------- Comment #6 from janis at gcc dot gnu dot org 2010-02-12 20:36 -------
In the attached testcase wrong code is generated for the loop in subroutine
sub3 that sets 12 of the elements of array k to zero. While minimizing the
testcase I saw different kinds of bad code for that array, but with this
version it's:
vxor 31,31,31
ld 9,....@toc(2)
ld 29,....@toc(2)
li 0,16
stvx 31,0,29
add 9,9,9
stvx 31,0,9
stvx 31,9.0
Needless to say, doubling the array address has bad consequences. It would
make
sense if the instruction were instead "add 9,29,0"
I'm planning to stare at dump files for awhile but won't complain if someone
else figures it out first.
--
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=42431
