Index: gcc/config/arm/arm.md
===================================================================
--- gcc/config/arm/arm.md	(revision 181985)
+++ gcc/config/arm/arm.md	(working copy)
@@ -3413,7 +3413,7 @@
     bool need_else;
 
     if (which_alternative != 0 || operands[3] != const0_rtx
-        || (code != PLUS && code != MINUS && code != IOR && code != XOR))
+        || (code != PLUS && code != IOR && code != XOR))
       need_else = true;
     else
       need_else = false;
Index: gcc/testsuite/gcc.dg/pr51408.c
===================================================================
--- gcc/testsuite/gcc.dg/pr51408.c	(revision 0)
+++ gcc/testsuite/gcc.dg/pr51408.c	(revision 0)
@@ -0,0 +1,22 @@
+/* This testcase used to fail because of a bug in 
+   arm.md:*minmax_arithsi.  */
+
+/* { dg-do run } */
+/* { dg-options "-O1" } */
+
+extern void abort (void);
+
+int __attribute__((noinline))
+foo (int a, int b)
+{
+  int max = (b > 0) ? b : 0;
+  return max - a;
+}
+
+int
+main (void)
+{
+  if (foo (3, -1) != -3)
+    abort ();
+  return 0;
+}