diff --git a/compiler-rt/lib/builtins/ucmpdi2.c b/compiler-rt/lib/builtins/ucmpdi2.c
--- a/compiler-rt/lib/builtins/ucmpdi2.c
+++ b/compiler-rt/lib/builtins/ucmpdi2.c
@@ -17,23 +17,11 @@
 //           if (a >  b) returns 2
 
 COMPILER_RT_ABI si_int __ucmpdi2(du_int a, du_int b) {
-  udwords x;
-  x.all = a;
-  udwords y;
-  y.all = b;
-  if (x.s.high < y.s.high)
-    return 0;
-  if (x.s.high > y.s.high)
-    return 2;
-  if (x.s.low < y.s.low)
-    return 0;
-  if (x.s.low > y.s.low)
-    return 2;
-  return 1;
+  return (a > b) - (a < b) + 1;
 }
 
 #ifdef __ARM_EABI__
-// Returns: if (a <  b) returns -1
+// Returns:  if (a <  b) returns -1
 //           if (a == b) returns  0
 //           if (a >  b) returns  1
 COMPILER_RT_ABI si_int __aeabi_ulcmp(di_int a, di_int b) {