[gcc r16-9501] testsuite: Add yet another testcase for float range inverse ops [PR126547]

https://gcc.gnu.org/g:ad7082fb5a1b49d2fd9adc714fab8a3f9a1e19cc

commit r16-9501-gad7082fb5a1b49d2fd9adc714fab8a3f9a1e19cc
Author: Jakub Jelinek <[email protected]>
Date:   Mon Aug 3 13:01:22 2026 +0200

    testsuite: Add yet another testcase for float range inverse ops [PR126547]
    
    This got also fixed with r17-2843.
    
    2026-08-03  Jakub Jelinek  <[email protected]>
    
            PR tree-optimization/126547
            * gcc.dg/torture/pr126547.c: New test.
    
    (cherry picked from commit 81763ec0f01664a5dd9fbfc541b1bf22a857f626)

Diff:
---
 gcc/testsuite/gcc.dg/torture/pr126547.c | 31 +++++++++++++++++++++++++++++++
 1 file changed, 31 insertions(+)

diff --git a/gcc/testsuite/gcc.dg/torture/pr126547.c b/gcc/testsuite/gcc.dg/torture/pr126547.c
new file mode 100644
index 000000000000..c1066a2cfa93
--- /dev/null
+++ b/gcc/testsuite/gcc.dg/torture/pr126547.c
@@ -0,0 +1,31 @@
+/* PR tree-optimization/126547 */
+/* { dg-do run } */
+
+#if __LDBL_HAS_INFINITY__
+[[gnu::noipa]] static int
+foo (long double a1, long double a2)
+{
+  if (a1 >= 1.0 && a1 <= 8.0)
+    {
+      long double d = a1 / a2;
+      int n = 0;
+      if (d >= __builtin_infl ())
+	n += 1;
+      if (a2 > 0.0L)
+	n += 2;
+      return n;
+    }
+  else
+    return -1;
+}
+#endif
+
+int
+main ()
+{
+#if __LDBL_HAS_INFINITY__
+  if (__builtin_isinf (1.0 / __LDBL_DENORM_MIN__)
+      && foo (1.0, __LDBL_DENORM_MIN__) != 3)
+    __builtin_abort ();
+#endif
+}