clang/test/CodeGen/PR32874.c

   1 // RUN: %clang_cc1 -x c -S -emit-llvm -o - -triple x86_64-apple-darwin10 %s \
   2 // RUN:   -w -fsanitize=signed-integer-overflow,unsigned-integer-overflow,integer-divide-by-zero,float-divide-by-zero \
   3 // RUN:   | FileCheck %s
   4
   5 // CHECK-LABEL: define{{.*}} void @foo
   6 // CHECK-NOT: !nosanitize
   7 void foo(const int *p) {
   8   // __builtin_prefetch expects its optional arguments to be constant integers.
   9   // Check that ubsan does not instrument any safe arithmetic performed in
  10   // operands to __builtin_prefetch. (A clang frontend check should reject
  11   // unsafe arithmetic in these operands.)
  12
  13   __builtin_prefetch(p, 0 + 1, 0 + 3);
  14   __builtin_prefetch(p, 1 - 0, 3 - 0);
  15   __builtin_prefetch(p, 1 * 1, 1 * 3);
  16   __builtin_prefetch(p, 1 / 1, 3 / 1);
  17   __builtin_prefetch(p, 3 % 2, 3 % 1);
  18
  19   __builtin_prefetch(p, 0U + 1U, 0U + 3U);
  20   __builtin_prefetch(p, 1U - 0U, 3U - 0U);
  21   __builtin_prefetch(p, 1U * 1U, 1U * 3U);
  22   __builtin_prefetch(p, 1U / 1U, 3U / 1U);
  23   __builtin_prefetch(p, 3U % 2U, 3U % 1U);
  24 }
  25
  26 // CHECK-LABEL: define{{.*}} void @ub_constant_arithmetic
  27 void ub_constant_arithmetic(void) {
  28   // Check that we still instrument unsafe arithmetic, even if it is known to
  29   // be unsafe at compile time.
  30
  31   int INT_MIN = 0xffffffff;
  32   int INT_MAX = 0x7fffffff;
  33
  34   // CHECK: call void @__ubsan_handle_add_overflow
  35   // CHECK: call void @__ubsan_handle_add_overflow
  36   INT_MAX + 1;
  37   INT_MAX + -1;
  38
  39   // CHECK: call void @__ubsan_handle_negate_overflow
  40   // CHECK: call void @__ubsan_handle_sub_overflow
  41   -INT_MIN;
  42   -INT_MAX - 2;
  43
  44   // CHECK: call void @__ubsan_handle_mul_overflow
  45   // CHECK: call void @__ubsan_handle_mul_overflow
  46   INT_MAX * INT_MAX;
  47   INT_MIN * INT_MIN;
  48
  49   // CHECK: call void @__ubsan_handle_divrem_overflow
  50   // CHECK: call void @__ubsan_handle_divrem_overflow
  51   1 / 0;
  52   INT_MIN / -1;
  53
  54   // CHECK: call void @__ubsan_handle_divrem_overflow
  55   // CHECK: call void @__ubsan_handle_divrem_overflow
  56   1 % 0;
  57   INT_MIN % -1;
  58
  59   // CHECK: call void @__ubsan_handle_divrem_overflow
  60   1.0 / 0.0;
  61 }