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[Bug libc/206] New: malloc does not align memory correctly for sse capable systems
- From: "ma1flfs at bath dot ac dot uk" <sourceware-bugzilla at sources dot redhat dot com>
- To: glibc-bugs at sources dot redhat dot com
- Date: 5 Jun 2004 14:22:39 -0000
- Subject: [Bug libc/206] New: malloc does not align memory correctly for sse capable systems
- Reply-to: sourceware-bugzilla at sources dot redhat dot com
>From what I gather, malloc is supposed to return memory aligned respecting the
most strict alignment requirements there are for a system. Currently this is 8
bytes for i686 systems. This should be 16 bytes because of the __m128 type sse
intrinsics use.
See also this gcc "bug" for more details:
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=15795
Basically, this program segfaults:
------------------------------------------
#include <xmmintrin.h>
int main() {
__m128 * foo = new __m128;
*foo = _mm_setzero_ps();
}
------------------------------------------
--
Summary: malloc does not align memory correctly for sse capable
systems
Product: glibc
Version: 2.3.3
Status: NEW
Severity: critical
Priority: P2
Component: libc
AssignedTo: gotom at debian dot or dot jp
ReportedBy: ma1flfs at bath dot ac dot uk
CC: glibc-bugs at sources dot redhat dot com
GCC build triplet: i686-pc-linux-gnu
GCC host triplet: i686-pc-linux-gnu
GCC target triplet: i686-pc-linux-gnu
http://sources.redhat.com/bugzilla/show_bug.cgi?id=206
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