The attached test case produces this warning:
$ gcc -save-temps -O2 shortened.c -o shortened
shortened.s: Assembler messages:
shortened.s:21: Warning: 00000003fffffffc shortened to 00000000fffffffc
This only happens with -O2, not with -O0 or -O1.
I can reproduce this on the following versions (these are all from prebuilt
Debian packages):
gcc-4.0 (GCC) 4.0.4 20060507 (prerelease) (Debian 4.0.3-3)
gcc-4.1 (GCC) 4.1.2 20061028 (prerelease) (Debian 4.1.1-19)
The following versions seem to be unaffected:
gcc-3.4 (GCC) 3.4.6 (Debian 3.4.6-5)
gcc-4.2 (GCC) 4.2.1 20070627 (prerelease) (Debian 4.2-20070627-1)
--
Summary: Bogus warning "00000003fffffffc shortened to
00000000fffffffc"
Product: gcc
Version: 4.0.4
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: c
AssignedTo: unassigned at gcc dot gnu dot org
ReportedBy: hlinnaka at iki dot fi
GCC build triplet: i486-pc-linux-gnu
GCC host triplet: i486-pc-linux-gnu
GCC target triplet: i486-pc-linux-gnu
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=32750
