1 files changed, 29 insertions, 0 deletions
diff --git a/gcc/testsuite/gcc.target/i386/pr37870.c b/gcc/testsuite/gcc.target/i386/pr37870.c
new file mode 100644
index 000000000..19cfb2058
--- /dev/null
+++ b/gcc/testsuite/gcc.target/i386/pr37870.c
@@ -0,0 +1,29 @@
+/* PR middle-end/37870 */
+/* { dg-do run } */
+/* { dg-options "-O2" } */
+
+unsigned int
+foo (long double x)
+{
+  struct { char a[8]; unsigned int b:7; } c;
+  __builtin_memcpy (&c, &x, sizeof (c));
+  return c.b;
+}
+
+unsigned int
+bar (long double x)
+{
+  union { struct { char a[8]; unsigned int b:7; } c; long double d; } u;
+  u.d = x;
+  return u.c.b;
+}
+
+int
+main (void)
+{
+  if (foo (1.245L) != bar (1.245L)
+      || foo (245.67L) != bar (245.67L)
+      || foo (0.00567L) != bar (0.00567L))
+    __builtin_abort ();
+  return 0;
+}