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[Bug tree-optimization/20204] [4.0 regression] miscompilation of asm-declared registers
- From: "dnovillo at gcc dot gnu dot org" <gcc-bugzilla at gcc dot gnu dot org>
- To: gcc-bugs at gcc dot gnu dot org
- Date: 25 Feb 2005 16:48:54 -0000
- Subject: [Bug tree-optimization/20204] [4.0 regression] miscompilation of asm-declared registers
- References: <20050225005902.20204.hp@gcc.gnu.org>
- Reply-to: gcc-bugzilla at gcc dot gnu dot org
------- Additional Comments From dnovillo at gcc dot gnu dot org 2005-02-25 16:48 -------
(In reply to comment #9)
> I've confirmed on this other machine that the update caused the same breakage.
>
Ah, yes. I see it now. The reorg tickled a bug in the renamer:
# n_21 = V_MUST_DEF <n_18>
n = D.1158_28
...
n_48 = PHI <n_37, n21>
<L2>:
...
# VUSE <n_21>
n.5_40 = n;
That's wrong. The last VUSE should be VUSE <n_48>. Virtual operands should
always be in FUD-chain form.
Working on a fix.
--
What |Removed |Added
----------------------------------------------------------------------------
AssignedTo|unassigned at gcc dot gnu |dnovillo at gcc dot gnu dot
|dot org |org
Status|NEW |ASSIGNED
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=20204