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[Bug middle-end/42588] unnecessary move through x87 stack/local frame for union
- From: "pinskia at gcc dot gnu dot org" <gcc-bugzilla at gcc dot gnu dot org>
- To: gcc-bugs at gcc dot gnu dot org
- Date: 3 Jan 2010 06:46:29 -0000
- Subject: [Bug middle-end/42588] unnecessary move through x87 stack/local frame for union
- References: <bug-42588-7834@http.gcc.gnu.org/bugzilla/>
- Reply-to: gcc-bugzilla at gcc dot gnu dot org
------- Comment #1 from pinskia at gcc dot gnu dot org 2010-01-03 06:46 -------
;; __u.__d = __x_1(D);
(insn 6 5 0 t.c:15 (set (subreg:DF (reg/v:DI 60 [ __u ]) 0)
(reg/v:DF 62 [ __x ])) -1 (nil))
That causes a reload to happen:
Reload 0: reload_out (DF) = (subreg:DF (reg/v:DI 60 [ __u ]) 0)
FLOAT_REGS, RELOAD_FOR_OUTPUT (opnum = 0)
reload_out_reg: (subreg:DF (reg/v:DI 60 [ __u ]) 0)
reload_reg_rtx: (reg:DF 8 st)
I think I might have another bug about this issue before ...
--
pinskia at gcc dot gnu dot org changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|UNCONFIRMED |NEW
Ever Confirmed|0 |1
Keywords| |missed-optimization
Last reconfirmed|0000-00-00 00:00:00 |2010-01-03 06:46:29
date| |
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=42588