https://gcc.gnu.org/bugzilla/show_bug.cgi?id=102587
qinzhao at gcc dot gnu.org changed:
What |Removed |Added
----------------------------------------------------------------------------
CC| |qinzhao at gcc dot gnu.org
--- Comment #6 from qinzhao at gcc dot gnu.org ---
with the committed patch, this testing case still failed but in a later rtl
stage:
qinzhao@gcc116:~/Bugs/102587$ sh t
/home/qinzhao/Install/latest/bin/gcc -ftrivial-auto-var-init=zero t.c -S
during RTL pass: pro_and_epilogue
t.c: In function ‘foo’:
t.c:1:33: internal compiler error: Segmentation fault
1 | void foo() { __SVFloat64_t f64; }
| ^
0xe18fab crash_signal
../../latest_gcc_git/gcc/toplev.c:331
0x122ed20 aarch64_add_offset
../../latest_gcc_git/gcc/config/aarch64/aarch64.c:5042
0x123044f aarch64_sub_sp
../../latest_gcc_git/gcc/config/aarch64/aarch64.c:5225
0x123044f aarch64_allocate_and_probe_stack_space
../../latest_gcc_git/gcc/config/aarch64/aarch64.c:8502
0x1230cfb aarch64_expand_prologue()
../../latest_gcc_git/gcc/config/aarch64/aarch64.c:8841
0x169fb63 gen_prologue()
../../latest_gcc_git/gcc/config/aarch64/aarch64.md:853
0x1226d17 target_gen_prologue
../../latest_gcc_git/gcc/config/aarch64/aarch64.md:7448
0xa9495f make_prologue_seq
../../latest_gcc_git/gcc/function.c:5825
0xa94b8b thread_prologue_and_epilogue_insns()
../../latest_gcc_git/gcc/function.c:6043
0xa95293 rest_of_handle_thread_prologue_and_epilogue
../../latest_gcc_git/gcc/function.c:6534
0xa95293 execute
../../latest_gcc_git/gcc/function.c:6610
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with preprocessed source if appropriate.
Please include the complete backtrace with any bug report.
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I think the reason is that the call to .DEFERRED_INIT (POLY_INI_CST[16,16], 2,
0) was not expanded at all during RTL expanding phase.
I feel the committed patch is not correct:
1. if we want to avoid auto initializing such auto variable, we should not add
call to .DEFERRED_INIT in gimplification phase at all.
2. not sure what does "POLY_INT_CST[16,16]" mean? is it a constant?
