obtained gcc-4.6.4.tar.bz2 from upstream website;upstream

verified gcc-4.6.4.tar.bz2.sig;
imported gcc-4.6.4 source tree from verified upstream tarball.

downloading a git-generated archive based on the 'upstream' tag
should provide you with a source tree that is binary identical
to the one extracted from the above tarball.

if you have obtained the source via the command 'git clone',
however, do note that line-endings of files in your working
directory might differ from line-endings of the respective
files in the upstream repository.

1 files changed, 147 insertions, 0 deletions

diff --git a/gcc/testsuite/gcc.c-torture/execute/20040703-1.c b/gcc/testsuite/gcc.c-torture/execute/20040703-1.c
new file mode 100644
index 000000000..eba358d35
--- /dev/null
+++ b/gcc/testsuite/gcc.c-torture/execute/20040703-1.c
@@ -0,0 +1,147 @@
+/* PR 16341 */
+
+#define PART_PRECISION (sizeof (cpp_num_part) * 8)
+
+typedef unsigned int cpp_num_part;
+typedef struct cpp_num cpp_num;
+struct cpp_num
+{
+   cpp_num_part high;
+   cpp_num_part low;
+   int unsignedp;  /* True if value should be treated as unsigned.  */
+   int overflow;   /* True if the most recent calculation overflowed.  */
+};
+
+static  int
+num_positive (cpp_num num, unsigned int precision)
+{
+   if (precision > PART_PRECISION)
+     {
+       precision -= PART_PRECISION;
+       return (num.high & (cpp_num_part) 1 << (precision - 1)) == 0;
+     }
+
+   return (num.low & (cpp_num_part) 1 << (precision - 1)) == 0;
+}
+
+static cpp_num
+num_trim (cpp_num num, unsigned int precision)
+{
+   if (precision > PART_PRECISION)
+     {
+       precision -= PART_PRECISION;
+       if (precision < PART_PRECISION)
+         num.high &= ((cpp_num_part) 1 << precision) - 1;
+     }
+   else
+     {
+       if (precision < PART_PRECISION)
+         num.low &= ((cpp_num_part) 1 << precision) - 1;
+       num.high = 0;
+     }
+
+   return num;
+}
+
+/* Shift NUM, of width PRECISION, right by N bits.  */
+static cpp_num
+num_rshift (cpp_num num, unsigned int precision, unsigned int n)
+{
+   cpp_num_part sign_mask;
+   int x = num_positive (num, precision);
+
+   if (num.unsignedp || x)
+     sign_mask = 0;
+   else
+     sign_mask = ~(cpp_num_part) 0;
+
+   if (n >= precision)
+     num.high = num.low = sign_mask;
+   else
+     {
+       /* Sign-extend.  */
+       if (precision < PART_PRECISION)
+         num.high = sign_mask, num.low |= sign_mask << precision;
+       else if (precision < 2 * PART_PRECISION)
+         num.high |= sign_mask << (precision - PART_PRECISION);
+
+       if (n >= PART_PRECISION)
+         {
+           n -= PART_PRECISION;
+           num.low = num.high;
+           num.high = sign_mask;
+         }
+
+       if (n)
+         {
+           num.low = (num.low >> n) | (num.high << (PART_PRECISION - n));
+           num.high = (num.high >> n) | (sign_mask << (PART_PRECISION - n));
+         }
+     }
+
+   num = num_trim (num, precision);
+   num.overflow = 0;
+   return num;
+}
+                              #define num_zerop(num) ((num.low | num.high) == 0)
+#define num_eq(num1, num2) (num1.low == num2.low && num1.high == num2.high)
+
+cpp_num
+num_lshift (cpp_num num, unsigned int precision, unsigned int n)
+{
+   if (n >= precision)
+     {
+       num.overflow = !num.unsignedp && !num_zerop (num);
+       num.high = num.low = 0;
+     }
+   else
+     {
+       cpp_num orig;
+       unsigned int m = n;
+
+       orig = num;
+       if (m >= PART_PRECISION)
+         {
+           m -= PART_PRECISION;
+           num.high = num.low;
+           num.low = 0;
+         }
+       if (m)
+         {
+           num.high = (num.high << m) | (num.low >> (PART_PRECISION - m));
+           num.low <<= m;
+         }
+       num = num_trim (num, precision);
+
+       if (num.unsignedp)
+         num.overflow = 0;
+       else
+         {
+           cpp_num maybe_orig = num_rshift (num, precision, n);
+           num.overflow = !num_eq (orig, maybe_orig);
+         }
+     }
+
+   return num;
+}
+
+unsigned int precision = 64;
+unsigned int n = 16;
+
+cpp_num num = { 0, 3, 0, 0 };
+
+int main()
+{
+   cpp_num res = num_lshift (num, 64, n);
+
+   if (res.low != 0x30000)
+     abort ();
+
+   if (res.high != 0)
+     abort ();
+
+   if (res.overflow != 0)
+     abort ();
+
+   exit (0);
+}