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From: "siarhei dot siamashka at gmail dot com" <gcc-bugzilla@gcc.gnu.org> To: gcc-bugs@gcc.gnu.org Subject: [Bug c/43698] New: Invalid code when building gentoo pax-utils-0.1.19 with -Os optimizations Date: Fri, 09 Apr 2010 00:05:00 -0000 [thread overview] Message-ID: <bug-43698-14457@http.gcc.gnu.org/bugzilla/> (raw) Tested with gcc-4.5.0-RC-20100406.tar.bz2 Reduced testcase: /*********************************************************/ #include <stdio.h> #include <stdint.h> char do_reverse_endian = 0; # define bswap_32(x) \ ((((x) & 0xff000000) >> 24) | \ (((x) & 0x00ff0000) >> 8) | \ (((x) & 0x0000ff00) << 8) | \ (((x) & 0x000000ff) << 24)) #define EGET(X) \ (__extension__ ({ \ uint64_t __res; \ if (!do_reverse_endian) { __res = (X); \ } else if (sizeof(X) == 4) { __res = bswap_32((X)); \ } \ __res; \ })) void __attribute__((noinline)) X(char **phdr, char **data, int *phoff) { *phdr = *data + EGET(*phoff); } int main() { char *phdr; char *data = (char *)0x40164000; int phoff = 0x34; X(&phdr, &data, &phoff); printf("got %p (expecting 0x40164034)\n", phdr); return 0; } /*********************************************************/ # gcc -Os -o test test.c # ./test got 0x74164000 (expecting 0x40164034) -- Summary: Invalid code when building gentoo pax-utils-0.1.19 with -Os optimizations Product: gcc Version: 4.5.0 Status: UNCONFIRMED Severity: normal Priority: P3 Component: c AssignedTo: unassigned at gcc dot gnu dot org ReportedBy: siarhei dot siamashka at gmail dot com GCC build triplet: armv7l-unknown-linux-gnueabi GCC host triplet: armv7l-unknown-linux-gnueabi GCC target triplet: armv7l-unknown-linux-gnueabi http://gcc.gnu.org/bugzilla/show_bug.cgi?id=43698
next reply other threads:[~2010-04-09 0:05 UTC|newest] Thread overview: 22+ messages / expand[flat|nested] mbox.gz Atom feed top 2010-04-09 0:05 siarhei dot siamashka at gmail dot com [this message] 2010-04-09 5:49 ` [Bug target/43698] " mikpe at it dot uu dot se 2010-04-09 6:57 ` mikpe at it dot uu dot se 2010-04-09 7:02 ` ramana at gcc dot gnu dot org 2010-04-09 7:38 ` ramana at gcc dot gnu dot org 2010-04-09 7:49 ` ramana at gcc dot gnu dot org 2010-04-09 8:05 ` siarhei dot siamashka at gmail dot com 2010-04-09 8:42 ` [Bug target/43698] [4.5/4.6 Regression] " rguenth at gcc dot gnu dot org 2010-04-12 8:38 ` ramana at gcc dot gnu dot org 2010-04-12 9:34 ` siarhei dot siamashka at gmail dot com 2010-04-12 9:51 ` Ramana Radhakrishnan 2010-04-12 9:51 ` ramana dot radhakrishnan at arm dot com 2010-05-17 18:48 ` siarhei dot siamashka at gmail dot com 2010-05-19 12:25 ` rguenth at gcc dot gnu dot org 2010-07-03 16:06 ` armin76 at gentoo dot org 2010-07-19 13:54 ` [Bug target/43698] [4.5/4.6 Regression] Wrong use of ARMv6 REV instruction for endian bytewapping with -Os or -O2 optimizations siarhei dot siamashka at gmail dot com 2010-07-22 8:31 ` ramana at gcc dot gnu dot org 2010-07-22 20:54 ` siarhei dot siamashka at gmail dot com 2010-07-23 12:22 ` ramana at gcc dot gnu dot org 2010-07-23 12:28 ` rguenther at suse dot de 2010-07-30 22:36 ` ramana at gcc dot gnu dot org 2010-07-30 22:39 ` ramana at gcc dot gnu dot org
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