invoke.texi (-profile-arcs): Remove references to -a and -ax.

2002-10-29  Janis Johnson  <janis187@us.ibm.com>

	* doc/invoke.texi (-profile-arcs): Remove references to -a and -ax.

From-SVN: r58626

diff --git a/gcc/ChangeLog b/gcc/ChangeLog
index 33b313ff3fa00216246d7fc9873cb346fb2896ae..928a9874ec55be8dddc1d61274710e3d8984dcc2 100644 (file)
--- a/gcc/ChangeLog
+++ b/gcc/ChangeLog
@@ -1,3 +1,7 @@
+2002-10-29  Janis Johnson  <janis187@us.ibm.com>
+
+       * doc/invoke.texi (-profile-arcs): Remove references to -a and -ax.
+
 2002-10-29  Eric Botcazou  <ebotcazou@libertysurf.fr>
 
        * expr.c (expand_expr) [PLUS]: Don't use simplify_binary_operation;

diff --git a/gcc/doc/invoke.texi b/gcc/doc/invoke.texi
index 10ced6b06b98edca64e7e892312fdd0a2e51d73c..0b527b2598f0f090939064307e6fc4104836a22a 100644 (file)
--- a/gcc/doc/invoke.texi
+++ b/gcc/doc/invoke.texi
@@ -2933,18 +2933,7 @@ 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.
@@ -2954,11 +2943,6 @@ 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