https://gcc.gnu.org/bugzilla/show_bug.cgi?id=110939
--- Comment #10 from Chenghui Pan <panchenghui at loongson dot cn> --- (In reply to Stefan Schulze Frielinghaus from comment #9) > Thanks for the reproducer and sorry for the hassle. > > The normal form of a constant for a mode with fewer bits than in > HOST_WIDE_INT is a sign extended version of the original constant. This > even holds for unsigned constants which I missed. The following should fix > this: > > diff --git a/gcc/combine.cc b/gcc/combine.cc > index e46d202d0a7..9e5bf96a09d 100644 > --- a/gcc/combine.cc > +++ b/gcc/combine.cc > @@ -12059,7 +12059,7 @@ simplify_compare_const (enum rtx_code code, > machine_mode mode, > : (GET_MODE_SIZE (int_mode) > - GET_MODE_SIZE (narrow_mode_iter))); > *pop0 = adjust_address_nv (op0, narrow_mode_iter, offset); > - *pop1 = GEN_INT (n); > + *pop1 = gen_int_mode (n, narrow_mode_iter); > return adjusted_code; > } > } > > Can you give this a try? Bootstrapping is successful with this, thank you!
