------- Comment #2 from zsojka at seznam dot cz 2010-04-07 02:07 -------
Created an attachment (id=20326)
--> (http://gcc.gnu.org/bugzilla/attachment.cgi?id=20326&action=view)
another testcase, probably better
copied from gcc/testsuite/gcc.dg/tree-ssa/gen-vect-32.c (gen-vect-2.c fails the
same way), but removed headers to prevent confusion
Issue is the same, reading value before store:
...
cmpb $5, 1(%esp) #, s.ca
movdqa .LC0, %xmm0 #, tmp78
movdqa %xmm0, (%esp) # tmp78,
jne .L2 #,
...
Command line:
gcc -O3 -fsched2-use-superblocks -m32 && ./a.out
flags can be changed to:
-O1 -fpeel-loops -fschedule-insns2 -ftree-vectorize -fsched2-use-superblocks
-m32
This testcase fails in 4.4.3 too (but 4.3.4 works)
--
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=43671
