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[Bug c++/15795] No way to teach operator new anything about alignment requirements
- From: "bangerth at dealii dot org" <gcc-bugzilla at gcc dot gnu dot org>
- To: gcc-bugs at gcc dot gnu dot org
- Date: 3 Jun 2004 17:39:32 -0000
- Subject: [Bug c++/15795] No way to teach operator new anything about alignment requirements
- References: <20040603143635.15795.ma1flfs@bath.ac.uk>
- Reply-to: gcc-bugzilla at gcc dot gnu dot org
------- Additional Comments From bangerth at dealii dot org 2004-06-03 17:39 -------
Oh, I should have said that indeed on my system, the memory location
is 8-byte aligned, not 16-byte aligned. If I do make it 16-byte
aligned, for example with a hack like this
char *p = new char[10000];
__m128 * foo = (__m128*)(((int)(p+16))/16*16);
(for which I have no idea whether it is in accordance with aliasing rules),
then the program correctly succeeds. Nevertheless, I believe that gcc
should have some way of transmitting alignment requirements when it allocated
memory.
W.
--
What |Removed |Added
----------------------------------------------------------------------------
Summary|Strange bug / incorrect code|No way to teach operator new
|generation with SSE |anything about alignment
| |requirements
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=15795