------- Comment #29 from janis at gcc dot gnu dot org 2008-10-29 17:05 -------
On powerpc-linux the submitter's testcase gets better code with the patch from
comment #17, but the same testcase with the loop starting with 1 instead of
zero gets worse code. From the 4.1 branch with -O2:
.L2:
lfd 0,0(9)
addi 9,9,8
stfd 0,0(11)
addi 11,11,8
bdnz .L2
>From the 4.2 branch:
.L2:
add 9,10,0
add 11,10,8
addi 10,10,8
lfd 0,8(9)
stfd 0,8(11)
bdnz .L2
Code from current mainline is the same except for the order of the addi and lfd
instructions.
--
janis at gcc dot gnu dot org changed:
What |Removed |Added
----------------------------------------------------------------------------
CC| |janis at gcc dot gnu dot org
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=29256
