1 files changed, 31 insertions, 0 deletions
diff --git a/gcc/testsuite/gcc.dg/pr120638.c b/gcc/testsuite/gcc.dg/pr120638.c
new file mode 100644
index 0000000..4a057a0
--- /dev/null
+++ b/gcc/testsuite/gcc.dg/pr120638.c
@@ -0,0 +1,31 @@
+/* PR tree-optimization/120638 */
+/* { dg-do run } */
+/* { dg-options "-O2 -ffast-math" } */
+
+extern float sqrtf (float x);
+
+__attribute__((noipa)) float
+foo (unsigned int s)
+{
+  return 0.5f / sqrtf (1.f + s);
+}
+
+__attribute__((noipa)) float
+bar (float s)
+{
+  if (s < 0.0 || s > 65535.0f)
+    __builtin_unreachable ();
+  return 0.5f / sqrtf (1.f + s);
+}
+
+int
+main ()
+{
+  if (__builtin_fabsf (foo (3) - 0.25f) > 0.00390625f
+      || __builtin_fabsf (foo (15) - 0.125f) > 0.00390625f
+      || __builtin_fabsf (foo (63) - 0.0625f) > 0.00390625f
+      || __builtin_fabsf (bar (3.0f) - 0.25f) > 0.00390625f
+      || __builtin_fabsf (bar (15.0f) - 0.125f) > 0.00390625f
+      || __builtin_fabsf (bar (63.0f) - 0.0625f) > 0.00390625f)
+    __builtin_abort ();
+}