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49 lines
1.6 KiB
JavaScript
49 lines
1.6 KiB
JavaScript
// Copyright (C) 2016 The V8 Project authors. All rights reserved.
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// This code is governed by the BSD license found in the LICENSE file.
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/*---
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es6id: 20.2.2.11
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esid: sec-math.clz32
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description: >
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Catches the int32bit value in the ToUint32 operation
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info: |
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Math.clz32 ( x )
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1. Let n be ToUint32(x).
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2. Let p be the number of leading zero bits in the 32-bit binary representation of n.
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3. Return p.
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7.1.6 ToUint32 ( argument )
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[...]
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3. Let int be the mathematical value that is the same sign as number and whose
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magnitude is floor(abs(number)).
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4. Let int32bit be int modulo 232.
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5. Return int32bit.
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[...]
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---*/
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assert.sameValue(Math.clz32(4294967295), 0, "2**32-1");
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assert.sameValue(Math.clz32(4294967296), 32, "2**32");
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assert.sameValue(Math.clz32(4294967297), 31, "2**32+1");
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assert.sameValue(Math.clz32(65535), 16, "2**16-1");
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assert.sameValue(Math.clz32(65536), 15, "2**16");
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assert.sameValue(Math.clz32(65537), 15, "2**16+1");
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assert.sameValue(Math.clz32(255), 24, "2**8-1");
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assert.sameValue(Math.clz32(256), 23, "2**8");
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assert.sameValue(Math.clz32(257), 23, "2**8+1");
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assert.sameValue(Math.clz32(-4294967295), 31, "-(2**32-1)");
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assert.sameValue(Math.clz32(-4294967296), 32, "-(2**32)");
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assert.sameValue(Math.clz32(-4294967297), 0, "-(2**32+1)");
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assert.sameValue(Math.clz32(-65535), 0, "-(2**16-1)");
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assert.sameValue(Math.clz32(-65536), 0, "-(2**16)");
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assert.sameValue(Math.clz32(-65537), 0, "-(2**16+1)");
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assert.sameValue(Math.clz32(-255), 0, "-(2**8-1)");
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assert.sameValue(Math.clz32(-256), 0, "-(2**8)");
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assert.sameValue(Math.clz32(-257), 0, "-(2**8+1)");
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