https://gcc.gnu.org/bugzilla/show_bug.cgi?id=65177
--- Comment #2 from Martin Liška <marxin at gcc dot gnu.org> --- (In reply to Martin Liška from comment #0) > Hello. > > Starting with r218451, http://hmmer.janelia.org/ started to be miscompiled. > > Steps to reproduce: > wget > http://selab.janelia.org/software/hmmer3/3.1b1/hmmer-3.1b1-linux-intel- > x86_64.tar.gz > tar xvzf hmmer-3.1b1-cygwin.tar.gz > cd hmmer-3.1b1-cygwin > CFLAGS="-g -O1 -ftree-vrp -fexpensive-optimizations" ./configure > make > make check > > and following test fails: > gdb src/impl_sse/optacc_utest > > Program received signal SIGSEGV, Segmentation fault. > 0x0000000000406a2c in select_i (k=<optimized out>, i=0, gx=0x45ed60, > gm=0x470420) at generic_optacc.c:293 > 293 path[0] = TSCDELTA(p7P_MI, k) * MMX(i-1,k); > (gdb) bt > #0 0x0000000000406a2c in select_i (k=<optimized out>, i=0, gx=0x45ed60, > gm=0x470420) at generic_optacc.c:293 The reason for memory corruption is caused by select_i function called with i == 0, which causes memory load for array[-1]. Martin > #1 p7_GOATrace (gm=0x470420, pp=pp@entry=0x466150, gx=gx@entry=0x45ed60, > tr=tr@entry=0x46e4e0) at generic_optacc.c:220 > #2 0x000000000040322f in utest_optacc (go=go@entry=0x44e010, > r=r@entry=0x44e170, abc=abc@entry=0x44eb50, bg=bg@entry=0x44ed90, > M=M@entry=45, L=L@entry=50, N=19) at ./optacc.c:659 > #3 0x0000000000403613 in main (argc=<optimized out>, argv=<optimized out>) > at ./optacc.c:801 > > I really tried to reduce test case, but unfortunately it's very hard to do > it for the project. > Please tell me if you are capable of reproducing the issue? > > Thanks, > Martin
