https://gcc.gnu.org/bugzilla/show_bug.cgi?id=116044
--- Comment #1 from Thomas Schwinge <tschwinge at gcc dot gnu.org> ---
Recent commit r15-2199-g34f33ea801563e2eabb348e8d3e9344a91abfd48 "rtl-ssa:
Avoid using a stale splay tree root [PR116009]" is causing one regression for
'--target=amdgcn-amdhsa' (tested '-march=gfx908'):
PASS: g++.dg/torture/pr81987.C -O0 (test for excess errors)
PASS: g++.dg/torture/pr81987.C -O1 (test for excess errors)
PASS: g++.dg/torture/pr81987.C -O2 (test for excess errors)
PASS: g++.dg/torture/pr81987.C -O3 -g (test for excess errors)
{+FAIL: g++.dg/torture/pr81987.C -Os (internal compiler error: in
merge_clobber_groups, at rtl-ssa/accesses.cc:764)+}
[-PASS:-]{+FAIL:+} g++.dg/torture/pr81987.C -Os (test for excess errors)
during RTL pass: late_combine
[...]/source-gcc/gcc/testsuite/g++.dg/torture/pr81987.C: In function 'void
foo()':
[...]/source-gcc/gcc/testsuite/g++.dg/torture/pr81987.C:61:1: internal
compiler error: in merge_clobber_groups, at rtl-ssa/accesses.cc:764
0x2406235 internal_error(char const*, ...)
[...]/source-gcc/gcc/diagnostic-global-context.cc:491
0xb80382 fancy_abort(char const*, int, char const*)
[...]/source-gcc/gcc/diagnostic.cc:1725
0xb68dc1
rtl_ssa::function_info::merge_clobber_groups(rtl_ssa::clobber_info*,
rtl_ssa::clobber_info*, rtl_ssa::def_info*)
[...]/source-gcc/gcc/rtl-ssa/accesses.cc:764
0x226d49e rtl_ssa::function_info::remove_def(rtl_ssa::def_info*)
[...]/source-gcc/gcc/rtl-ssa/accesses.cc:1036
0x2274463
rtl_ssa::function_info::change_insns(array_slice<rtl_ssa::insn_change*>)
[...]/source-gcc/gcc/rtl-ssa/changes.cc:852
0x222672a run
[...]/source-gcc/gcc/late-combine.cc:452
0x222672a combine_into_uses
[...]/source-gcc/gcc/late-combine.cc:683
0x2226c1d execute
[...]/source-gcc/gcc/late-combine.cc:711
0x2226c1d execute
[...]/source-gcc/gcc/late-combine.cc:760
