1 files changed, 54 insertions, 0 deletions
diff --git a/SingleSource/Regression/C/gcc-c-torture/execute/bitfld-1.c b/SingleSource/Regression/C/gcc-c-torture/execute/bitfld-1.c
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index 00000000..cb9ef2b9
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+++ b/SingleSource/Regression/C/gcc-c-torture/execute/bitfld-1.c
@@ -0,0 +1,54 @@
+/* Copyright 2002 Free Software Foundation, Inc.
+
+   Tests correct signedness of operations on bitfields; in particular
+   that integer promotions are done correctly, including the case when
+   casts are present.
+
+   The C front end was eliding the cast of an unsigned bitfield to
+   unsigned as a no-op, when in fact it forces a conversion to a
+   full-width unsigned int. (At the time of writing, the C++ front end
+   has a different bug; it erroneously promotes the uncast unsigned
+   bitfield to an unsigned int).
+
+   Source: Neil Booth, 25 Jan 2002, based on PR 3325 (and 3326, which
+   is a different manifestation of the same bug).
+*/
+
+extern void abort ();
+
+int
+main(int argc, char *argv[])
+{
+  struct x { signed int i : 7; unsigned int u : 7; } bit;
+
+  unsigned int u;
+  int i;
+  unsigned int unsigned_result = -13U % 61;
+  int signed_result = -13 % 61;
+
+  bit.u = 61, u = 61;
+  bit.i = -13, i = -13;
+
+  if (i % u != unsigned_result)
+    abort ();
+  if (i % (unsigned int) u != unsigned_result)
+    abort ();
+
+  /* Somewhat counter-intuitively, bit.u is promoted to an int, making
+     the operands and result an int.  */
+  if (i % bit.u != signed_result)
+    abort ();
+
+  if (bit.i % bit.u != signed_result)
+    abort ();
+
+  /* But with a cast to unsigned int, the unsigned int is promoted to
+     itself as a no-op, and the operands and result are unsigned.  */
+  if (i % (unsigned int) bit.u != unsigned_result)
+    abort ();
+
+  if (bit.i % (unsigned int) bit.u != unsigned_result)
+    abort ();
+
+  return 0;
+}