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* [Bug c/38972] New: Failed constant folding and propagation in arithmetic expression. @ 2009-01-26 9:39 hironobu dot awazu at gmail dot com 2009-01-26 10:24 ` [Bug c/38972] " rguenth at gcc dot gnu dot org ` (2 more replies) 0 siblings, 3 replies; 4+ messages in thread From: hironobu dot awazu at gmail dot com @ 2009-01-26 9:39 UTC (permalink / raw) To: gcc-bugs The following code is expected to print "1." However, with -O1 or -O2 option, it prints "2." (-O0 option yields the correct output "1.") -------------------------------------------- Source code: #include <stdio.h> int main (void) { int test=1; volatile int a = 1; test += (0 == a); test += ((test + test) <= -69); printf("%d\n",test); return 0; } -------------------------------------------- Compiler command line: "gcc -O1", "gcc -O2" -------------------------------------------- Expected results: 1 -------------------------------------------- Observed results: 2 ------------------------------------------------------------- gcc -v output: Reading specs from /usr/lib/gcc/i686-pc-cygwin/3.4.4/specs Configured with: /usr/build/package/orig/test.respin/gcc-3.4.4-3/configure --verbose --prefix=/usr --exec-prefix=/usr --sysconfdir=/etc --libdir=/usr/lib --libexecdir=/usr/lib --mandir=/usr/share/man --infodir=/usr/share/info --enable-languages=c,ada,c++,d,f77,pascal,java,objc --enable-nls --without-included-gettext --enable-version-specific-runtime-libs --without-x --enable-libgcj --disable-java-awt --with-system-zlib --enable-interpreter --disable-libgcj-debug --enable-threads=posix --enable-java-gc=boehm --disable-win32-registry --enable-sjlj-exceptions --enable-hash-synchronization --enable-libstdcxx-debug Thread model: posix gcc version 3.4.4 (cygming special, gdc 0.12, using dmd 0.125) ------------------------------------------------------------- -- Summary: Failed constant folding and propagation in arithmetic expression. Product: gcc Version: 3.4.4 Status: UNCONFIRMED Severity: normal Priority: P3 Component: c AssignedTo: unassigned at gcc dot gnu dot org ReportedBy: hironobu dot awazu at gmail dot com http://gcc.gnu.org/bugzilla/show_bug.cgi?id=38972 ^ permalink raw reply [flat|nested] 4+ messages in thread
* [Bug c/38972] Failed constant folding and propagation in arithmetic expression. 2009-01-26 9:39 [Bug c/38972] New: Failed constant folding and propagation in arithmetic expression hironobu dot awazu at gmail dot com @ 2009-01-26 10:24 ` rguenth at gcc dot gnu dot org 2009-01-26 19:07 ` pinskia at gcc dot gnu dot org 2009-01-26 19:09 ` [Bug middle-end/38972] " pinskia at gcc dot gnu dot org 2 siblings, 0 replies; 4+ messages in thread From: rguenth at gcc dot gnu dot org @ 2009-01-26 10:24 UTC (permalink / raw) To: gcc-bugs ------- Comment #1 from rguenth at gcc dot gnu dot org 2009-01-26 10:24 ------- This is fixed in GCC 4.3.0 and later. We probably have a duplicate bugreport somewhere. -- rguenth at gcc dot gnu dot org changed: What |Removed |Added ---------------------------------------------------------------------------- Status|UNCONFIRMED |RESOLVED Resolution| |FIXED Target Milestone|--- |4.3.0 http://gcc.gnu.org/bugzilla/show_bug.cgi?id=38972 ^ permalink raw reply [flat|nested] 4+ messages in thread
* [Bug c/38972] Failed constant folding and propagation in arithmetic expression. 2009-01-26 9:39 [Bug c/38972] New: Failed constant folding and propagation in arithmetic expression hironobu dot awazu at gmail dot com 2009-01-26 10:24 ` [Bug c/38972] " rguenth at gcc dot gnu dot org @ 2009-01-26 19:07 ` pinskia at gcc dot gnu dot org 2009-01-26 19:09 ` [Bug middle-end/38972] " pinskia at gcc dot gnu dot org 2 siblings, 0 replies; 4+ messages in thread From: pinskia at gcc dot gnu dot org @ 2009-01-26 19:07 UTC (permalink / raw) To: gcc-bugs ------- Comment #2 from pinskia at gcc dot gnu dot org 2009-01-26 19:06 ------- Reopening to ... -- pinskia at gcc dot gnu dot org changed: What |Removed |Added ---------------------------------------------------------------------------- Status|RESOLVED |UNCONFIRMED Resolution|FIXED | http://gcc.gnu.org/bugzilla/show_bug.cgi?id=38972 ^ permalink raw reply [flat|nested] 4+ messages in thread
* [Bug middle-end/38972] Failed constant folding and propagation in arithmetic expression. 2009-01-26 9:39 [Bug c/38972] New: Failed constant folding and propagation in arithmetic expression hironobu dot awazu at gmail dot com 2009-01-26 10:24 ` [Bug c/38972] " rguenth at gcc dot gnu dot org 2009-01-26 19:07 ` pinskia at gcc dot gnu dot org @ 2009-01-26 19:09 ` pinskia at gcc dot gnu dot org 2 siblings, 0 replies; 4+ messages in thread From: pinskia at gcc dot gnu dot org @ 2009-01-26 19:09 UTC (permalink / raw) To: gcc-bugs ------- Comment #3 from pinskia at gcc dot gnu dot org 2009-01-26 19:09 ------- To mark as fixed for 4.0.0. This has been fixed for a while now. Most likely the gimplifier fixes it. -- pinskia at gcc dot gnu dot org changed: What |Removed |Added ---------------------------------------------------------------------------- Status|UNCONFIRMED |RESOLVED Component|c |middle-end Keywords| |wrong-code Known to work| |4.0.1 Resolution| |FIXED Target Milestone|4.3.0 |4.0.0 http://gcc.gnu.org/bugzilla/show_bug.cgi?id=38972 ^ permalink raw reply [flat|nested] 4+ messages in thread
end of thread, other threads:[~2009-01-26 19:09 UTC | newest] Thread overview: 4+ messages (download: mbox.gz / follow: Atom feed) -- links below jump to the message on this page -- 2009-01-26 9:39 [Bug c/38972] New: Failed constant folding and propagation in arithmetic expression hironobu dot awazu at gmail dot com 2009-01-26 10:24 ` [Bug c/38972] " rguenth at gcc dot gnu dot org 2009-01-26 19:07 ` pinskia at gcc dot gnu dot org 2009-01-26 19:09 ` [Bug middle-end/38972] " pinskia at gcc dot gnu dot org
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