[Bug c/71505] New: -O3 internal compiler error in vect_analyze_data_ref_accesses, at tree-vect-data-refs.c:2596

[tony at kelman dot net]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=71505

            Bug ID: 71505
           Summary: -O3 internal compiler error in
                    vect_analyze_data_ref_accesses, at
                    tree-vect-data-refs.c:2596
           Product: gcc
           Version: 5.3.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: c
          Assignee: unassigned at gcc dot gnu.org
          Reporter: tony at kelman dot net
  Target Milestone: ---

Created attachment 38687
  --> https://gcc.gnu.org/bugzilla/attachment.cgi?id=38687&action=edit
cholmod_updown.i

This is in Alpine Linux - I can provide a Docker container and/or the
pre-reduced test case if it would help. Works at -O2, errors at -O3.


gcc -v -O3 -c cholmod_updown.i

Using built-in specs.
COLLECT_GCC=gcc
Target: x86_64-alpine-linux-musl
Configured with: /home/buildozer/aports/main/gcc/src/gcc-5.3.0/configure
--prefix=/usr --mandir=/usr/share/man --infodir=/usr/share/info
--build=x86_64-alpine-linux-musl --host=x86_64-alpine-linux-musl
--target=x86_64-alpine-linux-musl --with-pkgversion='Alpine 5.3.0'
--enable-checking=release --disable-fixed-point --disable-libstdcxx-pch
--disable-multilib --disable-nls --disable-werror --disable-symvers
--enable-__cxa_atexit --enable-esp --enable-cloog-backend
--enable-languages=c,c++,objc,java,fortran,ada --disable-libssp
--disable-libmudflap --disable-libsanitizer --enable-shared --enable-threads
--enable-tls --with-system-zlib
Thread model: posix
gcc version 5.3.0 (Alpine 5.3.0) 
COLLECT_GCC_OPTIONS='-v' '-O3' '-c' '-mtune=generic' '-march=x86-64' '-fPIE'
'-pie' '-fstack-protector-strong'
 /usr/libexec/gcc/x86_64-alpine-linux-musl/5.3.0/cc1 -fpreprocessed
cholmod_updown.i -fno-strict-overflow -quiet -dumpbase cholmod_updown.i
-mtune=generic -march=x86-64 -auxbase cholmod_updown -O3 -version -fPIE
-fstack-protector-strong -o /tmp/cchiEaiB.s
GNU C11 (Alpine 5.3.0) version 5.3.0 (x86_64-alpine-linux-musl)
        compiled by GNU C version 5.3.0, GMP version 6.1.0, MPFR version 3.1.2,
MPC version 1.0.3
GGC heuristics: --param ggc-min-expand=100 --param ggc-min-heapsize=131072
GNU C11 (Alpine 5.3.0) version 5.3.0 (x86_64-alpine-linux-musl)
        compiled by GNU C version 5.3.0, GMP version 6.1.0, MPFR version 3.1.2,
MPC version 1.0.3
GGC heuristics: --param ggc-min-expand=100 --param ggc-min-heapsize=131072
Compiler executable checksum: a4d39a24f4e8cf2c8d4e626e52fac5ce
cholmod_updown.i: In function 'fn1':
cholmod_updown.i:4:6: internal compiler error: in
vect_analyze_data_ref_accesses, at tree-vect-data-refs.c:2596
 void fn1() {
      ^
Please submit a full bug report,
with preprocessed source if appropriate.
See <http://gcc.gnu.org/bugs.html> for instructions.