Merge branch 'exec/shift-optimizations' into 'master'

Test arithmetic optimization for multiply / divide by power of two

See merge request !58

exec/ShiftOptimization.java

+class Main {
+    public int length;
+    public int[] values;
+
+    public Main init() {
+        length = 6;
+        values = new int[length];
+        values[0] = 1;
+        values[1] = 2147483647;  /* 2^31-1    = 0111..111 */
+        values[2] = 1073741825;  /* 2^30+1    = 0100..001 */
+        values[3] = -1;          /*             1111..111 */
+        values[4] = -2147483648; /* -2^31     = 1000..000 */
+        values[5] = -2147483647; /* -2^31 + 1 = 1000..001 */
+        return this;
+    }
+
+    public void run() {
+        int step = 0;
+        while (step < length) {
+            int i = values[step];
+
+            System.out.println(i * 0);
+
+            System.out.println(i * 1);          /* 2^0 */
+            System.out.println(i * 2);          /* 2^1 */
+            System.out.println(i * 4);          /* 2^2 */
+            System.out.println(i * 536870912);  /* 2^29 */
+            System.out.println(i * 1073741824); /* 2^30 */
+
+            System.out.println(i * -1);          /* -2^0 */
+            System.out.println(i * -2);          /* -2^1 */
+            System.out.println(i * -4);          /* -2^2 */
+            System.out.println(i * -536870912);  /* -2^29 */
+            System.out.println(i * -1073741824); /* -2^30 */
+            System.out.println(i * -2147483648); /* -2^31 */
+
+            System.out.write(10);
+
+            System.out.println(i / 1);          /* 2^0 */
+            System.out.println(i / 2);          /* 2^1 */
+            System.out.println(i / 4);          /* 2^2 */
+            System.out.println(i / 536870912);  /* 2^29 */
+            System.out.println(i / 1073741824); /* 2^30 */
+
+            System.out.println(i / -1);          /* -2^0 */
+            System.out.println(i / -2);          /* -2^1 */
+            System.out.println(i / -4);          /* -2^2 */
+            System.out.println(i / -536870912);  /* -2^29 */
+            System.out.println(i / -1073741824); /* -2^30 */
+            System.out.println(i / -2147483648); /* -2^31 */
+
+            System.out.write(10);
+            System.out.write(10);
+
+            step = step + 1;
+        }
+    }
+
+    public static void main(String[] args) {
+        new Main().init().run();
+    }
+}

exec/ShiftOptimization.java.out

+0
+1
+2
+4
+536870912
+1073741824
+-1
+-2
+-4
+-536870912
+-1073741824
+-2147483648
+
+1
+0
+0
+0
+0
+-1
+0
+0
+0
+0
+0
+
+
+0
+2147483647
+-2
+-4
+-536870912
+-1073741824
+-2147483647
+2
+4
+536870912
+1073741824
+-2147483648
+
+2147483647
+1073741823
+536870911
+3
+1
+-2147483647
+-1073741823
+-536870911
+-3
+-1
+0
+
+
+0
+1073741825
+-2147483646
+4
+536870912
+1073741824
+-1073741825
+2147483646
+-4
+-536870912
+-1073741824
+-2147483648
+
+1073741825
+536870912
+268435456
+2
+1
+-1073741825
+-536870912
+-268435456
+-2
+-1
+0
+
+
+0
+-1
+-2
+-4
+-536870912
+-1073741824
+1
+2
+4
+536870912
+1073741824
+-2147483648
+
+-1
+0
+0
+0
+0
+1
+0
+0
+0
+0
+0
+
+
+0
+-2147483648
+0
+0
+0
+0
+-2147483648
+0
+0
+0
+0
+0
+
+-2147483648
+-1073741824
+-536870912
+-4
+-2
+-2147483648
+1073741824
+536870912
+4
+2
+1
+
+
+0
+-2147483647
+2
+4
+536870912
+1073741824
+2147483647
+-2
+-4
+-536870912
+-1073741824
+-2147483648
+
+-2147483647
+-1073741823
+-536870911
+-3
+-1
+2147483647
+1073741823
+536870911
+3
+1
+0