gcc/testsuite/gcc.dg/Wrestrict-6.c

   1 /* PR tree-optimization/83640 - ice in generic_overlap, at
   2    gimple-ssa-warn-restrict.c:814
   3    Test to verify that a pointer offset range whose upper bound is less
   4    than its lower bound (when interpreted as a signed integer) is handled
   5    correctly.
   6    { dg-do compile }
   7    { dg-options "-O2 -Wrestrict" }  */
   8
   9 #include "range.h"
  10
  11 extern char* strcpy (char*, const char*);
  12 extern char* stpcpy (char*, const char*);
  13
  14 void sink (void*);
  15
  16 void warn_2_smax_p2 (void)
  17 {
  18   char a[7] = "01234";
  19
  20   char *d = a;
  21
  22   ptrdiff_t i = UR (2, DIFF_MAX + (size_t)2);
  23
  24   strcpy (d, d + i);          /* { dg-warning "accessing between 0 and 4 bytes at offsets 0 and \\\[2, 7] may overlap up to 2 bytes at offset 2" } */
  25
  26   sink (d);
  27 }
  28
  29 void nowarn_3_smax_p2 (void)
  30 {
  31   char a[7] = "12345";
  32
  33   char *d = a;
  34
  35   ptrdiff_t i = UR (3, DIFF_MAX + (size_t)2);
  36
  37   strcpy (d, d + i);
  38
  39   sink (d);
  40 }
  41
  42 void warn_2u_smax_p2 (void)
  43 {
  44   char a[7] = "23456";
  45
  46   char *d = a;
  47
  48   size_t i = UR (2, DIFF_MAX + (size_t)2);
  49
  50   strcpy (d, d + i);          /* { dg-warning "accessing between 0 and 4 bytes at offsets 0 and \\\[2, 7] may overlap up to 2 bytes at offset 2" } */
  51
  52   sink (d);
  53 }
  54
  55 void nowarn_3u_smax_p2 (void)
  56 {
  57   char a[7] = "34567";
  58
  59   char *d = a;
  60
  61   size_t i = UR (3, DIFF_MAX + (size_t)2);
  62
  63   strcpy (d, d + i);
  64
  65   sink (d);
  66 }