointer
// CHECK: store i8* addrspacecast (i8 addrspace(4)* null to i8*), i8* addrspace(4)* %arg_private
// CHECK: store i8 addrspace(3)* addrspacecast (i8 addrspace(4)* null to i8 addrspace(3)*), i8 addrspace(3)* addrspace(4)* %arg_local
// CHECK: store i8 addrspace(1)* null, i8 addrspace(1)* addrspace(4)* %arg_global
// CHECK: store i8 addrspace(2)* null, i8 addrspace(2)* addrspace(4)* %arg_constant
// CHECK: store i8 addrspace(4)* null, i8 addrspace(4)* addrspace(4)* %arg_generic
void test_storage_null_pointer(private char** arg_private,
local char** arg_local,
global char** arg_global,
constant char** arg_constant,
generic char** arg_generic) {
*arg_private = 0;
*arg_local = 0;
*arg_global = 0;
*arg_constant = 0;
*arg_generic = 0;
}
// Test storage NULL as null pointer.
// CHECK-LABEL: test_storage_null_pointer_NULL
// CHECK: store i8* addrspacecast (i8 addrspace(4)* null to i8*), i8* addrspace(4)* %arg_private
// CHECK: store i8 addrspace(3)* addrspacecast (i8 addrspace(4)* null to i8 addrspace(3)*), i8 addrspace(3)* addrspace(4)* %arg_local
// CHECK: store i8 addrspace(1)* null, i8 addrspace(1)* addrspace(4)* %arg_global
// CHECK: store i8 addrspace(2)* null, i8 addrspace(2)* addrspace(4)* %arg_constant
// CHECK: store i8 addrspace(4)* null, i8 addrspace(4)* addrspace(4)* %arg_generic
void test_storage_null_pointer_NULL(private char** arg_private,
local char** arg_local,
global char** arg_global,
constant char** arg_constant,
generic char** arg_generic) {
*arg_private = NULL;
*arg_local = NULL;
*arg_global = NULL;
*arg_constant = NULL;
*arg_generic = NULL;
}
// Test pass null pointer to function as argument.
void test_pass_null_pointer_arg_calee(private char* arg_private,
local char* arg_local,
global char* arg_global,
constant char* arg_constant,
generic char* arg_generic);
// CHECK-LABEL: test_pass_null_pointer_arg
// CHECK: call void @test_pass_null_pointer_arg_calee(i8* addrspacecast (i8 addrspace(4)* null to i8*), i8 addrspace(3)* addrspacecast (i8 addrspace(4)* null to i8 addrspace(3)*), i8 addrspace(1)* null, i8 addrspace(2)* null, i8 addrspace(4)* null)
// CHECK: call void @test_pass_null_pointer_arg_calee(i8* addrspacecast (i8 addrspace(4)* null to i8*), i8 addrspace(3)* addrspacecast (i8 addrspace(4)* null to i8 addrspace(3)*), i8 addrspace(1)* null, i8 addrspace(2)* null, i8 addrspace(4)* null)
void test_pass_null_pointer_arg(void) {
test_pass_null_pointer_arg_calee(0, 0, 0, 0, 0);
test_pass_null_pointer_arg_calee(NULL, NULL, NULL, NULL, NULL);
}
// Test cast null pointer to size_t.
void test_cast_null_pointer_to_sizet_calee(size_t arg_private,
size_t arg_local,
size_t arg_global,
size_t arg_constant,
size_t arg_generic);
// CHECK-LABEL: test_cast_null_pointer_to_sizet
// CHECK: call void @test_cast_null_pointer_to_sizet_calee(i64 ptrtoint (i8* addrspacecast (i8 addrspace(4)* null to i8*) to i64), i64 ptrtoint (i8 addrspace(3)* addrspacecast (i8 addrspace(4)* null to i8 addrspace(3)*) to i64), i64 0, i64 0, i64 0)
// CHECK: call void @test_cast_null_pointer_to_sizet_calee(i64 ptrtoint (i8* addrspacecast (i8 addrspace(4)* null to i8*) to i64), i64 ptrtoint (i8 addrspace(3)* addrspacecast (i8 addrspace(4)* null to i8 addrspace(3)*) to i64), i64 0, i64 0, i64 0)
void test_cast_null_pointer_to_sizet(void) {
test_cast_null_pointer_to_sizet_calee((size_t)((private char*)0),
(size_t)((local char*)0),
(size_t)((global char*)0),
(size_t)((constant char*)0),
(size_t)((generic char*)0));
test_cast_null_pointer_to_sizet_calee((size_t)((private char*)NULL),
(size_t)((local char*)NULL),
(size_t)((global char*)NULL),
(size_t)((constant char*)0), // NULL cannot be casted to constant pointer since it is defined as a generic pointer
(size_t)((generic char*)NULL));
}
// Test comparision between null pointers.
