https://gcc.gnu.org/bugzilla/show_bug.cgi?id=102682
Bug ID: 102682
Summary: [12 Regression] ICE in simplify_gen_subreg_concatn, at
lower-subreg.c:717
Product: gcc
Version: 12.0
Status: UNCONFIRMED
Keywords: ice-on-valid-code
Severity: normal
Priority: P3
Component: target
Assignee: unassigned at gcc dot gnu.org
Reporter: asolokha at gmx dot com
Target Milestone: ---
Target: x86_64-pc-linux-gnu
Created attachment 51583
--> https://gcc.gnu.org/bugzilla/attachment.cgi?id=51583&action=edit
Testcase
g++-12.0.0-alpha20211003 snapshot (g:d91056851c5c60f226e3192fb955d018b53eb66f)
ICEs when compiling the attached testcase, partially reduced from
test/std/experimental/simd/simd.mem/store.pass.cpp from the libcxx 12.0.0 test
suite, w/ -mavx2 -O1 -fno-tree-sra --param
sccvn-max-alias-queries-per-access=1:
% x86_64-pc-linux-gnu-g++-12.0.0 -mavx2 -O1 -fno-tree-sra --param
sccvn-max-alias-queries-per-access=1 -c iwely7yr.cpp
during RTL pass: subreg1
iwely7yr.cpp: In function 'void test_converting_store()':
iwely7yr.cpp:99:1: internal compiler error: in simplify_gen_subreg_concatn, at
lower-subreg.c:717
99 | }
| ^
0x8ff0de simplify_gen_subreg_concatn
/var/tmp/portage/sys-devel/gcc-12.0.0_alpha20211003/work/gcc-12-20211003/gcc/lower-subreg.c:717
0x1e92481 resolve_simple_move
/var/tmp/portage/sys-devel/gcc-12.0.0_alpha20211003/work/gcc-12-20211003/gcc/lower-subreg.c:1091
0x1e93531 decompose_multiword_subregs
/var/tmp/portage/sys-devel/gcc-12.0.0_alpha20211003/work/gcc-12-20211003/gcc/lower-subreg.c:1657
0x1e93eca execute
/var/tmp/portage/sys-devel/gcc-12.0.0_alpha20211003/work/gcc-12-20211003/gcc/lower-subreg.c:1773
