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[Bug rtl-optimization/36321] Optimization higher or eqaul to -O2 produce wrong code
- From: "ktietz at gcc dot gnu dot org" <gcc-bugzilla at gcc dot gnu dot org>
- To: gcc-bugs at gcc dot gnu dot org
- Date: 24 May 2008 16:36:58 -0000
- Subject: [Bug rtl-optimization/36321] Optimization higher or eqaul to -O2 produce wrong code
- References: <bug-36321-15155@http.gcc.gnu.org/bugzilla/>
- Reply-to: gcc-bugzilla at gcc dot gnu dot org
------- Comment #2 from ktietz at gcc dot gnu dot org 2008-05-24 16:36 -------
(In reply to comment #1)
> Can you try this patch:
>
> Index: i386.md
> ===================================================================
> --- i386.md (revision 135849)
> +++ i386.md (working copy)
> @@ -19707,7 +19707,7 @@
> (set_attr "length" "5")])
>
> (define_insn "allocate_stack_worker_64"
> - [(set (match_operand:DI 0 "register_operand" "=a")
> + [(set (match_operand:DI 0 "register_operand" "+a")
> (unspec_volatile:DI [(match_dup 0)] UNSPECV_STACK_PROBE))
> (set (reg:DI SP_REG) (minus:DI (reg:DI SP_REG) (match_dup 0)))
> (clobber (reg:DI R10_REG))
>
I tried it. There is no difference.
--
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=36321