#define TEST_EQ00(addr1, addr2) int test_eq00_##addr1##_##addr2(void) { return (addr1 char*)0 == (addr2 char*)0; }
#define TEST_EQ0N(addr1, addr2) int test_eq0N_##addr1##_##addr2(void) { return (addr1 char*)0 == (addr2 char*)NULL; }
#define TEST_EQN0(addr1, addr2) int test_eqN0_##addr1##_##addr2(void) { return (addr1 char*)NULL == (addr2 char*)0; }
#define TEST_EQNN(addr1, addr2) int test_eqNN_##addr1##_##addr2(void) { return (addr1 char*)0 == (addr2 char*)NULL; }
#define TEST_NE00(addr1, addr2) int test_ne00_##addr1##_##addr2(void) { return (addr1 char*)0 != (addr2 char*)0; }
#define TEST_NE0N(addr1, addr2) int test_ne0N_##addr1##_##addr2(void) { return (addr1 char*)0 != (addr2 char*)NULL; }
#define TEST_NEN0(addr1, addr2) int test_neN0_##addr1##_##addr2(void) { return (addr1 char*)NULL != (addr2 char*)0; }
#define TEST_NENN(addr1, addr2) int test_neNN_##addr1##_##addr2(void) { return (addr1 char*)0 != (addr2 char*)NULL; }
#define TEST(addr1, addr2) \
TEST_EQ00(addr1, addr2) \
TEST_EQ0N(addr1, addr2) \
TEST_EQN0(addr1, addr2) \
TEST_EQNN(addr1, addr2) \
TEST_NE00(addr1, addr2) \
TEST_NE0N(addr1, addr2) \
TEST_NEN0(addr1, addr2) \
TEST_NENN(addr1, addr2)
// CHECK-LABEL: test_eq00_generic_private
// CHECK: ret i32 1
// CHECK-LABEL: test_eq0N_generic_private
// CHECK: ret i32 1
// CHECK-LABEL: test_eqN0_generic_private
// CHECK: ret i32 1
// CHECK-LABEL: test_eqNN_generic_private
// CHECK: ret i32 1
// CHECK-LABEL: test_ne00_generic_private
// CHECK: ret i32 0
// CHECK-LABEL: test_ne0N_generic_private
// CHECK: ret i32 0
// CHECK-LABEL: test_neN0_generic_private
// CHECK: ret i32 0
// CHECK-LABEL: test_neNN_generic_private
// CHECK: ret i32 0
TEST(generic, private)
// CHECK-LABEL: test_eq00_generic_local
// CHECK: ret i32 1
// CHECK-LABEL: test_eq0N_generic_local
// CHECK: ret i32 1
// CHECK-LABEL: test_eqN0_generic_local
// CHECK: ret i32 1
// CHECK-LABEL: test_eqNN_generic_local
// CHECK: ret i32 1
// CHECK-LABEL: test_ne00_generic_local
// CHECK: ret i32 0
// CHECK-LABEL: test_ne0N_generic_local
// CHECK: ret i32 0
// CHECK-LABEL: test_neN0_generic_local
// CHECK: ret i32 0
// CHECK-LABEL: test_neNN_generic_local
// CHECK: ret i32 0
TEST(generic, local)
// CHECK-LABEL: test_eq00_generic_global
// CHECK: ret i32 1
// CHECK-LABEL: test_eq0N_generic_global
// CHECK: ret i32 1
// CHECK-LABEL: test_eqN0_generic_global
// CHECK: ret i32 1
// CHECK-LABEL: test_eqNN_generic_global
// CHECK: ret i32 1
// CHECK-LABEL: test_ne00_generic_global
// CHECK: ret i32 0
// CHECK-LABEL: test_ne0N_generic_global
// CHECK: ret i32 0
// CHECK-LABEL: test_neN0_generic_global
// CHECK: ret i32 0
// CHECK-LABEL: test_neNN_generic_global
// CHECK: ret i32 0
TEST(generic, global)
// CHECK-LABEL: test_eq00_generic_generic
// CHECK: ret i32 1
// CHECK-LABEL: test_eq0N_generic_generic
// CHECK: ret i32 1
// CHECK-LABEL: test_eqN0_generic_generic
// CHECK: ret i32 1
// CHECK-LABEL: test_eqNN_generic_generic
// CHECK: ret i32 1
// CHECK-LABEL: test_ne00_generic_generic
// CHECK: ret i32 0
// CHECK-LABEL: test_ne0N_generic_generic
// CHECK: ret i32 0
// CHECK-LABEL: test_neN0_generic_generic
// CHECK: ret i32 0
// CHECK-LABEL: test_neNN_generic_generic
// CHECK: ret i32 0
TEST(generic, generic)
// CHECK-LABEL: test_eq00_constant_constant
// CHECK: ret i32 1
TEST_EQ00(constant, constant)
// Test cast to bool.
