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[Bug target/16457] PowerPC - Combine two rldicr instructions into a single rlwinm.
- 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 Nov 2004 15:41:19 -0000
- Subject: [Bug target/16457] PowerPC - Combine two rldicr instructions into a single rlwinm.
- References: <20040709175338.16457.steinmtz@us.ibm.com>
- Reply-to: gcc-bugzilla at gcc dot gnu dot org
------- Additional Comments From pinskia at gcc dot gnu dot org 2004-11-03 15:41 -------
What is happening is the following instruction is being split up:
(insn:HI 14 13 15 0 (parallel [
(set (reg:DI 123)
(and:DI (reg/v:DI 118 [ x ])
(const_int 4294967294 [0xfffffffe])))
(clobber (scratch:CC))
]) 273 {anddi3} (nil)
(expr_list:REG_DEAD (reg/v:DI 118 [ x ])
(expr_list:REG_UNUSED (scratch:CC)
(nil))))
It is being split up inefficently.
--
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=16457