Commit r12-432, rewriting the dg-stuff, reverted the
adjustment for mmix-knuth-mmixware that I added in r11-2335.
(See those commits for context.)

Hopefully this variant will age better, just skipping it
with a trivial extra line less prone to pile-on.  (Not much
is won by covering this generic case for MMIX too; might as
well skip it.)

Beware that the dg-skip-if text can't say
"temporary variables are not x and y but x::3 and y::4"
because that leads to (on one line):

ERROR: gcc.dg/tree-ssa/ssa-dse-26.c: can't set "{temporary
 variables are not x and y but x::3 and y::4} {
 mmix-knuth-mmixware }": parent namespace doesn't exist for
 " dg-skip-if 4 "temporary variables are not x and y but
 x::3 and y::4" { mmix-knuth-mmixware } "

gcc/testsuite:
        * gcc.dg/tree-ssa/ssa-dse-26.c: Skip on mmix-knuth-mmixware.
---
 gcc/testsuite/gcc.dg/tree-ssa/ssa-dse-26.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/gcc/testsuite/gcc.dg/tree-ssa/ssa-dse-26.c 
b/gcc/testsuite/gcc.dg/tree-ssa/ssa-dse-26.c
index 5eabfb464d3c..e3c33f49ef60 100644
--- a/gcc/testsuite/gcc.dg/tree-ssa/ssa-dse-26.c
+++ b/gcc/testsuite/gcc.dg/tree-ssa/ssa-dse-26.c
@@ -1,6 +1,7 @@
 /* { dg-do compile } */
 /* { dg-options "-O2 -fdump-tree-dse1-details -fno-short-enums -fno-tree-fre" 
} */
 /* { dg-skip-if "we want a BIT_FIELD_REF from fold_truth_andor" { ! lp64 } } */
+/* { dg-skip-if "temporary variable names are not x and y" { 
mmix-knuth-mmixware } } */

 enum constraint_expr_type
 {
-- 
2.20.1

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