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* [Bug target/21642] New: wrong code with -O2 @ 2005-05-18 10:02 joerg dot richter at pdv-fs dot de 2005-06-06 15:17 ` [Bug target/21642] " dje at gcc dot gnu dot org 2005-06-06 15:20 ` [Bug target/21642] [3.4 Regression] " pinskia at gcc dot gnu dot org 0 siblings, 2 replies; 5+ messages in thread From: joerg dot richter at pdv-fs dot de @ 2005-05-18 10:02 UTC (permalink / raw) To: gcc-bugs $ gcc -v Reading specs from /pdv/.tools/pkg/gcc/3.4.3/bin/../lib/gcc/powerpc-ibm- aix5.2.0.0/3.4.3/specs Configured with: ../gcc-3.4.3/configure --prefix=/tools/pkg/gcc/3.4.3 --with- ld=/bin/ld --with-as=/bin/as --disable-threads --enable-languages=c,c++ Thread model: aix gcc version 3.4.3 // foo.c // #include <stdio.h> inline void reverse( char* beg, char* end ) { while( beg < --end ) { char t = *end; *end = *beg; *beg++ = t; } } void doIt( int* val ) { reverse( (char*)val, (char*)val + sizeof( *val ) ); } int main() { int d = 0x12345678; printf( "%x\n", d ); doIt( &d ); printf( "%x\n", d ); return 0; } //// $ gcc -o foo foo.c -O2 $ foo 12345678 78345612 $ gcc -o foo foo.c $ foo 12345678 78563412 Works with GCC 3.3.3 -- Summary: wrong code with -O2 Product: gcc Version: 3.4.3 Status: UNCONFIRMED Severity: normal Priority: P2 Component: target AssignedTo: unassigned at gcc dot gnu dot org ReportedBy: joerg dot richter at pdv-fs dot de CC: gcc-bugs at gcc dot gnu dot org GCC build triplet: powerpc-ibm-aix5.2.0.0 GCC host triplet: powerpc-ibm-aix5.2.0.0 GCC target triplet: powerpc-ibm-aix5.2.0.0 http://gcc.gnu.org/bugzilla/show_bug.cgi?id=21642 ^ permalink raw reply [flat|nested] 5+ messages in thread
* [Bug target/21642] wrong code with -O2 2005-05-18 10:02 [Bug target/21642] New: wrong code with -O2 joerg dot richter at pdv-fs dot de @ 2005-06-06 15:17 ` dje at gcc dot gnu dot org 2005-06-06 15:20 ` [Bug target/21642] [3.4 Regression] " pinskia at gcc dot gnu dot org 1 sibling, 0 replies; 5+ messages in thread From: dje at gcc dot gnu dot org @ 2005-06-06 15:17 UTC (permalink / raw) To: gcc-bugs ------- Additional Comments From dje at gcc dot gnu dot org 2005-06-06 15:17 ------- This appears to be related to strength reduction. -O2 -fno-strength-reduce succeeds -O1 -fstrength-reduce fails. The bug is not present in GCC 4. -- What |Removed |Added ---------------------------------------------------------------------------- Status|UNCONFIRMED |NEW Ever Confirmed| |1 Keywords| |wrong-code Known to fail| |3.4.3 3.4.4 Known to work| |4.0.0 4.0.1 4.1.0 Last reconfirmed|0000-00-00 00:00:00 |2005-06-06 15:17:14 date| | http://gcc.gnu.org/bugzilla/show_bug.cgi?id=21642 ^ permalink raw reply [flat|nested] 5+ messages in thread
* [Bug target/21642] [3.4 Regression] wrong code with -O2 2005-05-18 10:02 [Bug target/21642] New: wrong code with -O2 joerg dot richter at pdv-fs dot de 2005-06-06 15:17 ` [Bug target/21642] " dje at gcc dot gnu dot org @ 2005-06-06 15:20 ` pinskia at gcc dot gnu dot org 1 sibling, 0 replies; 5+ messages in thread From: pinskia at gcc dot gnu dot org @ 2005-06-06 15:20 UTC (permalink / raw) To: gcc-bugs -- What |Removed |Added ---------------------------------------------------------------------------- Summary|wrong code with -O2 |[3.4 Regression] wrong code | |with -O2 Target Milestone|--- |3.4.5 http://gcc.gnu.org/bugzilla/show_bug.cgi?id=21642 ^ permalink raw reply [flat|nested] 5+ messages in thread
[parent not found: <bug-21642-5469@http.gcc.gnu.org/bugzilla/>]
* [Bug target/21642] [3.4 Regression] wrong code with -O2 [not found] <bug-21642-5469@http.gcc.gnu.org/bugzilla/> @ 2005-10-07 4:04 ` gdr at gcc dot gnu dot org 2006-02-28 11:29 ` gdr at gcc dot gnu dot org 1 sibling, 0 replies; 5+ messages in thread From: gdr at gcc dot gnu dot org @ 2005-10-07 4:04 UTC (permalink / raw) To: gcc-bugs -- gdr at gcc dot gnu dot org changed: What |Removed |Added ---------------------------------------------------------------------------- Target Milestone|3.4.5 |3.4.6 http://gcc.gnu.org/bugzilla/show_bug.cgi?id=21642 ^ permalink raw reply [flat|nested] 5+ messages in thread
* [Bug target/21642] [3.4 Regression] wrong code with -O2 [not found] <bug-21642-5469@http.gcc.gnu.org/bugzilla/> 2005-10-07 4:04 ` gdr at gcc dot gnu dot org @ 2006-02-28 11:29 ` gdr at gcc dot gnu dot org 1 sibling, 0 replies; 5+ messages in thread From: gdr at gcc dot gnu dot org @ 2006-02-28 11:29 UTC (permalink / raw) To: gcc-bugs ------- Comment #2 from gdr at gcc dot gnu dot org 2006-02-28 10:19 ------- won't fix for 3.4.6 -- gdr at gcc dot gnu dot org changed: What |Removed |Added ---------------------------------------------------------------------------- Status|NEW |RESOLVED Resolution| |WONTFIX http://gcc.gnu.org/bugzilla/show_bug.cgi?id=21642 ^ permalink raw reply [flat|nested] 5+ messages in thread
end of thread, other threads:[~2006-02-28 10:19 UTC | newest] Thread overview: 5+ messages (download: mbox.gz / follow: Atom feed) -- links below jump to the message on this page -- 2005-05-18 10:02 [Bug target/21642] New: wrong code with -O2 joerg dot richter at pdv-fs dot de 2005-06-06 15:17 ` [Bug target/21642] " dje at gcc dot gnu dot org 2005-06-06 15:20 ` [Bug target/21642] [3.4 Regression] " pinskia at gcc dot gnu dot org [not found] <bug-21642-5469@http.gcc.gnu.org/bugzilla/> 2005-10-07 4:04 ` gdr at gcc dot gnu dot org 2006-02-28 11:29 ` gdr at gcc dot gnu dot org
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