Looks like MMIX is the "correct target" too (cf. 2f6bdd51cfe15) and from https://gcc.gnu.org/pipermail/gcc-testresults/2021-July/710188.html it seems powerpc-ibm-aix7.2.3.0 is too, but I've not found other targets failing.
gcc/testsuite: PR middle-end/101674 * gcc.dg/uninit-pred-9_b.c: Xfail for mmix-*-* too. --- gcc/testsuite/gcc.dg/uninit-pred-9_b.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/gcc/testsuite/gcc.dg/uninit-pred-9_b.c b/gcc/testsuite/gcc.dg/uninit-pred-9_b.c index e0dc21405f7d..9383c559507c 100644 --- a/gcc/testsuite/gcc.dg/uninit-pred-9_b.c +++ b/gcc/testsuite/gcc.dg/uninit-pred-9_b.c @@ -20,7 +20,7 @@ int foo (int n, int l, int m, int r) blah(v); /* { dg-bogus "uninitialized" "bogus warning" } */ if ( (n <= 8) && (m < 99) && (r < 19) ) - blah(v); /* { dg-bogus "uninitialized" "pr101674" { xfail powerpc64*-*-* } } */ + blah(v); /* { dg-bogus "uninitialized" "pr101674" { xfail powerpc64*-*-* mmix-*-* } } */ return 0; } -- 2.20.1