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/**
* @test
* @bug 8073670
* @summary Test that causes C2 to fold two NaNs with different values into a single NaN.
*
* @run main/othervm -XX:-TieredCompilation -Xcomp
* -XX:CompileCommand=compileonly,compiler.c2.FloatingPointFoldingTest::test_double_inf
* -XX:CompileCommand=compileonly,compiler.c2.FloatingPointFoldingTest::test_double_zero
* -XX:CompileCommand=compileonly,compiler.c2.FloatingPointFoldingTest::test_double_nan
* -XX:CompileCommand=compileonly,compiler.c2.FloatingPointFoldingTest::test_float_inf
* -XX:CompileCommand=compileonly,compiler.c2.FloatingPointFoldingTest::test_float_zero
* -XX:CompileCommand=compileonly,compiler.c2.FloatingPointFoldingTest::test_float_nan
* compiler.c2.FloatingPointFoldingTest
*/
package compiler.c2;
public class FloatingPointFoldingTest {
// Double values.
public static final long MINUS_INF_LONGBITS = 0xfff0000000000000L;
public static final double DOUBLE_MINUS_INF = Double.longBitsToDouble(MINUS_INF_LONGBITS);
public static final long PLUS_INF_LONGBITS = 0x7ff0000000000000L;
public static final double DOUBLE_PLUS_INF = Double.longBitsToDouble(PLUS_INF_LONGBITS);
public static final long MINUS_ZERO_LONGBITS = 0x8000000000000000L;
public static final double DOUBLE_MINUS_ZERO = Double.longBitsToDouble(MINUS_ZERO_LONGBITS);
// We need two different NaN values. A floating point number is
// considered to be NaN is the sign bit is 0, all exponent bits
// are set to 1, and at least one bit of the exponent is not zero.
//
// As java.lang.Double.NaN is 0x7ff8000000000000L, we use
// 0x7ffc000000000000L as a second NaN double value.
public static final long NAN_LONGBITS = 0x7ffc000000000000L;
public static final double DOUBLE_NAN = Double.longBitsToDouble(NAN_LONGBITS);
// Float values.
public static final int MINUS_INF_INTBITS = 0xff800000;
public static final float FLOAT_MINUS_INF = Float.intBitsToFloat(MINUS_INF_INTBITS);
public static final int PLUS_INF_INTBITS = 0x7f800000;
public static final float FLOAT_PLUS_INF = Float.intBitsToFloat(PLUS_INF_INTBITS);
public static final int MINUS_ZERO_INTBITS = 0x80000000;
public static final float FLOAT_MINUS_ZERO = Float.intBitsToFloat(MINUS_ZERO_INTBITS);
// As java.lang.Float.NaN is 0x7fc00000, we use 0x7fe00000
// as a second NaN float value.
public static final int NAN_INTBITS = 0x7fe00000;
public static final float FLOAT_NAN = Float.intBitsToFloat(NAN_INTBITS);
// Double tests.
static void test_double_inf(long[] result) {
double d1 = DOUBLE_MINUS_INF;
double d2 = DOUBLE_PLUS_INF;
result[0] = Double.doubleToRawLongBits(d1);
result[1] = Double.doubleToRawLongBits(d2);
}
static void test_double_zero(long[] result) {
double d1 = DOUBLE_MINUS_ZERO;
double d2 = 0;
result[0] = Double.doubleToRawLongBits(d1);
result[1] = Double.doubleToRawLongBits(d2);
}
static void test_double_nan(long[] result) {
double d1 = DOUBLE_NAN;
double d2 = Double.NaN;
result[0] = Double.doubleToRawLongBits(d1);
result[1] = Double.doubleToRawLongBits(d2);
}
// Float tests.
static void test_float_inf(int[] result) {
float f1 = FLOAT_MINUS_INF;
float f2 = FLOAT_PLUS_INF;
result[0] = Float.floatToRawIntBits(f1);
result[1] = Float.floatToRawIntBits(f2);
}
static void test_float_zero(int[] result) {
float f1 = FLOAT_MINUS_ZERO;
float f2 = 0;
result[0] = Float.floatToRawIntBits(f1);
result[1] = Float.floatToRawIntBits(f2);
}
static void test_float_nan(int[] result) {
float f1 = FLOAT_NAN;
float f2 = Float.NaN;
result[0] = Float.floatToRawIntBits(f1);
result[1] = Float.floatToRawIntBits(f2);
}
// Check doubles.
static void check_double(long[] result, double d1, double d2) {
if (result[0] == result[1]) {
throw new RuntimeException("ERROR: Two different double values are considered equal. \n"
+ String.format("\toriginal values: 0x%x 0x%x\n", Double.doubleToRawLongBits(d1), Double.doubleToRawLongBits(d2))
+ String.format("\tvalues after execution of method test(): 0x%x 0x%x", result[0], result[1]));
}
}
// Check floats.
static void check_float(int[] result, float f1, float f2) {
if (result[0] == result[1]) {
throw new RuntimeException("ERROR: Two different float values are considered equal. \n"
+ String.format("\toriginal values: 0x%x 0x%x\n", Float.floatToRawIntBits(f1), Float.floatToRawIntBits(f2))
+ String.format("\tvalues after execution of method test(): 0x%x 0x%x", result[0], result[1]));
}
}
public static void main(String[] args) {
// Float tests.
int[] iresult = new int[2];
// -Inf and +Inf.
test_float_inf(iresult);
check_float(iresult, FLOAT_MINUS_INF, FLOAT_PLUS_INF);
// 0 and -0.
test_float_zero(iresult);
check_float(iresult, FLOAT_MINUS_ZERO, 0);
// Diferrent NaNs.
test_float_nan(iresult);
check_float(iresult, FLOAT_NAN, Float.NaN);
// Double tests.
long[] lresult = new long[2];
// -Inf and +Inf.
test_double_inf(lresult);
check_double(lresult, DOUBLE_MINUS_INF, DOUBLE_PLUS_INF);
// 0 and -0.
test_double_zero(lresult);
check_double(lresult, DOUBLE_MINUS_ZERO, 0);
// Diferrent NaNs.
test_double_nan(lresult);
check_double(lresult, DOUBLE_NAN, Double.NaN);
}
}