https://gcc.gnu.org/bugzilla/show_bug.cgi?id=108193
Bug ID: 108193
Summary: [13 Regression] ICE in do_SUBST, at combine.cc:700
Product: gcc
Version: 13.0
Status: UNCONFIRMED
Keywords: ice-on-valid-code
Severity: normal
Priority: P3
Component: rtl-optimization
Assignee: unassigned at gcc dot gnu.org
Reporter: asolokha at gmx dot com
Target Milestone: ---
Target: aarch64-linux-gnu
gcc 13.0.0 20221218 snapshot (g:fd69977febf399d1992bbf8d66ae9170e0a4dc9f) ICEs
when compiling the following testcase w/ -O2 -fsplit-loops
-ftree-parallelize-loops=2 -fno-tree-dominator-opts:
subroutine foo (n, r)
implicit none
integer :: i, j, n
real :: s, r(*)
s = 0.0
do j = 1, 2
do i = j, n
s = r(i)
end do
end do
do i = 1, n
do j = i, n
s = s + 1
end do
r(i) = s
end do
end subroutine foo
% aarch64-linux-gnu-gfortran-13 -O2 -fsplit-loops -ftree-parallelize-loops=2
-fno-tree-dominator-opts -c fzcqm8no.f90
during RTL pass: combine
fzcqm8no.f90:20:18:
20 | end subroutine foo
| ^
internal compiler error: in do_SUBST, at combine.cc:700
0x845011 do_SUBST
/var/tmp/portage/cross-aarch64-linux-gnu/gcc-13.0.0_p20221218/work/gcc-13-20221218/gcc/combine.cc:700
0x1b53990 subst
/var/tmp/portage/cross-aarch64-linux-gnu/gcc-13.0.0_p20221218/work/gcc-13-20221218/gcc/combine.cc:5579
0x1b5671b try_combine
/var/tmp/portage/cross-aarch64-linux-gnu/gcc-13.0.0_p20221218/work/gcc-13-20221218/gcc/combine.cc:3299
0x1b5c19a combine_instructions
/var/tmp/portage/cross-aarch64-linux-gnu/gcc-13.0.0_p20221218/work/gcc-13-20221218/gcc/combine.cc:1410
0x1b5c19a rest_of_handle_combine
/var/tmp/portage/cross-aarch64-linux-gnu/gcc-13.0.0_p20221218/work/gcc-13-20221218/gcc/combine.cc:14978
0x1b5c19a execute
/var/tmp/portage/cross-aarch64-linux-gnu/gcc-13.0.0_p20221218/work/gcc-13-20221218/gcc/combine.cc:15023
