------- Comment #2 from ramana at gcc dot gnu dot org 2009-05-15 08:26 -------
(In reply to comment #1)
> This is caused by a typo in arm.md.
>
> (define_insn "cstoresi_nltu_thumb1"
> [(set (match_operand:SI 0 "s_register_operand" "=l,l")
> (neg:SI (gtu:SI (match_operand:SI 1 "s_register_operand" "l,*h")
> (match_operand:SI 2 "thumb1_cmp_operand"
> "lI*h,*r"))))]
> "TARGET_THUMB1"
> "cmp\\t%1, %2\;sbc\\t%0, %0, %0"
> [(set_attr "length" "4")]
> )
>
> The instruction cstoresi_nltu_thumb1 is used to compute the expression -(x <
> y)
> where x and y are unsigned SI-type values. The operand of the NEG RTX should
> be a LTU RTX instead of a GTU RTX. The incorrected RTX code caused a later
> CSE
> pass to substitute this pattern:
>
> (set x
> (neg (gtu a b))) <=== cstoresi_nltu_thumb1
> (set y (neg x))
>
> with
>
> (set y (gtu a b))
>
> I tried fixing the RTX code and the test case passed.
>
This looks correct. Please submit a patch to gcc-patc...@.
--
ramana at gcc dot gnu dot org changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|UNCONFIRMED |NEW
Ever Confirmed|0 |1
Last reconfirmed|0000-00-00 00:00:00 |2009-05-15 08:26:09
date| |
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=40153
