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authorCliff Click <cliffc@acm.org>2023-10-27 20:35:04 +0100
committerCliff Click <cliffc@acm.org>2026-10-08 16:52:27 -0700
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Chapter 5: If Statement, Phi, and Region
Co-authored-by: Dibyendu Majumdar <mobile@majumdar.org.uk> Co-authored-by: XmiliaH <45106915+XmiliaH@users.noreply.github.com> Co-authored-by: Yichen Yan <oraluben@outlook.com> Co-authored-by: Thalia Archibald <thalia@archibald.dev> Co-authored-by: Hsiang-Ying Fu <66062782+fuhsnn@users.noreply.github.com> Co-authored-by: Tamas Hadhazy <helsgithub15@gmail.com> Co-authored-by: Symious <14933944+symious@users.noreply.github.com> Co-authored-by: Claude Opus 5 <noreply@anthropic.com> Co-authored-by: tannal <tannal2409@gmail.com> Co-authored-by: hadha <helsgithub15@gmail.com> Co-authored-by: fuhsnn <66062782+fuhsnn@users.noreply.github.com> Co-authored-by: Tamás Hadházy <85063808+Hels15@users.noreply.github.com> Co-authored-by: RobertObkircher <robert.obkircher@gmail.com> Co-authored-by: Jun Kawasaki <jun784@gmail.com> Co-authored-by: David Rubin <87927264+Rexicon226@users.noreply.github.com>
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+digraph chapter05 {
+/*
+int a = 1;
+if (arg == 1)
+ a = arg+2;
+else {
+ a = arg-3;
+
+}
+
+return a;
+
+*/
+ 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">$ctrl</TD><TD PORT="p1">arg</TD></TR>
+ </TABLE>
+ </TD></TR>
+ </TABLE>>
+ ];
+ Con_7 [ label="#1" ];
+ EQNode8 [ label="==" ];
+ If9 [ shape=plaintext label=<
+ <TABLE BORDER="0" CELLBORDER="1" CELLSPACING="0" CELLPADDING="4">
+ <TR><TD BGCOLOR="yellow">If</TD></TR>
+ <TR><TD>
+ <TABLE BORDER="0" CELLBORDER="1" CELLSPACING="0">
+ <TR><TD PORT="p0" BGCOLOR="yellow">True</TD><TD PORT="p1" BGCOLOR="yellow">False</TD></TR>
+ </TABLE>
+ </TD></TR>
+ </TABLE>>
+ ];
+ Con_13 [ label="#2" ];
+ Add14 [ label="+" ];
+ Con_15 [ label="#3" ];
+ Sub16 [ label="-" ];
+ }
+ node [shape=plaintext];
+ subgraph cluster_Scope1_0 {
+ Scope1_0 [label=<
+ <TABLE BORDER="0" CELLBORDER="1" CELLSPACING="0">
+ <TR><TD BGCOLOR="cyan">0</TD><TD PORT="Scope1_0_$ctrl">$ctrl</TD><TD PORT="Scope1_0_arg">arg</TD></TR>
+ </TABLE>>];
+ subgraph cluster_Scope1_1 {
+ Scope1_1 [label=<
+ <TABLE BORDER="0" CELLBORDER="1" CELLSPACING="0">
+ <TR><TD BGCOLOR="cyan">1</TD><TD PORT="Scope1_1_a">a</TD></TR>
+ </TABLE>>];
+ }
+ }
+ node [shape=plaintext];
+ subgraph cluster_Scope12_0 {
+ Scope12_0 [label=<
+ <TABLE BORDER="0" CELLBORDER="1" CELLSPACING="0">
+ <TR><TD BGCOLOR="cyan">0</TD><TD PORT="Scope12_0_$ctrl">$ctrl</TD><TD PORT="Scope12_0_arg">arg</TD></TR>
+ </TABLE>>];
+ subgraph cluster_Scope12_1 {
+ Scope12_1 [label=<
+ <TABLE BORDER="0" CELLBORDER="1" CELLSPACING="0">
+ <TR><TD BGCOLOR="cyan">1</TD><TD PORT="Scope12_1_a">a</TD></TR>
+ </TABLE>>];
+ }
+ }
+ edge [ fontname=Helvetica, fontsize=8 ];
+ EQNode8 -> Start2:p1[taillabel=1];
+ EQNode8 -> Con_7[taillabel=2];
+ If9 -> Start2:p0[taillabel=0; color=red];
+ If9 -> EQNode8[taillabel=1];
+ Add14 -> Start2:p1[taillabel=1];
+ Add14 -> Con_13[taillabel=2];
+ Sub16 -> Start2:p1[taillabel=1];
+ Sub16 -> Con_15[taillabel=2];
+ edge [style=dashed color=cornflowerblue];
+ Scope1_0:"Scope1_0_$ctrl" -> If9:p0;
+ Scope1_0:"Scope1_0_arg" -> Start2:p1;
+ Scope1_1:"Scope1_1_a" -> Add14;
+ edge [style=dashed color=cornflowerblue];
+ Scope12_0:"Scope12_0_$ctrl" -> If9:p1;
+ Scope12_0:"Scope12_0_arg" -> Start2:p1;
+ Scope12_1:"Scope12_1_a" -> Sub16;
+}