Diffusion Ant (master) Code

ant/examples/spec/tco_shift.js
8755416ca476master

tco_shift.js
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			import { test, summary } from './helpers.js';

			console.log('TCO Shift/Comparison Operator Tests\n');

			function identity(x) {
			return x;
			}

			function shiftLeft(n) {
			if (n <= 0) return identity(1) << 3;
			return shiftLeft(n - 1);
			}
			test('f() << N result', shiftLeft(5), 8);

			function shiftRight(n) {
			if (n <= 0) return identity(64) >> 2;
			return shiftRight(n - 1);
			}
			test('f() >> N result', shiftRight(5), 16);

			function shiftRightUnsigned(n) {
			if (n <= 0) return identity(-1) >>> 24;
			return shiftRightUnsigned(n - 1);
			}
			test('f() >>> N result', shiftRightUnsigned(5), 255);

			function lessThan(n) {
			if (n <= 0) return identity(3) < 5;
			return lessThan(n - 1);
			}
			test('f() < N result', lessThan(3), true);

			function greaterThan(n) {
			if (n <= 0) return identity(10) > 5;
			return greaterThan(n - 1);
			}
			test('f() > N result', greaterThan(3), true);

			function lessEq(n) {
			if (n <= 0) return identity(5) <= 5;
			return lessEq(n - 1);
			}
			test('f() <= N result', lessEq(3), true);

			function greaterEq(n) {
			if (n <= 0) return identity(5) >= 10;
			return greaterEq(n - 1);
			}
			test('f() >= N result', greaterEq(3), false);

			function deepShiftLeft(n) {
			if (n <= 0) return identity(1) << 3;
			return deepShiftLeft(n - 1);
			}
			test('deep f()<<N value correct', deepShiftLeft(500), 8);

			function deepShiftRight(n) {
			if (n <= 0) return identity(64) >> 2;
			return deepShiftRight(n - 1);
			}
			test('deep f()>>N value correct', deepShiftRight(500), 16);

			function deepUnsignedShift(n) {
			if (n <= 0) return identity(-1) >>> 24;
			return deepUnsignedShift(n - 1);
			}
			test('deep f()>>>N value correct', deepUnsignedShift(500), 255);

			function recurseShiftArg(n) {
			if (n <= 0) return 'done';
			return recurseShiftArg((n - 1) >> 0);
			}
			test('shift inside arg (tail-eligible)', recurseShiftArg(100000), 'done');

			function ternaryShift(n) {
			return n <= 0 ? identity(1) << 4 : ternaryShift(n - 1);
			}
			test('ternary with shift in then-branch', ternaryShift(5), 16);

			function ternaryBothShift(flag) {
			return flag ? identity(1) << 2 : identity(1) >> 1;
			}
			test('ternary both shift true', ternaryBothShift(true), 4);
			test('ternary both shift false', ternaryBothShift(false), 0);

			summary();

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