// CHECK-LABEL: cast_bool_private
// CHECK: icmp eq i8* %p, addrspacecast (i8 addrspace(4)* null to i8*)
void cast_bool_private(private char* p) {
if (p)
*p = 0;
}
// CHECK-LABEL: cast_bool_local
// CHECK: icmp eq i8 addrspace(3)* %p, addrspacecast (i8 addrspace(4)* null to i8 addrspace(3)*)
void cast_bool_local(local char* p) {
if (p)
*p = 0;
}
// CHECK-LABEL: cast_bool_global
// CHECK: icmp eq i8 addrspace(1)* %p, null
void cast_bool_global(global char* p) {
if (p)
*p = 0;
}
// CHECK-LABEL: cast_bool_constant
// CHECK: icmp eq i8 addrspace(2)* %p, null
char cast_bool_constant(constant char* p) {
if (p)
return *p;
else
return 0;
}
// CHECK-LABEL: cast_bool_generic
// CHECK: icmp eq i8 addrspace(4)* %p, null
void cast_bool_generic(generic char* p) {
if (p)
*p = 0;
}
// Test initialize a struct using memset.
// For large structures which is mostly zero, clang generats llvm.memset for
// the zero part and store for non-zero members.
typedef struct {
long a, b, c, d;
private char *p;
} StructTy3;
// CHECK-LABEL: test_memset
// CHECK: call void @llvm.memset.p0i8.i64(i8* {{.*}}, i8 0, i64 32, i32 8, i1 false)
// CHECK: store i8* addrspacecast (i8 addrspace(4)* null to i8*), i8** {{.*}}
StructTy3 test_memset(void) {
StructTy3 S3 = {0, 0, 0, 0, 0};
return S3;
}
// Test casting literal 0 to pointer.
// A 0 literal casted to pointer should become a null pointer.
// CHECK-LABEL: test_cast_0_to_ptr
// CHECK: ret i32* addrspacecast (i32 addrspace(4)* null to i32*)
private int* test_cast_0_to_ptr(void) {
return (private int*)0;
}
// Test casting non-literal integer with 0 value to pointer.
// A non-literal integer expression with 0 value is casted to a pointer with
// zero value.
// CHECK-LABEL: test_cast_int_to_ptr1
// CHECK: ret i32* null
private int* test_cast_int_to_ptr1(void) {
return (private int*)((void)0, 0);
}
// CHECK-LABEL: test_cast_int_to_ptr2
// CHECK: ret i32* null
private int* test_cast_int_to_ptr2(void) {
int x = 0;
return (private int*)x;
}
// Test logical operations.
// CHECK-LABEL: test_not_nullptr
// CHECK: ret i32 1
int test_not_nullptr(void) {
return !(private char*)NULL;
}
// CHECK-LABEL: test_and_nullptr
// CHECK: ret i32 0
int test_and_nullptr(int a) {
return a && ((private char*)NULL);
}
// CHECK-LABEL: test_not_ptr
// CHECK: %[[lnot:.*]] = icmp eq i8* %p, addrspacecast (i8 addrspace(4)* null to i8*)
// CHECK: %[[lnot_ext:.*]] = zext i1 %[[lnot]] to i32
// CHECK: ret i32 %[[lnot_ext]]
int test_not_ptr(private char* p) {
return !p;
}
// CHECK-LABEL: test_and_ptr
// CHECK: %[[tobool:.*]] = icmp ne i8* %p1, addrspacecast (i8 addrspace(4)* null to i8*)
// CHECK: %[[tobool1:.*]] = icmp ne i8 addrspace(3)* %p2, addrspacecast (i8 addrspace(4)* null to i8 addrspace(3)*)
// CHECK: %[[res:.*]] = and i1 %[[tobool]], %[[tobool1]]
// CHECK: %[[land_ext:.*]] = zext i1 %[[res]] to i32
// CHECK: ret i32 %[[land_ext]]
int test_and_ptr(private char* p1, local char* p2) {
return p1 && p2;
}
// Test folding of null pointer in function scope.
// NOOPT-LABEL: test_fold
// NOOPT: call void @test_fold_callee
// NOOPT: store i32 addrspace(1)* null, i32 addrspace(1)** %glob, align 4
// NOOPT: %{{.*}} = sub i64 %{{.*}}, 0
// NOOPT: call void @test_fold_callee
// NOOPT: %{{.*}} = add nsw i64 %{{.*}}, sext (i32 ptrtoint (i32* addrspacecast (i32 addrspace(4)* null to i32*) to i32) to i64)
// NOOPT: %{{.*}} = sub nsw i64 %{{.*}}, 1
void test_fold_callee(void);
void test_fold(void) {
global int* glob = (test_fold_callee(), (global int*)(generic char*)0);
long x = glob - (global int*)(generic char*)0;
x = x + (int)(test_fold_callee(), (private int*)(generic char*)(global short*)0);
x = x - (int)((private int*)0 == (private int*)(generic char*)0);
}
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