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[Bug target/11877] gcc should use xor trick with -Os
- From: "dann at godzilla dot ics dot uci dot edu" <gcc-bugzilla at gcc dot gnu dot org>
- To: gcc-bugs at gcc dot gnu dot org
- Date: 5 Jan 2006 20:22:35 -0000
- Subject: [Bug target/11877] gcc should use xor trick with -Os
- References: <bug-11877-5724@http.gcc.gnu.org/bugzilla/>
- Reply-to: gcc-bugzilla at gcc dot gnu dot org
------- Comment #9 from dann at godzilla dot ics dot uci dot edu 2006-01-05 20:22 -------
(In reply to comment #7)
> *** Bug 23338 has been marked as a duplicate of this bug. ***
>
Bug 23338 contained a patch that might fixed this issue. Here it is, so
that it can be evaluated.
*** i386.md 08 Aug 2005 16:38:37 -0700 1.652
--- i386.md 11 Aug 2005 11:27:11 -0700
***************
*** 18874,18881 ****
[(match_scratch:SI 1 "r")
(set (match_operand:SI 0 "memory_operand" "")
(const_int 0))]
! "! optimize_size
! && ! TARGET_USE_MOV0
&& TARGET_SPLIT_LONG_MOVES
&& get_attr_length (insn) >= ix86_cost->large_insn
&& peep2_regno_dead_p (0, FLAGS_REG)"
--- 18874,18880 ----
[(match_scratch:SI 1 "r")
(set (match_operand:SI 0 "memory_operand" "")
(const_int 0))]
! "! TARGET_USE_MOV0
&& TARGET_SPLIT_LONG_MOVES
&& get_attr_length (insn) >= ix86_cost->large_insn
&& peep2_regno_dead_p (0, FLAGS_REG)"
--
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=11877