21 lines · c
1// RUN: %clang_cc1 -emit-llvm -triple x86_64-unknown-linux-gnu -O2 -o - %s | FileCheck -check-prefix=NULL-POINTER-INVALID %s2// 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 %s3 4// Test that clang does not remove the null pointer check with5// -fno-delete-null-pointer-checks.6int null_check(int *P) {7// NULL-POINTER-VALID: %[[TOBOOL:.*]] = icmp eq ptr %P, null8// NULL-POINTER-INVALID-NOT: icmp eq9// NULL-POINTER-VALID: %[[SEL:.*]] = select i1 %[[TOBOOL:.*]], ptr null, ptr10// NULL-POINTER-INVALID-NOT: select i111// NULL-POINTER-VALID: load i32, ptr %[[SEL:.*]]12 int *Q = P;13 if (P) {14 Q = P + 2;15 }16 return *Q;17}18 19// NULL-POINTER-INVALID-NOT: attributes #0 = {{.*}} null_pointer_is_valid20// NULL-POINTER-VALID: attributes #0 = {{.*}} null_pointer_is_valid21