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Re: Patch to fix incorrect uses of sets_cc0_p.
- To: geoffk at geoffk dot org
- Subject: Re: Patch to fix incorrect uses of sets_cc0_p.
- From: John Wehle <john at feith dot com>
- Date: Tue, 7 Aug 2001 23:03:21 -0400 (EDT)
- Cc: gcc-patches at gcc dot gnu dot org, hp at bitrange dot com
>> (define_expand "cmpsi"
>> [(set (cc0)
>> (compare:CC (match_operand:SI 0 "register_operand" "")
>> (match_operand:SI 1 "arith_operand" "")))]
>> ""
>> "
>> {
>> if (operands[0]) /* avoid unused code message */
>> {
>> branch_cmp[0] = operands[0];
>> branch_cmp[1] = operands[1];
>> branch_type = CMP_SI;
>> DONE;
>> }
>> }")
>>
>> In what sense is it not a CC0 target?
>
>In the sense that the reference cc0 will never really be generated?
>The code always hits a DONE, so doesn't output any rtl for cmpsi.
I see what you mean. It's a curious way to write a machine description.
Time to test the patch on a different simulator. Thanks to all for
clarifying the issue.
-- John
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