reg...@john-home:~/volatile/bugs/tmp270$ current-gcc -O -g small.c -c small.c: In function func_24: small.c:11:6: internal compiler error: in simplify_subreg, at simplify-rtx.c:5146 Please submit a full bug report, with preprocessed source if appropriate. See <http://gcc.gnu.org/bugs.html> for instructions.
reg...@john-home:~/volatile/bugs/tmp270$ cat small.c #pragma pack(1) struct S1 { unsigned char f0; unsigned short f1; short f2; unsigned f3:24; }; #pragma pack() void func_24 (struct S1 p_27) { for (; p_27.f2; p_27.f2 = 1) { } } reg...@john-home:~/volatile/bugs/tmp270$ current-gcc -v Using built-in specs. COLLECT_GCC=current-gcc COLLECT_LTO_WRAPPER=/home/regehr/z/tmp/gcc-r157027-install/libexec/gcc/i686-pc-linux-gnu/4.5.0/lto-wrapper Target: i686-pc-linux-gnu Configured with: ../configure --with-libelf=/usr/local --enable-lto --prefix=/home/regehr/z/tmp/gcc-r157027-install --program-prefix=r157027- --enable-languages=c,c++ Thread model: posix gcc version 4.5.0 20100224 (experimental) (GCC) -- Summary: ice in simplify_subreg, at simplify-rtx.c:5146 Product: gcc Version: 4.5.0 Status: UNCONFIRMED Severity: normal Priority: P3 Component: c AssignedTo: unassigned at gcc dot gnu dot org ReportedBy: regehr at cs dot utah dot edu GCC build triplet: i686-pc-linux-gnu GCC host triplet: i686-pc-linux-gnu GCC target triplet: i686-pc-linux-gnu http://gcc.gnu.org/bugzilla/show_bug.cgi?id=43165