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Re: libstdc++/6732: misaligned objects created by new
- From: bkoz at gcc dot gnu dot org
- To: gcc-bugs at gcc dot gnu dot org, gcc-prs at gcc dot gnu dot org, nobody at gcc dot gnu dot org, wesslen at users dot sourceforge dot net
- Date: 4 Jul 2002 05:51:50 -0000
- Subject: Re: libstdc++/6732: misaligned objects created by new
- Reply-to: bkoz at gcc dot gnu dot org, gcc-bugs at gcc dot gnu dot org, gcc-prs at gcc dot gnu dot org, nobody at gcc dot gnu dot org, wesslen at users dot sourceforge dot net, gcc-gnats at gcc dot gnu dot org
Synopsis: misaligned objects created by new
State-Changed-From-To: open->analyzed
State-Changed-By: bkoz
State-Changed-When: Wed Jul 3 22:51:48 2002
State-Changed-Why:
I'm not quite convinced that this is a C++ library problem.
It seems like "C" also has the same issue.
Note that gcc-2.96, others also have the same behavior.
#include <iostream>
struct vec4
{
float x, y, z, w;
} __attribute__((__aligned__(16)));
int main()
{
std::allocator<vec4> a;
for (int i = 0; i < 10; ++i)
{
vec4* p = new vec4;
std::cerr << reinterpret_cast<void*>(p) << " ";
std::cerr << reinterpret_cast<std::size_t>(p) % 16 << " ";
std::cerr << std::endl;
}
for (int i = 0; i < 10; ++i)
{
vec4* p = reinterpret_cast<vec4*>(malloc(sizeof(vec4)));
std::cerr << reinterpret_cast<void*>(p) << " ";
std::cerr << reinterpret_cast<std::size_t>(p) % 16 << " ";
std::cerr << std::endl;
}
}
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