[Bug rtl-optimization/91865] Combine misses opportunity to remove (sign_extend (zero_extend)) before searching for insn patterns

[jozefl.gcc at gmail dot com]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=91865

--- Comment #3 from Jozef Lawrynowicz <jozefl.gcc at gmail dot com> ---
Created attachment 46936
  --> https://gcc.gnu.org/bugzilla/attachment.cgi?id=46936&action=edit
msp430-extendhipsi2.diff