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[Bug tree-optimization/23855] Should not do loop header copying for inner loop
- 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: 13 Sep 2005 14:01:51 -0000
- Subject: [Bug tree-optimization/23855] Should not do loop header copying for inner loop
- References: <20050913094645.23855.rguenth@gcc.gnu.org>
- Reply-to: gcc-bugzilla at gcc dot gnu dot org
------- Additional Comments From pinskia at gcc dot gnu dot org 2005-09-13 14:01 -------
On PPC, we get optimal and almost unswitched loop:
L4:
ble- cr4,L7
li r31,0
L6:
addi r31,r31,1
bl _bar
cmpw cr7,r30,r31
bne+ cr7,L6
L7:
addi r29,r29,1
cmpw cr7,r28,r29
bne+ cr7,L4
cr4 is a callee save register.
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http://gcc.gnu.org/bugzilla/show_bug.cgi?id=23855