https://gcc.gnu.org/bugzilla/show_bug.cgi?id=68339
Bug ID: 68339
Summary: g++.dg/vect/simd-clone-2.cc ICEs with aggressive GC
settings and OpenMP
Product: gcc
Version: 6.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: middle-end
Assignee: unassigned at gcc dot gnu.org
Reporter: jason at gcc dot gnu.org
CC: jakub at gcc dot gnu.org
Target Milestone: ---
Compiling g++.dg/vect/simd-clone-2.cc with
--param ggc-min-heapsize=0 --param ggc-min-expand=0 -fopenmp-simd
results in a memory corruption ICE. This seems to be because
expand_simd_clones calls simd_clone_mangle, which generates an identifier, and
then calls simd_clone_create, which eventually calls ggc_collect from
execute_one_ipa_transform_pass.
Since nothing refers to the identifier yet, it gets collected as garbage, so
when expand_simd_clones tries to use it the compiler blows up.
