http://gcc.gnu.org/bugzilla/show_bug.cgi?id=50802
--- Comment #15 from Jorn Wolfgang Rennecke <amylaar at gcc dot gnu.org> 2011-11-18 22:15:29 UTC --- Created attachment 25855 --> http://gcc.gnu.org/bugzilla/attachment.cgi?id=25855 Preprocessed testcase for epiphany I can't reproduce the test on gcc20, I think this is a 32 vs. 64 bit build and/or host machine issue. I can reproduce the problem on a 32 bit system: Linux purzah 3.1.1-1.fc16.i686.PAE #1 SMP Fri Nov 11 22:04:40 UTC 2011 i686 i686 i386 GNU/Linux I have used trunk revision 181442 . configured for --target=epiphany-elf . You don't need Epiphany for this, you can just make "all-gcc", and when it has configured the gcc build directory, you can stop the build, cd to the gcc build directory, and build just cc1. compile the preprocessed sources with: ./cc1 -O2 -dumpbase arith-rand-ll.c arith-rand-ll.i -o arith-rand-ll.s -fdump-tree-all in arith-rand-ll.c.080t.dom1, you can see in line 543 r2_98 = (signed char) D.2263_64 earlier, the same ssa variable has been used in r2_65 = (short int) D.2263_64; both uses are, in fact, incorrect, because D.2263_64 is calculated as 32 bit signed modulo of 32 bit x and y.
