From a6d709139ca5cfd647ec23b9f7cfc96aeea3e1eb Mon Sep 17 00:00:00 2001
From: Cliff Click <cliffc@acm.org>
Date: Sat, 11 Nov 2023 23:17:22 +0000
Subject: Chapter 6: Peepholes for If
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Co-authored-by: Dibyendu Majumdar <mobile@majumdar.org.uk>
Co-authored-by: Thalia Archibald <thalia@archibald.dev>
Co-authored-by: Yichen Yan <oraluben@outlook.com>
Co-authored-by: tannal <tannal2409@gmail.com>
Co-authored-by: hadha <helsgithub15@gmail.com>
Co-authored-by: Tamás Hadházy <85063808+Hels15@users.noreply.github.com>
Co-authored-by: Tamas Hadhazy <helsgithub15@gmail.com>
Co-authored-by: RobertObkircher <robert.obkircher@gmail.com>
Co-authored-by: Robert Obkircher <robert.obkircher@gmail.com>
---
 docs/chapter06/06-graph3-nonconst-peephole.gv | 56 +++++++++++++++++++++++++++
 1 file changed, 56 insertions(+)
 create mode 100644 docs/chapter06/06-graph3-nonconst-peephole.gv

(limited to 'docs/chapter06/06-graph3-nonconst-peephole.gv')

diff --git a/docs/chapter06/06-graph3-nonconst-peephole.gv b/docs/chapter06/06-graph3-nonconst-peephole.gv
new file mode 100644
index 00000000..f8e3e5fa
--- /dev/null
+++ b/docs/chapter06/06-graph3-nonconst-peephole.gv
@@ -0,0 +1,56 @@
+digraph chapter06 {
+/*
+int a = 0;
+int b = 1;
+if( arg ) {
+    a = 2;
+    if( arg ) { b = 2; }
+    else b = 3;
+}
+return a+b;
+
+*/
+	rankdir=BT;
+	ordering="in";
+	concentrate="true";
+	subgraph cluster_Nodes {
+		Start2 [ shape=plaintext label=<
+			<TABLE BORDER="0" CELLBORDER="1" CELLSPACING="0" CELLPADDING="4">
+			<TR><TD BGCOLOR="yellow">Start</TD></TR>
+			<TR><TD>
+				<TABLE BORDER="0" CELLBORDER="1" CELLSPACING="0">
+				<TR><TD PORT="p0" BGCOLOR="yellow">$ctrl</TD><TD PORT="p1">arg</TD></TR>
+				</TABLE>
+			</TD></TR>
+			</TABLE>>
+		];
+		Stop3 [ shape=box style=filled fillcolor=yellow label="Stop" ];
+		Region22 [ shape=box style=filled fillcolor=yellow label="Region" ];
+		If8 [ shape=plaintext label=<
+			<TABLE BORDER="0" CELLBORDER="1" CELLSPACING="0" CELLPADDING="4">
+			<TR><TD BGCOLOR="yellow">If</TD></TR>
+			<TR><TD>
+				<TABLE BORDER="0" CELLBORDER="1" CELLSPACING="0">
+				<TR><TD PORT="p0" BGCOLOR="yellow">True</TD><TD PORT="p1" BGCOLOR="yellow">False</TD></TR>
+				</TABLE>
+			</TD></TR>
+			</TABLE>>
+		];
+		Con_27 [ label="#4" ];
+		Con_29 [ label="#1" ];
+		Phi_ab30 [ style=filled fillcolor=lightyellow label="&phi;_ab" ];
+		Return31 [ shape=box style=filled fillcolor=yellow label="Return" ];
+		{ rank=same; Region22;Phi_ab30;}
+	}
+	edge [ fontname=Helvetica, fontsize=8 ];
+	Stop3 -> Return31[taillabel=0 color=red];
+	Region22 -> If8:p0[taillabel=1 color=red];
+	Region22 -> If8:p1[taillabel=2 color=red];
+	If8 -> Start2:p0[taillabel=0 color=red];
+	If8 -> Start2:p1[taillabel=1];
+	Phi_ab30 -> Region22 [style=dotted taillabel=0];
+	Phi_ab30 -> Con_27[taillabel=1];
+	Phi_ab30 -> Con_29[taillabel=2];
+	Return31 -> Region22[taillabel=0 color=red];
+	Return31 -> Phi_ab30[taillabel=1];
+}
-- 
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