test/ubsan_minimal/TestCases/alignment-assumption.c

// RUN: %clang -fsanitize=alignment %s -o %t && %run %t 2>&1 | FileCheck %s --check-prefixes=CHECK

#include <stdlib.h>

int main(int argc, char* argv[]) {
// CHECK-NOT: alignment-assumption

char *ptr = (char *)malloc(2);

__builtin_assume_aligned(ptr + 1, 0x8000);
// CHECK: alignment-assumption
// CHECK-NOT: alignment-assumption

free(ptr);

return 0;
}