diff options
Diffstat (limited to 'clang/test/CodeGen/delete-null-pointer-checks.c')
| -rw-r--r-- | clang/test/CodeGen/delete-null-pointer-checks.c | 20 |
1 files changed, 20 insertions, 0 deletions
diff --git a/clang/test/CodeGen/delete-null-pointer-checks.c b/clang/test/CodeGen/delete-null-pointer-checks.c new file mode 100644 index 00000000000..a3c1460f0a0 --- /dev/null +++ b/clang/test/CodeGen/delete-null-pointer-checks.c @@ -0,0 +1,20 @@ +// 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"="true" +// NULL-POINTER-VALID: attributes #0 = {{.*}} "null-pointer-is-valid"="true" |
