21 lines
876 B
C
21 lines
876 B
C
// RUN: %clang_cc1 -emit-llvm -triple x86_64-unknown-linux-gnu -O2 -o - %s | FileCheck -check-prefix=NULL-POINTER-INVALID %s
|
|
// RUN: %clang_cc1 -emit-llvm -triple x86_64-unknown-linux-gnu -O2 -o - %s -fno-delete-null-pointer-checks | FileCheck -check-prefix=NULL-POINTER-VALID %s
|
|
|
|
// Test that clang does not remove the null pointer check with
|
|
// -fno-delete-null-pointer-checks.
|
|
int null_check(int *P) {
|
|
// NULL-POINTER-VALID: %[[TOBOOL:.*]] = icmp eq i32* %P, null
|
|
// NULL-POINTER-INVALID-NOT: icmp eq
|
|
// NULL-POINTER-VALID: %[[SEL:.*]] = select i1 %[[TOBOOL:.*]], i32* null, i32*
|
|
// NULL-POINTER-INVALID-NOT: select i1
|
|
// NULL-POINTER-VALID: load i32, i32* %[[SEL:.*]]
|
|
int *Q = P;
|
|
if (P) {
|
|
Q = P + 2;
|
|
}
|
|
return *Q;
|
|
}
|
|
|
|
// NULL-POINTER-INVALID-NOT: attributes #0 = {{.*}} null_pointer_is_valid
|
|
// NULL-POINTER-VALID: attributes #0 = {{.*}} null_pointer_is_valid
|