On Sun, 2023-11-19 at 19:52 -0700, Jeff Law wrote:

/* snip */

> 
> > Unfortunately, I get some ICE building stage 1 libgcc with this patch on
> > loongarch64-linux-gnu:
> > 
> > during RTL pass: ext_dce
> > ../../../gcc/libgcc/libgcc2.c: In function ‘__absvdi2’:
> > ../../../gcc/libgcc/libgcc2.c:224:1: internal compiler error: Segmentation fault
> >    224 | }
> >        | ^
> > 0x120baa477 crash_signal
> > 	../../gcc/gcc/toplev.cc:316
> > 0x1216aeeb4 ext_dce_process_sets
> > 	../../gcc/gcc/ext-dce.cc:128
> > 0x1216afbaf ext_dce_process_bb
> > 	../../gcc/gcc/ext-dce.cc:647
> > 0x1216afbaf ext_dce
> > 	../../gcc/gcc/ext-dce.cc:802
> > 0x1216afbaf execute
> > 	../../gcc/gcc/ext-dce.cc:868
> > Please submit a full bug report, with preprocessed source (by using -freport-bug).
> > Please include the complete backtrace with any bug report.
> > See <https://gcc.gnu.org/bugs/> for instructions.
> I think I know what's going on here.

The gzip-compressed preprocessed file attached, in case you still need
it.

-- 
Xi Ruoyao <xry111@xry111.site>
School of Aerospace Science and Technology, Xidian University