https://gcc.gnu.org/bugzilla/show_bug.cgi?id=96920
Bug ID: 96920
Summary: ICE segmentation fault in tree-vectorizer at -O3
Product: gcc
Version: 10.2.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: fortran
Assignee: unassigned at gcc dot gnu.org
Reporter: hj8758558 at gmail dot com
Target Milestone: ---
Created attachment 49179
--> https://gcc.gnu.org/bugzilla/attachment.cgi?id=49179&action=edit
Example Fortran source file to trigger ICE in tree-vectorizer.
When I compile the attached code example with gfortran 10.x series at -O3, I
get the following compiler seg fault. The code compiles okay with gfortran 9.1.
The only previous bug report that I found that might be related is:
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=95539
$ gfortran -v
Using built-in specs.
COLLECT_GCC=gfortran
COLLECT_LTO_WRAPPER=/users/joshua.hykes/opt/gcc/linux-64/gcc-10.2.0/bin/../libexec/gcc/x86_64-pc-linux-gnu/10.2.0/lto-wrapper
Target: x86_64-pc-linux-gnu
Configured with:
/users/joshua.hykes/opt/gcc/linux-64/gcc-10.2.0-build/../gcc-10.2.0-src/configure
--prefix=/users/joshua.hykes/opt/gcc/linux-64/gcc-10.2.0-build/../gcc-10.2.0/
--enable-languages=c,c++,fortran,go
Thread model: posix
Supported LTO compression algorithms: zlib
gcc version 10.2.0 (GCC)
$ cat ice.f90
subroutine ice(npoint, nterm, x, g)
implicit none
integer norder
parameter (norder=10)
integer j
integer k
integer ii
integer nterm
integer npoint
real b(norder)
real c(norder)
real d(norder)
real x(npoint)
real g(npoint)
real gg
real prev
real prev2
!
j = 1
100 continue
j = j+1
if (nterm == j) then
do ii=1,npoint
k = nterm
gg= d(k)
prev= 0.0
do k=k-1,1,-1
prev2= prev
prev= gg
gg = d(k)+(x(ii)-b(k))*prev-c(k+1)*prev2
enddo
g(ii) = gg
enddo
endif
go to 100
end
$ gfortran -O3 -c ice.f90
during GIMPLE pass: vect
ice.f90:1:0:
1 | subroutine ice(npoint, nterm, x, g)
|
internal compiler error: Segmentation fault
0xbeddaf crash_signal
/users/joshua.hykes/opt/gcc/linux-64/gcc-10.2.0-build/../gcc-10.2.0-src/gcc/toplev.c:328
0x2b14706162ef ???
/usr/src/debug/glibc-2.17-c758a686/signal/../sysdeps/unix/sysv/linux/x86_64/sigaction.c:0
0xd01227 find_uses_to_rename_use
/users/joshua.hykes/opt/gcc/linux-64/gcc-10.2.0-build/../gcc-10.2.0-src/gcc/tree-ssa-loop-manip.c:393
0xd01227 find_uses_to_rename_bb
/users/joshua.hykes/opt/gcc/linux-64/gcc-10.2.0-build/../gcc-10.2.0-src/gcc/tree-ssa-loop-manip.c:468
0xd02e57 find_uses_to_rename
/users/joshua.hykes/opt/gcc/linux-64/gcc-10.2.0-build/../gcc-10.2.0-src/gcc/tree-ssa-loop-manip.c:500
0xd02e57 rewrite_into_loop_closed_ssa_1(bitmap_head*, unsigned int, int, loop*)
/users/joshua.hykes/opt/gcc/linux-64/gcc-10.2.0-build/../gcc-10.2.0-src/gcc/tree-ssa-loop-manip.c:666
0xe17043 vectorize_loops()
/users/joshua.hykes/opt/gcc/linux-64/gcc-10.2.0-build/../gcc-10.2.0-src/gcc/tree-vectorizer.c:1197
Please submit a full bug report,
with preprocessed source if appropriate.
Please include the complete backtrace with any bug report.
See <https://gcc.gnu.org/bugs/> for instructions.
