com presentations: Tweak: devs19.html devs19.xml

[email protected] (Rasmus Lerdorf) Mon, 20 May 2019 17:42:00 +0000
Newsgroups php.pres
Message-ID <[email protected]> 
Commit:    288d9619cba09cc133367beb9d47aca143106f93
Author:    Rasmus Lerdorf <[email protected]>         Mon, 20 May 2019 10:42:00 -0700
Parents:   26c79292f51bec5606a20627819cff13b0bc6b60
Branches:  master

Link:       http://git.php.net/?p=presentations.git;a=commitdiff;h=288d9619cba09cc133367beb9d47aca143106f93

Log:
Tweak

Changed paths:
  M  devs19.html
  M  devs19.xml


Diff:
diff --git a/devs19.html b/devs19.html
index 36b0cbe..b805b87 100644
--- a/devs19.html
+++ b/devs19.html
@@ -381,140 +381,6 @@ array_key_exists($needle, $haystack);
 strchr($haystack, $needle);</code></pre>
 		</section>	</section>
 	<section>
-		<section id="dce">
-		<p class="p" style="font-size:2em;text-align:center;">Dead Code Elimination (DCE)</p>
-		<p class="p" style="font-size:1.5em;text-align:center;">Escape Analysis</p>
-		<p class="p" style="font-size:1.4em;text-align:center;">Sparse Conditional Constant Propagation</p>
-		</section>
-<section id="dce0">
-		<pre><code class="result nohighlight" data-trim style="font-size:0.9em;" >php -d opcache.optimization_level=-1 -d opcache.opt_debug_level=0x20000 script</code></pre>
-		<pre><code data-trim style="font-size:1.05em;" >function fn() {
-    $a = 1;
-    return 0;
-}</code></pre>
-		<p class="p" style="font-size:1.1em;text-align:left;">PHP 7.1</p>
-		<pre><code class="result nohighlight" data-trim style="font-size:1em;" >fn: (lines=2, args=0, vars=1, tmps=0)
-L0:   ASSIGN CV0($a) int(1)
-L1:   RETURN int(0)</code></pre>
-		<p class="p" style="font-size:1.1em;text-align:left;">PHP 7.2/7.3</p>
-		<pre><code class="result nohighlight" data-trim style="font-size:1em;" >fn: (lines=1, args=0, vars=0, tmps=0)
-L0:   RETURN int(0)</code></pre>
-		</section>
-<section id="dce1">
-		<pre><code data-trim style="font-size:1.05em;" >function foo(string $s1, string $s2, string $s3, string $s4) {
-    $x = ($s1 . $s2) . ($s3 . $s4);
-    $x = 0;
-    return $x;
-}</code></pre>
-		<pre><code class="result nohighlight" data-trim style="font-size:1em;" >PHP 7.1                                   PHP 7.2/7.3
-foo: (lines=10, args=4, vars=5, tmps=3)   foo: (lines=5, args=4, vars=4, tmps=0)
-L0:   CV0($s1) = RECV 1                   L0:   CV0($s1) = RECV 1
-L1:   CV1($s2) = RECV 2                   L1:   CV1($s2) = RECV 2
-L2:   CV2($s3) = RECV 3                   L2:   CV2($s3) = RECV 3
-L3:   CV3($s4) = RECV 4                   L3:   CV3($s4) = RECV 4
-L4:   T6 = CONCAT CV0($s1) CV1($s2)       L4:   RETURN int(0)
-L5:   T7 = CONCAT CV2($s3) CV3($s4)
-L6:   T5 = CONCAT T6 T7
-L7:   ASSIGN CV4($x) T5
-L8:   ASSIGN CV4($x) int(0)
-L9:   RETURN CV4($x)</code></pre>
-		</section>
-<section id="dce2">
-		<p class="p" style="font-size:1.1em;text-align:left;">Try to trick it</p>
-		<pre><code data-trim style="font-size:1.05em;" >function foo($a) {
-    $b = $a += 3;
-    return $a;
-}</code></pre>
-		<p class="p" style="font-size:1.1em;text-align:left;">PHP 7.2/7.3</p>
-		<pre><code class="result nohighlight" data-trim style="font-size:1em;" >foo: (lines=3, args=1, vars=1, tmps=1)
-L0:   CV0($a) = RECV 1
-L1:   ASSIGN_ADD CV0($a) int(3)
-L2:   RETURN CV0($a)</code></pre>
-		</section>
-<section id="dce3">
-		<p class="p" style="font-size:1.1em;text-align:left;">But...</p>
