PR68474: Fix tree-call-cdce.c:use_internal_fn

[Richard Sandiford]

We'd call gen_shrink_wrap_conditions for functions that it can't handle
but edom_only_function can.

Tested on x86_64-linux-gnu.  OK to install?

Thanks,
Richard


gcc/
        PR tree-optimization/68474
        * tree-call-cdce.c (use_internal_fn): Protect call to
        gen_shrink_wrap_conditions.

gcc/testsuite/
        PR tree-optimization/68474
        * gcc.dg/pr68474.c: New test.

diff --git a/gcc/testsuite/gcc.dg/pr68474.c b/gcc/testsuite/gcc.dg/pr68474.c
new file mode 100644
index 0000000..8ad7def
--- /dev/null
+++ b/gcc/testsuite/gcc.dg/pr68474.c
@@ -0,0 +1,7 @@
+/* { dg-options "-O -funsafe-math-optimizations" } */
+
+long double
+foo (long double d1, long double d2)
+{
+  return d1 || __builtin_significandl (d2);
+}
diff --git a/gcc/tree-call-cdce.c b/gcc/tree-call-cdce.c
index 75ef180..4123130 100644
--- a/gcc/tree-call-cdce.c
+++ b/gcc/tree-call-cdce.c
@@ -959,7 +959,8 @@ use_internal_fn (gcall *call)
 {
   unsigned nconds = 0;
   auto_vec<gimple *, 12> conds;
-  gen_shrink_wrap_conditions (call, conds, &nconds);
+  if (can_test_argument_range (call))
+    gen_shrink_wrap_conditions (call, conds, &nconds);
   if (nconds == 0 && !edom_only_function (call))
     return false;