[PATCH,MIPS] Fix pr86067 ICE: scal-to-vec1.c:86:1: error: unrecognizable insn with -march=loongson3a

[Paul Hua]

Thanks for your comments, commited as r261538.

Paul Hua

On Tue, Jun 12, 2018 at 8:09 PM, Matthew Fortune <mfortune@gmail.com> wrote:
> Paul Hua <paul.hua.gm@gmail.com> writes:
>> The gcc.c-torture/execute/scal-to-vec1.c  trigger a gcc ICE bug.
>>
>> It's a mistake in define_expand vec_setv4hi in loongson.md file.
>>
>> 375 (define_expand "vec_setv4hi"
>> 376   [(set (match_operand:V4HI 0 "register_operand" "=f")
>> 377         (unspec:V4HI [(match_operand:V4HI 1 "register_operand" "f")
>> 378                       (match_operand:HI 2 "register_operand" "f")
>> 379                       (match_operand:SI 3 "const_0_to_3_operand"
>> "")]
>> 380                      UNSPEC_LOONGSON_PINSRH))]
>> 381   "TARGET_HARD_FLOAT && TARGET_LOONGSON_VECTORS"
>> 382 {
>> 383   rtx ext = gen_reg_rtx (SImode);
>> 384   emit_move_insn (ext, gen_lowpart (SImode, operands[1]));
>> 385   operands[1] = ext;
>> 386 })
>>
>> The line 384 gen_lowpart the operands[1], should be gen_lowpart
>> operands[2], cause the operands[2] are HImode.
>>
>>
>> The attached patch fixed this bug.
>>
>> Bootstrapped and reg-tested on mips64el-unknown-linux-gnu.
>> Ok for commit ?
>>
>>
>> -------------------------------
>
> Hi Paul,
>
> This looks good, just one issue with the changelog entry. The entry
> would go in the gcc/ChangeLog file and the path is then relative to
> the gcc/ directory. The PR should be referenced as target/<num>:
>
> 2018-03-24  Chenghua Xu <paul.hua.gm@gmail.com>
>
>         PR target/86076
>         * config/mips/loongson.md (vec_setv4hi): Gen_lowpart for
>         operands[2] instead of operands[1].
>
> OK to commit, thanks for finding and fixing. This has been broken
> since 2011!
>
> Matthew
>