"Maciej W. Rozycki" <ma...@codesourcery.com> writes:
> 2014-11-17 Maciej W. Rozycki <ma...@codesourcery.com>
>
> gcc/
> * gcc/config/mips/mips.md (*jump_absolute): Use a branch when in
> range, a jump otherwise.
>
> Maciej
>
> gcc-mips-jump-branch.diff
> Index: gcc-fsf-trunk-quilt/gcc/config/mips/mips.md
> ===================================================================
> --- gcc-fsf-trunk-quilt.orig/gcc/config/mips/mips.md 2014-11-16
> 19:54:17.000000000 +0000
> +++ gcc-fsf-trunk-quilt/gcc/config/mips/mips.md 2014-11-17
> 04:44:32.847732003 +0000
> @@ -5957,14 +5957,12 @@
> (label_ref (match_operand 0)))]
> "!TARGET_MIPS16 && TARGET_ABSOLUTE_JUMPS"
> {
> - /* Use a branch for microMIPS. The assembler will choose
> - a 16-bit branch, a 32-bit branch, or a 32-bit jump. */
> - if (TARGET_MICROMIPS && !TARGET_ABICALLS_PIC2)
> + if (get_attr_length (insn) <= 8)
> return "%*b\t%l0%/";
> else
> return MIPS_ABSOLUTE_JUMP ("%*j\t%l0%/");
> }
> - [(set_attr "type" "jump")])
> + [(set_attr "type" "branch")])
You didn't mention it explicitly, but this will have the effect of
overestimating the length of the insn by 8 bytes in cases where the
jump is used. That might be an acceptable trade-off (even for
non-microMIPS code) but it's probably worth mentioning in a comment.
Thanks,
Richard
