initial commit

Signed-off-by: Victor Rodriguez <victor.rodriguez.bahena@intel.com>

README

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+Make FMV patches
+
+The Clear Linux project is currently focusing on applying FMV technology to
+packages where it is detected that AVX instructions can yield an improvement.
+To solve some of the issues involved with supporting FMV in a full Linux
+distribution, the project provides a patch generator based on
+vectorization-candidate detection (using the -fopt-info-vec flag). This tool
+can provide all the FMV patches that a Linux distribution might use
+
+----------------------
+Command Line Arguments
+----------------------
+
+Example: perl make-fmv-patch.pl <buildlog> <sourcecode>
+    
+    buildlog: Build of the compilation of source code in gcc using the
+    ``-fopt-info-vec`` flag
+    sourcecode: Absolute path to the source file from where patches will be
+    generated
+

make-fmv-patch.pl

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+#!/usr/bin/perl
+
+# Copyright (c) 2016, Intel Corporation
+
+# Permission is hereby granted, free of charge, to any person obtaining a copy
+# of this software and associated documentation files (the "Software"), to deal
+# in the Software without restriction, including without limitation the rights
+# to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+# copies of the Software, and to permit persons to whom the Software is
+# furnished to do so, subject to the following conditions:
+
+# The above copyright notice and this permission notice shall be included in
+# all copies or substantial portions of the Software.
+
+# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+# IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+# FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+# AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+# LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+# OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+# THE SOFTWARE.
+
+
+# This program will make its best effort on finding the candidates sources for FMV
+# patch them and create a bunch of ready to apply patches.
+
+# USAGE: perl fmvpatches.pl <path_to_logfile> <full_path_to_source_code>
+
+
+my %f;
+my $fmv = {};
+my ($log_file, $source_path) = @ARGV;
+
+sub patch_function {
+    my $avx2 = '__attribute__((target_clones("avx2","arch=atom","default")))'."\n";
+    my ($file,@patch_line) = @_;
+    my $patch_file = "$file"."~";
+
+    print "patching $file @ lines \(@patch_line\)\n";
+    open(my $in, "<", $file) or die "$! - $file\n";
+    open(my $out, ">","$patch_file") or die __LINE__," - $!\n";
+
+    foreach (@patch_line) {
+        my $line_num =  $_;
+
+        while( <$in> ) {
+            print $out $_;
+            last if $. == ($line_num - 1);
+        }
+
+        print $out $avx2;
+    }
+    while( <$in> ) {
+        print $out $_;
+    }
+
+    close $out;
+    close $in;
+
+    my $diff = `diff -su $file $patch_file`;
+    open (my $d,">","$file.patch") or die __LINE__," - $!\n";
+    print $d $diff;
+    close($d);
+    `rm $patch_file`;
+}
+sub find_file {
+    my ($file) = @_;
+
+    if ($file =~ /.*(\.\.\/)/p) {
+	$file = ${^POSTMATCH};
+    }
+
+    my $n = (split('/',$file))[-1];
+    chomp (my @matches = `find $source_path -iname $n`);
+
+    foreach (@matches) {
+        if ($_ =~ $n) {
+            $file = $_;
+        }
+    }
+    return $file;
+}
+
+open(BUILD_LOG, '<', "$log_file") or die $!;
+while (<BUILD_LOG>) {
+    if($_ =~ /(\S+):([0-9]*):([0-9]*): note: (basic block|loop) (vectorized)/) {
+	$fmv->{s_name} = (split('/',$1))[-1];
+	$fmv->{f_name} = $1;
+	push @{$f{$1}->{v_line}},$2;
+    }
+}
+close(BUILD_LOG);
+
+foreach (keys %f) {
+    # print "$_ => @{$f{$_}->{v_line}}\n";
+    my $fname = $_;
+    my @flines = @{$f{$_}->{v_line}};
+
+    if ($fname =~ /(\.c$)/) {
+        my $f_path = &find_file($fname);
+
+        my @keys = 0;
+        my $i = 0;
+        foreach (`ctags --c-kinds=f -x $f_path`) {
+            chomp $_;
+            $keys[$i++] = (split(/\s+/,$_))[2]; # get function number line
+        }
+        @keys = sort {$a <=> $b} @keys;
+
+        my @match_line = 0;
+        # foreach line vectorized look for its closest function
+        foreach my $i ( 0 .. $#flines ) {
+            foreach (@keys) {
+            if ($_ < $flines[$i] ) {
+                $match_line[$i] = $_;
+            }
+            }
+        }
+
+        my %h;
+        foreach (@match_line) {$h{$_} = $_;} @match_line = keys %h;
+        @match_line = sort {$a <=> $b} @match_line;
+
+        &patch_function($f_path,@match_line);
+    }
+}