coverage.c (bbg_file_stamp): New.

	* coverage.c (bbg_file_stamp): New.
	(read_counts_file): Merge incoming stamp with bbg_file_stamp.
	(build_info): Write bbg_file_stamp.
	(coverage_init): Initialize bbg_file_stamp.  Read counts file
	before writing graph header.
	(coverage_finish): Don't unlink the data file if we can generate a
	unique file stamp.
	* tree.h (crc32_unsigned): Declare.
	* tree.c (crc32_unsigned_bits): New, broken out of ...
	(crc32_byte): ... here.  Use it.
	(crc32_unsigned): New.

From-SVN: r189095

1 files changed, 26 insertions, 12 deletions

diff --git a/gcc/tree.c b/gcc/tree.c
index 1717d713698..5aa5399d7d1 100644
--- a/gcc/tree.c
+++ b/gcc/tree.c
@@ -8738,23 +8738,37 @@ dump_tree_statistics (void)
 
 /* Generate a crc32 of a byte.  */
 
-unsigned
-crc32_byte (unsigned chksum, char byte)
+static unsigned
+crc32_unsigned_bits (unsigned chksum, unsigned value, unsigned bits)
 {
-  unsigned value = (unsigned) byte << 24;
-      unsigned ix;
-
-      for (ix = 8; ix--; value <<= 1)
-  	{
-  	  unsigned feedback;
+  unsigned ix;
 
-  	  feedback = (value ^ chksum) & 0x80000000 ? 0x04c11db7 : 0;
- 	  chksum <<= 1;
- 	  chksum ^= feedback;
-  	}
+  for (ix = bits; ix--; value <<= 1)
+    {
+      unsigned feedback;
+      
+      feedback = (value ^ chksum) & 0x80000000 ? 0x04c11db7 : 0;
+      chksum <<= 1;
+      chksum ^= feedback;
+    }
   return chksum;
 }
 
+/* Generate a crc32 of a 32-bit unsigned.  */
+
+unsigned
+crc32_unsigned (unsigned chksum, unsigned value)
+{
+  return crc32_unsigned_bits (chksum, value, 32);
+}
+
+/* Generate a crc32 of a byte.  */
+
+unsigned
+crc32_byte (unsigned chksum, char byte)
+{
+  return crc32_unsigned_bits (chksum, (unsigned) byte << 24, 8);
+}
 
 /* Generate a crc32 of a string.  */