Implement multi-bit aligned accessors for sparse bitmap.

Provide set/get routines to allow sparse bitmaps to be treated as an array
of multiple bit values. Only chunk sizes that are powers of 2 are supported.

	* bitmap.c (bitmap_set_aligned_chunk): New.
	(bitmap_get_aligned_chunk): New.
	(test_aligned_chunk): New.
	(bitmap_c_tests): Call test_aligned_chunk.
	* bitmap.h (bitmap_set_aligned_chunk, bitmap_get_aligned_chunk): New.

1 files changed, 7 insertions, 0 deletions

diff --git a/gcc/bitmap.h b/gcc/bitmap.h
index 2613855..0846f79 100644
--- a/gcc/bitmap.h
+++ b/gcc/bitmap.h
@@ -438,6 +438,13 @@ extern bool bitmap_set_bit (bitmap, int);
 /* Return true if a bit is set in a bitmap.  */
 extern int bitmap_bit_p (const_bitmap, int);
 
+/* Set and get multiple bit values in a sparse bitmap.  This allows a bitmap to
+   function as a sparse array of bit patterns where the patterns are
+   multiples of power of 2. This is more efficient than performing this as
+   multiple individual operations.  */
+void bitmap_set_aligned_chunk (bitmap, unsigned int, unsigned int, BITMAP_WORD);
+BITMAP_WORD bitmap_get_aligned_chunk (const_bitmap, unsigned int, unsigned int);
+
 /* Debug functions to print a bitmap.  */
 extern void debug_bitmap (const_bitmap);
 extern void debug_bitmap_file (FILE *, const_bitmap);