Hi,
Test gcc.dg/tree-ssa/pr71347 failed on some targets if the two memory
references are re-written into different forms by IVOPT. This could be because
of various reasons, for example, auto-increment addressing mode. Since the
address expressions are of different form, DOM fails to eliminate the redundant
load at the moment. I think DOM should be improved to handle address
expressions appearing in different forms (at least for simple cases). For now,
I will XFAIL this test indicating a possible enhancement.
Test checked on affected targets. Is it OK?
Thanks,
bin
gcc/testsuite/ChangeLog
2016-06-20 Bin Cheng <bin.ch...@arm.com>
PR tree-optimization/71347
* gcc.dg/tree-ssa/pr71347.c: XFAIL on ia64, arm, m68k and sparc.
diff --git a/gcc/testsuite/gcc.dg/tree-ssa/pr71347.c
b/gcc/testsuite/gcc.dg/tree-ssa/pr71347.c
index c8f87a9..428e41b 100644
--- a/gcc/testsuite/gcc.dg/tree-ssa/pr71347.c
+++ b/gcc/testsuite/gcc.dg/tree-ssa/pr71347.c
@@ -14,4 +14,4 @@ void foo (void)
}
/* Load of X[i - i] can be omitted by reusing X[i] in previous iteration. */
-/* { dg-final { scan-tree-dump-not ".* = MEM.*;" "optimized"} } */
+/* { dg-final { scan-tree-dump-not ".* = MEM.*;" "optimized" { xfail {
ia64-*-* arm*-*-* m68k*-*-* sparc*-*-* } } } } */
