diff --git a/regressions/ck_pr/validate/ck_pr_add.c b/regressions/ck_pr/validate/ck_pr_add.c
index 5f2ce87..755a1c3 100644
--- a/regressions/ck_pr/validate/ck_pr_add.c
+++ b/regressions/ck_pr/validate/ck_pr_add.c
@@ -84,6 +84,11 @@ static void
 rg_width(int m)
 {
 
+	/* Other architectures are bi-endian. */
+#if !defined(__x86__) && !defined(__x86_64__)
+	return;
+#endif
+
 #ifdef CK_F_PR_ADD_64
 	if (m == 64) {
 #if defined(CK_F_PR_ADD_32)
diff --git a/regressions/ck_pr/validate/ck_pr_and.c b/regressions/ck_pr/validate/ck_pr_and.c
index e525db9..792ffe9 100644
--- a/regressions/ck_pr/validate/ck_pr_and.c
+++ b/regressions/ck_pr/validate/ck_pr_and.c
@@ -80,6 +80,11 @@ static void
 rg_width(int m)
 {
 
+	/* Other architectures are bi-endian. */
+#if !defined(__x86__) && !defined(__x86_64__)
+	return;
+#endif
+
 #ifdef CK_F_PR_AND_64
 	if (m == 64) {
 #if defined(CK_F_PR_AND_32)
diff --git a/regressions/ck_pr/validate/ck_pr_dec.c b/regressions/ck_pr/validate/ck_pr_dec.c
index b4e43bd..6898c34 100644
--- a/regressions/ck_pr/validate/ck_pr_dec.c
+++ b/regressions/ck_pr/validate/ck_pr_dec.c
@@ -76,6 +76,11 @@ static void
 rg_width(int m)
 {
 
+	/* Other architectures are bi-endian. */
+#if !defined(__x86__) && !defined(__x86_64__)
+	return;
+#endif
+
 #ifdef CK_F_PR_DEC_64
 	if (m == 64) {
 #if defined(CK_F_PR_DEC_32)
diff --git a/regressions/ck_pr/validate/ck_pr_fas.c b/regressions/ck_pr/validate/ck_pr_fas.c
index 4e9fca6..56d674f 100644
--- a/regressions/ck_pr/validate/ck_pr_fas.c
+++ b/regressions/ck_pr/validate/ck_pr_fas.c
@@ -81,6 +81,11 @@ static void
 rg_width(int m)
 {
 
+	/* Other architectures are bi-endian. */
+#if !defined(__x86__) && !defined(__x86_64__)
+	return;
+#endif
+
 #ifdef CK_F_PR_FAS_64
 	if (m == 64) {
 #if defined(CK_F_PR_FAS_32)
diff --git a/regressions/ck_pr/validate/ck_pr_inc.c b/regressions/ck_pr/validate/ck_pr_inc.c
index d633465..62afc33 100644
--- a/regressions/ck_pr/validate/ck_pr_inc.c
+++ b/regressions/ck_pr/validate/ck_pr_inc.c
@@ -76,6 +76,11 @@ static void
 rg_width(int m)
 {
 
+	/* Other architectures are bi-endian. */
+#if !defined(__x86__) && !defined(__x86_64__)
+	return;
+#endif
+
 #ifdef CK_F_PR_INC_64
 	if (m == 64) {
 #if defined(CK_F_PR_INC_32)
diff --git a/regressions/ck_pr/validate/ck_pr_load.c b/regressions/ck_pr/validate/ck_pr_load.c
index badcb76..c112b81 100644
--- a/regressions/ck_pr/validate/ck_pr_load.c
+++ b/regressions/ck_pr/validate/ck_pr_load.c
@@ -76,6 +76,11 @@ static void
 rg_width(int m)
 {
 
+	/* Other architectures are bi-endian. */
+#if !defined(__x86__) && !defined(__x86_64__)
+	return;
+#endif
+
 #ifdef CK_F_PR_LOAD_64
 	if (m == 64) {
 #if defined(CK_F_PR_LOAD_32)
diff --git a/regressions/ck_pr/validate/ck_pr_or.c b/regressions/ck_pr/validate/ck_pr_or.c
index c0b25ef..37f552d 100644
--- a/regressions/ck_pr/validate/ck_pr_or.c
+++ b/regressions/ck_pr/validate/ck_pr_or.c
@@ -80,6 +80,11 @@ static void
 rg_width(int m)
 {
 
+	/* Other architectures are bi-endian. */
+#if !defined(__x86__) && !defined(__x86_64__)
+	return;
+#endif
+
 #ifdef CK_F_PR_OR_64
 	if (m == 64) {
 #if defined(CK_F_PR_OR_32)
diff --git a/regressions/ck_pr/validate/ck_pr_sub.c b/regressions/ck_pr/validate/ck_pr_sub.c
index 2cd316e..d6303ba 100644
--- a/regressions/ck_pr/validate/ck_pr_sub.c
+++ b/regressions/ck_pr/validate/ck_pr_sub.c
@@ -84,6 +84,11 @@ static void
 rg_width(int m)
 {
 
+	/* Other architectures are bi-endian. */
+#if !defined(__x86__) && !defined(__x86_64__)
+	return;
+#endif
+
 #ifdef CK_F_PR_SUB_64
 	if (m == 64) {
 #if defined(CK_F_PR_SUB_32)
diff --git a/regressions/ck_pr/validate/ck_pr_xor.c b/regressions/ck_pr/validate/ck_pr_xor.c
index 6c88c39..e395cfe 100644
--- a/regressions/ck_pr/validate/ck_pr_xor.c
+++ b/regressions/ck_pr/validate/ck_pr_xor.c
@@ -80,6 +80,11 @@ static void
 rg_width(int m)
 {
 
+	/* Other architectures are bi-endian. */
+#if !defined(__x86__) && !defined(__x86_64__)
+	return;
+#endif
+
 #ifdef CK_F_PR_XOR_64
 	if (m == 64) {
 #if defined(CK_F_PR_XOR_32)