diff --git a/gcc/testsuite/gcc.dg/combine_ashiftrt_1.c b/gcc/testsuite/gcc.dg/combine_ashiftrt_1.c
index 90e64fd10dc358f10ad03a90041605bc3ccb7011..6f92c253ce95ce16bdfd7f943030b77583bb7570 100644
--- a/gcc/testsuite/gcc.dg/combine_ashiftrt_1.c
+++ b/gcc/testsuite/gcc.dg/combine_ashiftrt_1.c
@@ -1,4 +1,7 @@
-/* { dg-do compile {target sparc64*-*-* aarch64*-*-* x86_64-*-* powerpc64*-*-*} } */
+/* Target architectures which have been found to produce the expected RTL
+   (neg:DI (ge:DI ...)) when compiling for ILP32.  */
+/* { dg-do compile {target aarch64*-*-* ia64-*-* i?86-*-* mips*-*-* powerpc*-*-* sparc*-*-* x86_64-*-*} } */
+/* { dg-require-effective-target lp64 } */
 /* { dg-options "-O2 -fdump-rtl-combine-all" } */
 
 typedef long long int int64_t;
diff --git a/gcc/testsuite/gcc.dg/combine_ashiftrt_2.c b/gcc/testsuite/gcc.dg/combine_ashiftrt_2.c
index fd6827caed230ea5dd2d6ec4431b11bf826531ea..c921d62b70681ca1cd0c51ab17c15d6b6c74930d 100644
--- a/gcc/testsuite/gcc.dg/combine_ashiftrt_2.c
+++ b/gcc/testsuite/gcc.dg/combine_ashiftrt_2.c
@@ -1,4 +1,7 @@
-/* { dg-do compile {target arm*-*-* i?86-*-* powerpc-*-* sparc-*-*} } */
+/* Target architectures where RTL has been found to produce the expected
+   (neg:SI (ge:SI ...)) when compiling for ILP32.  */
+/* { dg-do compile {target aarch64*-*-* arm*-*-* i?86-*-* microblaze-*-* mips*-*-* powerpc*-*-* sparc*-*-* x86_64-*-*} } */
+/* { dg-require-effective-target ilp32} */
 /* { dg-options "-O2 -fdump-rtl-combine-all" } */
 
 typedef long int32_t;