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and subject line Bug#325670: gcc-4.0: regression: generates wrong code for
inlined memcpy
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Date: Tue, 30 Aug 2005 00:34:01 -0700
From: Steve Langasek <[EMAIL PROTECTED]>
To: [EMAIL PROTECTED]
Subject: gcc-4.0: regression: generates wrong code for inlined memcpy
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Package: gcc-4.0
Version: 4.0.1-2
Severity: important
When passing pointers to 4-byte types to memcpy(), gcc-4.0 generates
wrong code which assumes that these pointers are aligned at 4-byte
boundaries for purposes of optimization, ignoring the implicit cast to
(char *) in the prototype of memcpy(). I don't believe code should have
to explicitly cast to (char *) to guard against such optimizations, and
it seems that memcpy() is quite likely to be used for copying data from
unaligned locations to aligned buffers precisely because it's supposed
to be capable of unaligned access. At least two packages, dhcp3 and
traceroute, have been reported as failing on sparc with bus errors when
built with gcc-4.0, because they use memcpy() to copy data from network
buffers where alignment is not guaranteed.
This bug has been reproduced with gcc-4.0 4.0.1-6 on vore using the
attached test case. The test case is derived from the failing code in
dhcp3 (bug #321987, #325605).
[EMAIL PROTECTED]:~$ gcc-4.0 -g -o memcpytest ./memcpytest.c && ./memcpytest
Bus error
[EMAIL PROTECTED]:~$ gcc-4.0 -DEXPLICIT_CAST -g -o memcpytest ./memcpytest.c &&
.=
/memcpytest
[EMAIL PROTECTED]:~$
Thanks,
--=20
Steve Langasek Give me a lever long enough and a Free OS
Debian Developer to set it on, and I can move the world.
[EMAIL PROTECTED] http://www.debian.org/
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Content-Disposition: attachment; filename="memcpytest.c"
#include <stdlib.h>
#include <string.h>
#include <netinet/in.h>
int main() {
unsigned char buf[512];
unsigned bufix = 14;
struct sockaddr_in from;
struct sockaddr_in *src = (struct sockaddr_in *)(buf+bufix);
#ifdef EXPLICIT_CAST
memcpy (&from.sin_addr, (char *)&src->sin_addr, 4);
#else
memcpy (&from.sin_addr, &src->sin_addr, 4);
#endif
exit(0);
}
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To: [EMAIL PROTECTED]
Subject: Bug#325670: gcc-4.0: regression: generates wrong code for inlined
memcpy
From: Falk Hueffner <[EMAIL PROTECTED]>
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Hi,
consensus seems to be that his is not a bug in gcc, so closing.
--
Falk
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