diff --git a/compiler-rt/lib/builtins/arm/aeabi_cdcmp.S b/compiler-rt/lib/builtins/arm/aeabi_cdcmp.S
--- a/compiler-rt/lib/builtins/arm/aeabi_cdcmp.S
+++ b/compiler-rt/lib/builtins/arm/aeabi_cdcmp.S
@@ -8,10 +8,6 @@
 
 #include "../assembly.h"
 
-#if __BYTE_ORDER__ != __ORDER_LITTLE_ENDIAN__
-#error big endian support not implemented
-#endif
-
 #define APSR_Z (1 << 30)
 #define APSR_C (1 << 29)
 
diff --git a/compiler-rt/lib/builtins/arm/aeabi_cfcmp.S b/compiler-rt/lib/builtins/arm/aeabi_cfcmp.S
--- a/compiler-rt/lib/builtins/arm/aeabi_cfcmp.S
+++ b/compiler-rt/lib/builtins/arm/aeabi_cfcmp.S
@@ -8,10 +8,6 @@
 
 #include "../assembly.h"
 
-#if __BYTE_ORDER__ != __ORDER_LITTLE_ENDIAN__
-#error big endian support not implemented
-#endif
-
 #define APSR_Z (1 << 30)
 #define APSR_C (1 << 29)
 
diff --git a/compiler-rt/test/builtins/Unit/arm/call_apsr.h b/compiler-rt/test/builtins/Unit/arm/call_apsr.h
--- a/compiler-rt/test/builtins/Unit/arm/call_apsr.h
+++ b/compiler-rt/test/builtins/Unit/arm/call_apsr.h
@@ -1,21 +1,34 @@
 #ifndef CALL_APSR_H
 #define CALL_APSR_H
 
-#if __BYTE_ORDER__ != __ORDER_LITTLE_ENDIAN__
-#error big endian support not implemented
-#endif
+#if __BYTE_ORDER__ == __ORDER_LITTLE_ENDIAN__
 
 union cpsr {
-    struct {
-        uint32_t filler: 28;
-        uint32_t v: 1;
-        uint32_t c: 1;
-        uint32_t z: 1;
-        uint32_t n: 1;
-    } flags;
-    uint32_t value;
+  struct {
+    uint32_t filler : 28;
+    uint32_t v : 1;
+    uint32_t c : 1;
+    uint32_t z : 1;
+    uint32_t n : 1;
+  } flags;
+  uint32_t value;
 };
 
+#else
+
+union cpsr {
+  struct {
+    uint32_t n : 1;
+    uint32_t z : 1;
+    uint32_t c : 1;
+    uint32_t v : 1;
+    uint32_t filler : 28;
+  } flags;
+  uint32_t value;
+};
+
+#endif
+
 __attribute__((noinline, pcs("aapcs"))) static uint32_t call_apsr_f(float a, float b,
                                                                     __attribute__((pcs("aapcs"))) void (*fn)(float, float)) {
   uint32_t result;