diff --git a/gcc/c-family/c-gimplify.cc b/gcc/c-family/c-gimplify.cc
index 0aad93e618cb..8fbf6e495096 100644
--- a/gcc/c-family/c-gimplify.cc
+++ b/gcc/c-family/c-gimplify.cc
@@ -1013,6 +1013,10 @@ c_gimplify_expr (tree *expr_p, gimple_seq *pre_p ATTRIBUTE_UNUSED,
 	    if (gimplify_expr (&a, pre_p, post_p, is_gimple_val, fb_rvalue)
 		== GS_ERROR)
 	      return GS_ERROR;
+	    tree b = CALL_EXPR_ARG (*expr_p, 1);
+	    if (gimplify_expr (&b, pre_p, post_p, is_gimple_val, fb_rvalue)
+		== GS_ERROR)
+	      return GS_ERROR;
 	    tree c = build_call_expr_loc (EXPR_LOCATION (*expr_p),
 					  fndecl, 1, a);
 	    *expr_p = build3_loc (EXPR_LOCATION (*expr_p), COND_EXPR,
@@ -1020,7 +1024,7 @@ c_gimplify_expr (tree *expr_p, gimple_seq *pre_p ATTRIBUTE_UNUSED,
 				  build2_loc (EXPR_LOCATION (*expr_p),
 					      NE_EXPR, boolean_type_node, a,
 					      build_zero_cst (TREE_TYPE (a))),
-				  c, CALL_EXPR_ARG (*expr_p, 1));
+				  c, b);
 	    return GS_OK;
 	  }
 	break;
diff --git a/gcc/testsuite/gcc.dg/torture/pr122188.c b/gcc/testsuite/gcc.dg/torture/pr122188.c
new file mode 100644
index 000000000000..2c549630f9de
--- /dev/null
+++ b/gcc/testsuite/gcc.dg/torture/pr122188.c
@@ -0,0 +1,33 @@
+/* PR c/122188 */
+/* { dg-do run } */
+
+int
+foo (unsigned x, int y)
+{
+  unsigned a = x;
+  int b = y;
+  int ret = __builtin_ctzg (x++, y++);
+  if (x != a + 1 || y != b + 1)
+    __builtin_abort ();
+  return ret;
+}
+
+int
+bar (unsigned x, int y)
+{
+  unsigned a = x;
+  int b = y;
+  int ret = __builtin_clzg (x++, y++);
+  if (x != a + 1 || y != b + 1)
+    __builtin_abort ();
+  return ret;
+}
+
+int
+main ()
+{
+  if (foo (0, 42) != 42 || foo (1, 5) != 0 || foo (4, 17) != 2)
+    __builtin_abort ();
+  if (bar (0, 42) != 42 || bar (~0U, 5) != 0 || bar (~0U >> 4, 17) != 4)
+    __builtin_abort ();
+}