[Bug c/32328] New: 4.2.0: -O2 causes skipped code

["tdragon at tdragon dot net" <gcc-bugzilla at gcc dot gnu dot org>]

When the attached file is compiled with a mingw32 build of GCC 4.2.0 using the
-O2 option (gcc -O2 -c timestamp2.i), lines 159 and 160 are never executed when
running the program that uses this file. Since the hashitem function modifies
the variable b which is passed to it by-address, leaving those statements out
is definitely not a valid optimization. Compiling without -O2 (gcc -c
timestamp2.i) gives the correct result. Sorry I can't read assembler, or I'd
try to narrow things down more.

This is a regression from 4.1.2, which works correctly with or without -O2. If
it helps, the GCC binaries I use (and sources) can be downloaded at
http://hosted.filefront.com/tldragon7.


-- 
           Summary: 4.2.0: -O2 causes skipped code
           Product: gcc
           Version: 4.2.0
            Status: UNCONFIRMED
          Severity: major
          Priority: P3
         Component: c
        AssignedTo: unassigned at gcc dot gnu dot org
        ReportedBy: tdragon at tdragon dot net
 GCC build triplet: i386-pc-mingw32
  GCC host triplet: i386-pc-mingw32
GCC target triplet: i386-pc-mingw32


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=32328