-		<pre><code data-trim style="font-size:1.05em;" >function foo(int $x, int $y) {
-    $a = [$x];
-    $a[1] = $y;
-    $a = $y;
-    return $a;
-}</code></pre>
-		<pre><code class="result nohighlight" data-trim style="font-size:1em;" >PHP 7.2                                    PHP 7.3
-foo: (lines=7, args=2, vars=3, tmps=1)     foo: (lines=4, args=2, vars=3, tmps=0)
-L0:   CV0($x) = RECV 1                     L0:     CV0($x) = RECV 1
-L1:   CV1($y) = RECV 2                     L1:     CV1($y) = RECV 2
-L2:   CV2($a) = INIT_ARRAY 1 CV0($x) NEXT  L2:     CV2($a) = QM_ASSIGN CV1($y)
-L3:   ASSIGN_DIM CV2($a) int(1)            L3:     RETURN CV2($a)
-L4:   OP_DATA CV1($y)
-L5:   ASSIGN CV2($a) CV1($y)
-L6:   RETURN CV2($a)</code></pre>
-		</section>
-<section id="dce4">
-		<pre><code data-trim style="font-size:1.05em;" >class A { }
-function foo(int $x) {
-    $a = new A;
-    $a-&gt;foo = $x;
-    return $x;
-}</code></pre>
-		<p class="p" style="font-size:1.1em;text-align:left;">PHP 7.3</p>
-		<pre><code class="result nohighlight" data-trim style="font-size:1.05em;" >foo: (lines=2, args=1, vars=1, tmps=0)
-L0:   CV0($x) = RECV 1
-L1:   RETURN CV0($x)</code></pre>
-		</section>
-<section id="dce5">
-		<pre><code data-trim style="font-size:1.05em;" >class A {
-    function __destruct() {}
-}
-function foo(int $x) {
-    $a = new A;
-    $a-&gt;foo = $x;
-    return $x;
-}</code></pre>
-		<p class="p" style="font-size:1.1em;text-align:left;">PHP 7.3</p>
-		<pre><code class="result nohighlight" data-trim style="font-size:1.05em;" >foo: (lines=7, args=1, vars=2, tmps=1)
-L0:   CV0($x) = RECV 1
-L1:   V2 = NEW 0 string(&quot;A&quot;)
-L2:   DO_FCALL
-L3:   CV1($a) = QM_ASSIGN V2
-L4:   ASSIGN_OBJ CV1($a) string(&quot;foo&quot;)
-L5:   OP_DATA CV0($x)
-L6:   RETURN CV0($x)</code></pre>
-		</section>
-<section id="dce6">
-		<pre><code data-trim style="font-size:1.05em;" >function foo(int $x) {
-    if ($x) {
-        $a = [0,1];
-    } else {
-        $a = [0,2];
-    }
-    return $a[0];
-}</code></pre>
-		<p class="p" style="font-size:1.1em;text-align:left;">PHP 7.3</p>
-		<pre><code class="result nohighlight" data-trim style="font-size:1.05em;" >foo: (lines=2, args=1, vars=1, tmps=0)
-L0:   CV0($x) = RECV 1
-L1:   RETURN int(0)</code></pre>
-		</section>
-<section id="dce7">
-		<pre><code data-trim style="font-size:1.05em;" >function foo() {
-    $o = new stdClass();
-    $o-&gt;foo = 0;
-    $i = 1;
-    $c = $i &lt; 2;
-    if ($c) {
-        $k = 2 * $i;
-        $o-&gt;foo = $i;
-        echo $o-&gt;foo;
-    }
-    $o-&gt;foo += 2;
-    $o-&gt;foo++;
-    return $o-&gt;foo;
-}</code></pre>
-		<p class="p" style="font-size:1.1em;text-align:left;">PHP 7.3</p>
-		<pre><code class="result nohighlight" data-trim style="font-size:1.05em;" >foo: (lines=2, args=0, vars=0, tmps=0)
-L0:   ECHO int(1)
-L1:   RETURN int(4)</code></pre>
-		</section>	</section>
-	<section>
 		<section id="wpbench">
 
 <div id="wpbench_container" class="stretch" style="margin: 0 auto"></div>
diff --git a/devs19.xml b/devs19.xml
index 5bc8b91..1533d92 100644
--- a/devs19.xml
+++ b/devs19.xml
@@ -34,7 +34,6 @@
 <slide>slides/intro/eco.xml</slide>
 <slide>slides/intro/wwht2.xml</slide>
 <slide>slides/intro/wwht1.xml</slide>
-<slide>slides/intro/dce2018.xml</slide>
 <slide>slides/intro/wp2018.xml</slide>
 <slide>slides/intro/smemwp2018.xml</slide>
 <slide>slides/intro/supported.xml</slide>