As discussed in the PR and referenced by the comment in the testcase itself, the failure is expected on PowerPC and also occurs on SPARC.
Thanks, David * gcc.dg/tree-ssa/ssa-dom-cse-2.c: XFAIL for powerpc*-*-* and sparc*-*-*. Index: ssa-dom-cse-2.c =================================================================== --- ssa-dom-cse-2.c (revision 220256) +++ ssa-dom-cse-2.c (working copy) @@ -20,5 +20,5 @@ /* See PR63679, if the target forces the initializer to memory then DOM is not able to perform this optimization. */ -/* { dg-final { scan-tree-dump "return 28;" "optimized" { xfail hppa*-*-* } } } */ +/* { dg-final { scan-tree-dump "return 28;" "optimized" { xfail hppa*-*-* powerpc*-*-* sparc*-*-*} } } */ /* { dg-final { cleanup-tree-dump "optimized" } } */