[Assorted-commits] SF.net SVN: assorted:[931] sandbox/trunk/src

[<yan...@us...>]

Revision: 931
          http://assorted.svn.sourceforge.net/assorted/?rev=931&view=rev
Author:   yangzhang
Date:     2008-08-06 08:10:02 +0000 (Wed, 06 Aug 2008)

Log Message:
-----------
- added gcc sandbox
- added profile-guided optimization demo

Added Paths:
-----------
    sandbox/trunk/src/gcc/
    sandbox/trunk/src/gcc/pgo/
    sandbox/trunk/src/gcc/pgo/Makefile
    sandbox/trunk/src/gcc/pgo/README
    sandbox/trunk/src/gcc/pgo/pgodemo.cc

Added: sandbox/trunk/src/gcc/pgo/Makefile
===================================================================
--- sandbox/trunk/src/gcc/pgo/Makefile	                        (rev 0)
+++ sandbox/trunk/src/gcc/pgo/Makefile	2008-08-06 08:10:02 UTC (rev 931)
@@ -0,0 +1,14 @@
+all: out/pgodemo-gen
+
+out/pgodemo-gen: pgodemo.cc
+	mkdir -p $(@D)
+	g++ -Wall -O3 -fprofile-generate -o $@ $^
+
+out/pgodemo-use: pgodemo.cc
+	mkdir -p $(@D)
+	g++ -Wall -O3 -fprofile-use -o $@ $^
+
+clean:
+	rm -rf out/ pgodemo.gc*
+
+.PHONY: all clean

Added: sandbox/trunk/src/gcc/pgo/README
===================================================================
--- sandbox/trunk/src/gcc/pgo/README	                        (rev 0)
+++ sandbox/trunk/src/gcc/pgo/README	2008-08-06 08:10:02 UTC (rev 931)
@@ -0,0 +1,20 @@
+Demo of profile-guided optimization.
+
+`make pgodemo-gen` produces the executable along with `pgodemo.gcno`, whose
+purpose is unclear to me at the moment (removing it doesn't seem to affect any
+future step), but `.gcno` and `.gcda` files appear to be gcov-related.
+
+At this point, you may run the executable, which will produce a `pgodemo.gcda`
+file back in the original build directory (the location of the executable, your
+current working directory at the time of execution, etc. are all irrelevant).
+
+'make pgodemo-use` produces the optimized version of the executable by
+consuming `pgodemo.gcda`.  This will reproduce a new `pgodemo.gcno`.
+
+If you try to build pgodemo-use without the `.gcda` file, you'll get:
+
+  $ make out/pgodemo-use
+  mkdir -p out
+  g++ -Wall -O3 -fprofile-use -o out/pgodemo-use pgodemo.cc
+  pgodemo.cc: In function ‘(static initializers for pgodemo.cc)’:
+  pgodemo.cc:11: note: file pgodemo.gcda not found, execution counts estimated

Added: sandbox/trunk/src/gcc/pgo/pgodemo.cc
===================================================================
--- sandbox/trunk/src/gcc/pgo/pgodemo.cc	                        (rev 0)
+++ sandbox/trunk/src/gcc/pgo/pgodemo.cc	2008-08-06 08:10:02 UTC (rev 931)
@@ -0,0 +1,10 @@
+#include <iostream>
+
+using namespace std;
+
+int
+main()
+{
+  cout << "hello" << endl;
+  return 0;
+}


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