[Bug tree-optimization/82166] New: gcc ICE at -Os on valid code on x86_64-linux-gnu in "ix86_finalize_stack_frame_flags"

[helloqirun at gmail dot com]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=82166

            Bug ID: 82166
           Summary: gcc ICE at -Os on valid code on x86_64-linux-gnu in
                    "ix86_finalize_stack_frame_flags"
           Product: gcc
           Version: 8.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: tree-optimization
          Assignee: unassigned at gcc dot gnu.org
          Reporter: helloqirun at gmail dot com
  Target Milestone: ---

$ gcc-trunk -v
Using built-in specs.
COLLECT_GCC=gcc-trunk
COLLECT_LTO_WRAPPER=/home/absozero/trunk/root-gcc/libexec/gcc/x86_64-pc-linux-gnu/8.0.0/lto-wrapper
Target: x86_64-pc-linux-gnu
Configured with: ../gcc/configure --prefix=/home/absozero/trunk/root-gcc
--enable-languages=c,c++ --disable-werror --enable-multilib
Thread model: posix
gcc version 8.0.0 20170909 (experimental) [trunk revision 251936] (GCC)



$ gcc-trunk -Os -m32 abc.c
abc.c:1:6: warning: conflicting types for built-in function ‘printf’
[-Wbuiltin-declaration-mismatch]
 void printf();
      ^~~~~~
during RTL pass: pro_and_epilogue
abc.c: In function ‘main’:
abc.c:9:1: internal compiler error: in ix86_finalize_stack_frame_flags, at
config/i386/i386.c:14271
 }
 ^
0x7ada6c ix86_finalize_stack_frame_flags
        ../../gcc/gcc/config/i386/i386.c:14271
0xfc71fb ix86_expand_epilogue(int)
        ../../gcc/gcc/config/i386/i386.c:15414
0x11b7b8f gen_epilogue()
        ../../gcc/gcc/config/i386/i386.md:12700
0xfaae48 target_gen_epilogue
        ../../gcc/gcc/config/i386/i386.md:12211
0xae15e8 make_epilogue_seq
        ../../gcc/gcc/function.c:5864
0xae16fc thread_prologue_and_epilogue_insns()
        ../../gcc/gcc/function.c:5946
0xae1dc2 rest_of_handle_thread_prologue_and_epilogue
        ../../gcc/gcc/function.c:6436
0xae1dc2 execute
        ../../gcc/gcc/function.c:6478
Please submit a full bug report,
with preprocessed source if appropriate.
Please include the complete backtrace with any bug report.
See <https://gcc.gnu.org/bugs/> for instructions.



$ cat abc.c
void printf();
int a, b, c;
int main() {
  int j;
  for (; c;)
    a = b;
  for (; j;)
    printf();
}