https://gcc.gnu.org/bugzilla/show_bug.cgi?id=82576
Bug ID: 82576
Summary: sbitmap_vector_alloc() not ready for 64 bits
Product: gcc
Version: 8.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: rtl-optimization
Assignee: unassigned at gcc dot gnu.org
Reporter: babokin at gmail dot com
Target Milestone: ---
Created attachment 42382
--> https://gcc.gnu.org/bugzilla/attachment.cgi?id=42382&action=edit
Reproducer
gcc trunk, rev253744, x86_64.
Trying compile attached test case with UBSAN I get segfault:
during RTL pass: cprop
f.cpp: In function ‘void tf_1_foo()’:
f.cpp:335:3: internal compiler error: Segmentation fault
}
^
0xf4b65f crash_signal
../../gcc/gcc/toplev.c:326
0x1684418 sbitmap_vector_alloc(unsigned int, unsigned int)
../../gcc/gcc/sbitmap.c:171
0x1562dc3 alloc_cprop_mem
../../gcc/gcc/cprop.c:558
0x1562dc3 one_cprop_pass
../../gcc/gcc/cprop.c:1818
0x1562dc3 execute_rtl_cprop
../../gcc/gcc/cprop.c:1932
0x1562dc3 execute
../../gcc/gcc/cprop.c:1970
This is due to sbitmap_vector_alloc() implementation using "unsigned int",
instead of size_t. Fixing this make test case compile (even though consuming a
lot of memory, about 80Gb).
>g++ -std=c++11 -fsanitize=undefined -fno-sanitize-recover=undefined -w
>-Werror=uninitialized -O2 -c f.cpp
