| // 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 ptr %P, null |
| // NULL-POINTER-INVALID-NOT: icmp eq |
| // NULL-POINTER-VALID: %[[SEL:.*]] = select i1 %[[TOBOOL:.*]], ptr null, ptr |
| // NULL-POINTER-INVALID-NOT: select i1 |
| // NULL-POINTER-VALID: load i32, ptr %[[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 |
