[Bug target/121096] [16 Regression] ICE: in store_by_pieces, at expr.cc:1847 with -Os -mtune=k8 -mvpclmulqdq -mstringop-strategy=vector_loop

[zsojka at seznam dot cz via Gcc-bugs]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=121096

--- Comment #1 from Zdenek Sojka <zsojka at seznam dot cz> ---
Created attachment 61879
  --> https://gcc.gnu.org/bugzilla/attachment.cgi?id=61879&action=edit
testcase with less compiler flags

$ x86_64-pc-linux-gnu-gcc -Os -mstringop-strategy=unrolled_loop -mtune=btver2
testcase2.c 
during RTL pass: expand
testcase2.c: In function 'foo':
testcase2.c:6:24: internal compiler error: in store_by_pieces, at expr.cc:1847
    6 |     _BitInt(512) a = b >> 507;
      |                      ~~^~~~~~
...