[SystemZ] Set usaAA to true

useAA significantly improves the handling of vector code that has TBAA
information attached.  It also helps other cases, as shown by the testsuite
changes here.  The only real downside I've seen is that it interferes with
MergeConsecutiveStores.  The problem is that that optimization works top
down, starting at the first store in the chain, and looks for cases where
the chain result is only used by a single related store.  These related
stores don't alias, so useAA will have rewritten all the later stores to
use a different chain input (typically the same one as the first store).

I think the advantages outweigh the disadvantages though, so for now I've
just disabled alias analysis for the unaligned-01.ll test.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@193521 91177308-0d34-0410-b5e6-96231b3b80d8

1 files changed, 4 insertions, 1 deletions

diff --git a/test/CodeGen/SystemZ/unaligned-01.ll b/test/CodeGen/SystemZ/unaligned-01.ll
index 621069d239d..526a068100e 100644
--- a/test/CodeGen/SystemZ/unaligned-01.ll
+++ b/test/CodeGen/SystemZ/unaligned-01.ll
@@ -1,7 +1,10 @@
 ; Check that unaligned accesses are allowed in general.  We check the
 ; few exceptions (like CRL) in their respective test files.
 ;
-; RUN: llc < %s -mtriple=s390x-linux-gnu | FileCheck %s
+; FIXME: -combiner-alias-analysis (the default for SystemZ) stops
+;        f1 from being optimized.
+; RUN: llc < %s -mtriple=s390x-linux-gnu -combiner-alias-analysis=false \
+; RUN:   | FileCheck %s
 
 ; Check that these four byte stores become a single word store.
 define void @f1(i8 *%ptr) {