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Completes java.lang.Integer emulation

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This commit is contained in:
konsoletyper 2014-03-08 14:38:32 +04:00
parent ca6e325b74
commit 136edd4e44
2 changed files with 158 additions and 0 deletions
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102
teavm-classlib/src/main/java/org/teavm/classlib/java/lang/TInteger.java
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@ -251,4 +251,106 @@ public class TInteger extends TNumber implements TComparable<TInteger> {
public static int compare(int x, int y) {
return x > y ? 1 : x < y ? -1 : 0;
}
public static int numberOfLeadingZeros(int i) {
if (i == 0) {
return SIZE;
}
int n = 0;
if (i >>> 16 != 0) {
i >>>= 16;
n |= 16;
}
if (i >>> 8 != 0) {
i >>>= 8;
n |= 8;
}
if (i >>> 4 != 0) {
i >>>= 4;
n |= 4;
}
if (i >>> 2 != 0) {
i >>>= 2;
n |= 2;
}
if (i >>> 1 != 0) {
i >>>= 1;
n |= 1;
}
return SIZE - n - 1;
}
public static int numberOfTrailingZeros(int i) {
if (i == 0) {
return SIZE;
}
int n = 0;
if (i << 16 != 0) {
i <<= 16;
n |= 16;
}
if (i << 8 != 0) {
i <<= 8;
n |= 8;
}
if (i << 4 != 0) {
i <<= 4;
n |= 4;
}
if (i << 2 != 0) {
i <<= 2;
n |= 2;
}
if (i << 1 != 0) {
i <<= 1;
n |= 1;
}
return SIZE - n - 1;
}
public static int highestOneBit(int i) {
return 0x80000000 >>> numberOfLeadingZeros(i);
}
public static int lowestOneBit(int i) {
return 1 << numberOfTrailingZeros(i);
}
public static int bitCount(int i) {
i = (i & 0xAAAAAAAA) >> 1 + i & 0x55555555;
i = (i & 0xCCCCCCCC) >> 2 + i & 0x33333333;
i = (i & 0x30303030) >> 4 + i & 0x03030303;
i = (i & 0x07000700) >> 8 + i & 0x00070007;
i = (i & 0x000F0000) >> 16 + i & 0x0000000F;
return i;
}
public static int rotateLeft(int i, int distance) {
distance &= 0x1F;
return (i << distance) | (i >>> (32 - distance));
}
public static int rotateRight(int i, int distance) {
distance &= 0x1F;
return (i >>> distance) | (i << (32 - distance));
}
public static int reverse(int i) {
i = (i & 0xAAAAAAAA) >> 1 + (i & 0x55555555) << 1;
i = (i & 0xCCCCCCCC) >> 2 + (i & 0x33333333) << 2;
i = (i & 0xF0F0F0F0) >> 4 + (i & 0x0F0F0F0F) << 4;
i = (i & 0xFF00FF00) >> 8 + (i & 0x00FF00FF) << 8;
i = (i & 0xFFFF0000) >> 16 + (i & 0x0000FFFF) << 16;
return i;
}
public static int reverseBytes(int i) {
i = (i & 0xFF00FF00) >> 8 + (i & 0x00FF00FF) << 8;
i = i >> 16 + i << 16;
return i;
}
public static int signum(int i) {
return (i >> 31) | (-i >>> 31);
}
}

56
teavm-classlib/src/test/java/org/teavm/classlib/java/lang/IntegerTest.java
View File

@ -67,4 +67,60 @@ public class IntegerTest {
assertEquals(Integer.valueOf(-255), Integer.decode("-0xFF"));
assertEquals(Integer.valueOf(2748), Integer.decode("+#ABC"));
}
@Test
public void numberOfLeadingZerosComputed() {
assertEquals(1, Integer.numberOfLeadingZeros(0x40000000));
assertEquals(1, Integer.numberOfLeadingZeros(0x40000123));
assertEquals(1, Integer.numberOfLeadingZeros(0x7FFFFFFF));
assertEquals(31, Integer.numberOfLeadingZeros(1));
assertEquals(30, Integer.numberOfLeadingZeros(2));
assertEquals(30, Integer.numberOfLeadingZeros(3));
assertEquals(0, Integer.numberOfLeadingZeros(0x80000000));
assertEquals(0, Integer.numberOfLeadingZeros(0x80000123));
assertEquals(0, Integer.numberOfLeadingZeros(0xFFFFFFFF));
assertEquals(32, Integer.numberOfLeadingZeros(0));
}
@Test
public void numberOfTrailingZerosComputed() {
assertEquals(1, Integer.numberOfTrailingZeros(0xFFFFFFFE));
assertEquals(1, Integer.numberOfTrailingZeros(0x40000002));
assertEquals(1, Integer.numberOfTrailingZeros(0x00000002));
assertEquals(31, Integer.numberOfTrailingZeros(0x80000000));
assertEquals(30, Integer.numberOfTrailingZeros(0x40000000));
assertEquals(30, Integer.numberOfTrailingZeros(0xC0000000));
assertEquals(0, Integer.numberOfTrailingZeros(0x00000001));
assertEquals(0, Integer.numberOfTrailingZeros(0x12300003));
assertEquals(0, Integer.numberOfTrailingZeros(0xFFFFFFFF));
assertEquals(32, Integer.numberOfTrailingZeros(0));
}
@Test
public void bitsCounted() {
assertEquals(0, Integer.bitCount(0));
assertEquals(1, Integer.bitCount(1));
assertEquals(1, Integer.bitCount(0x400));
assertEquals(1, Integer.bitCount(0x80000000));
assertEquals(8, Integer.bitCount(0x11111111));
assertEquals(8, Integer.bitCount(0x30303030));
assertEquals(8, Integer.bitCount(0xFF000000));
assertEquals(8, Integer.bitCount(0x000000FF));
assertEquals(32, Integer.bitCount(0xFFFFFFFF));
assertEquals(13, Integer.bitCount(0x5DC6F));
}
@Test
public void bitsReversed() {
assertEquals(0, Integer.reverse(0));
assertEquals(0x80000000, Integer.reverse(1));
assertEquals(0x00200000, Integer.reverse(0x400));
assertEquals(0x00000001, Integer.reverse(0x80000000));
assertEquals(0x88888888, Integer.reverse(0x11111111));
assertEquals(0x0C0C0C0C, Integer.reverse(0x30303030));
assertEquals(0x000000FF, Integer.reverse(0xFF000000));
assertEquals(0xFF000000, Integer.reverse(0x000000FF));
assertEquals(0xFFFFFFFF, Integer.reverse(0xFFFFFFFF));
assertEquals(0xF63BA000, Integer.reverse(0x5DC6F));
}
}