invoke.texi (-a): Remove documentation.

	* doc/invoke.texi (-a): Remove documentation.
	(-fprofile-arcs): Remove reference to -a, -ax options.
	* doc/gcov.texi (Gcov Data Files): Data might be merged.

From-SVN: r56331

gcc/ChangeLog

+2002-08-14  Nathan Sidwell  <nathan@codesourcery.com>
+
+	* doc/invoke.texi (-a): Remove documentation.
+	(-fprofile-arcs): Remove reference to -a, -ax options.
+	* doc/gcov.texi (Gcov Data Files): Data might be merged.
+
 2002-08-14  Gabriel Dos Reis  <gdr@nerim.net>
 
 	Fix PR/7566
@@ -606,7 +612,7 @@ Sat Aug 10 19:59:43 CEST 2002  Jan Hubicka  <jh@suse.cz>
 	(end_branch_prob): Remove da file.
 
 	* Makefile.in (stage1_build): Pass empty COVERAGE_FLAGS.
-	* configure.in (coverage_flags) default to nothing.
+	* configure.in (coverage_flags): Default to nothing.
 	* configure: Rebuilt.
 
 2002-08-09  Neil Booth  <neil@daikokuya.co.uk>

gcc/doc/gcov.texi

@@ -464,10 +464,10 @@ built with the GCC @option{-fprofile-arcs} option is executed.  A
 separate @file{.da} file is created for each source file compiled with
 this option, and the name of the @file{.da} file is stored as an
 absolute pathname in the resulting object file.  This path name is
-derived from the source file name by substituting a @file{.da} suffix.
+derived from the object file name by substituting a @file{.da} suffix.
 
-The @file{.da} consists of several blocks (one for each run) with the
-following structure:
+The @file{.da} consists of one or more blocks with the following
+structure:
 @smallexample
         "magic" number @minus{}123 (4-byte number)
 	number of functions (4-byte number)
@@ -484,7 +484,9 @@ following structure:
         checksum of function #1
 	@dots{}
 @end smallexample
-The current structure of the extension block is as follows:
+Multiple program runs might merge data into a single block, or might
+append a new block. The current structure of the extension block is as
+follows:
 @smallexample
         number of instrumented arcs in whole program (4-byte number)
         sum all of instrumented arcs in whole program (8-byte number)

gcc/doc/invoke.texi

@@ -2795,20 +2795,6 @@ analysis program @code{gprof}.  You must use this option when compiling
 the source files you want data about, and you must also use it when
 linking.
 
-@cindex @code{tcov}
-@item -a
-@opindex a
-Generate extra code to write profile information for basic blocks, which will
-record the number of times each basic block is executed, the basic block start
-address, and the function name containing the basic block.  If @option{-g} is
-used, the line number and filename of the start of the basic block will also be
-recorded.  If not overridden by the machine description, the default action is
-to append to the text file @file{bb.out}.
-
-This data could be analyzed by a program like @code{tcov}.  Note,
-however, that the format of the data is not what @code{tcov} expects.
-Eventually GNU @code{gprof} should be extended to process this data.
-
 @item -Q
 @opindex Q
 Makes the compiler print out each function name as it is compiled, and
@@ -2846,18 +2832,7 @@ optimization and code generation options plus
 Control Optimization}).
 
 The other use of @option{-fprofile-arcs} is for use with @code{gcov},
-when it is used with the @option{-ftest-coverage} option.  GCC
-supports two methods of determining code coverage: the options that
-support @code{gcov}, and options @option{-a} and @option{-ax}, which
-write information to text files.  The options that support @code{gcov}
-do not need to instrument every arc in the program, so a program compiled
-with them runs faster than a program compiled with @option{-a}, which
-adds instrumentation code to every basic block in the program.  The
-tradeoff: since @code{gcov} does not have execution counts for all
-branches, it must start with the execution counts for the instrumented
-branches, and then iterate over the program flow graph until the entire
-graph has been solved.  Hence, @code{gcov} runs a little more slowly than
-a program which uses information from @option{-a} and @option{-ax}.
+when it is used with the @option{-ftest-coverage} option.
 
 With @option{-fprofile-arcs}, for each function of your program GCC
 creates a program flow graph, then finds a spanning tree for the graph.
@@ -2867,11 +2842,6 @@ executed.  When an arc is the only exit or only entrance to a block, the
 instrumentation code can be added to the block; otherwise, a new basic
 block must be created to hold the instrumentation code.
 
-This option makes it possible to estimate branch probabilities and to
-calculate basic block execution counts.  In general, basic block
-execution counts as provided by @option{-a} do not give enough
-information to estimate all branch probabilities.
-
 @need 2000
 @item -ftest-coverage
 @opindex ftest-coverage