Mercurial > hg > CbC > CbC_gcc
comparison gcc/testsuite/gcc.dg/Wrestrict-2.c @ 131:84e7813d76e9
gcc-8.2
| author | mir3636 |
|---|---|
| date | Thu, 25 Oct 2018 07:37:49 +0900 |
| parents | |
| children |
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| 111:04ced10e8804 | 131:84e7813d76e9 |
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| 1 /* Test to verify that the temporary doesn't trigger a bogus -Warray-bounds | |
| 2 warning. Distilled from libat_exchange_large_inplace in libatomic/gexch.c. | |
| 3 { dg-do compile } | |
| 4 { dg-options "-O2 -Wall" } */ | |
| 5 | |
| 6 typedef typeof (sizeof 0) size_t; | |
| 7 | |
| 8 extern void *memcpy (void*, const void*, size_t); | |
| 9 | |
| 10 void libat_exchange_large_inplace (size_t n, void *mptr, void *vptr) | |
| 11 { | |
| 12 char temp[1024]; | |
| 13 | |
| 14 size_t i = 0; | |
| 15 | |
| 16 for (i = 0; n >= 1024; i += 1024, n -= 1024) | |
| 17 { | |
| 18 memcpy (temp, mptr + i, 1024); | |
| 19 | |
| 20 /* The memcpy call below results in the following: | |
| 21 unsigned long ivtmp.7; | |
| 22 | |
| 23 ivtmp.7_4 = (unsigned long) mptr_9(D); | |
| 24 ... | |
| 25 <bb 4> | |
| 26 # ivtmp.7_22 = PHI <ivtmp.7_4(3), ivtmp.7_5(4)> | |
| 27 ... | |
| 28 _1 = (void *) ivtmp.7_22; | |
| 29 ... | |
| 30 memcpy (_1, _2, 1024); | |
| 31 | |
| 32 Treating _1 as a pointer results in the bogus: | |
| 33 warning: 'memcpy' offset 0 is out of the bounds [0, 8] of object 'ivtmp.7' with type 'long unsigned int' [-Warray-bounds] | |
| 34 memcpy (mptr + i, vptr + i, 1024); | |
| 35 ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ | |
| 36 */ | |
| 37 memcpy (mptr + i, vptr + i, 1024); | |
| 38 | |
| 39 memcpy (vptr + i, temp, 1024); | |
| 40 } | |
| 41 } |