[Bug target/71549] ICE on valid code at -O2 and -O3 with -g enabled in 64-bit mode on x86_64-linux-gnu: in simplify_subreg, at simplify-rtx.c:5952

[hjl.tools at gmail dot com]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=71549

--- Comment #4 from H.J. Lu <hjl.tools at gmail dot com> ---
Created attachment 38725
  --> https://gcc.gnu.org/bugzilla/attachment.cgi?id=38725&action=edit
A patch

I am testing this.