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jddarcyjddarcy
committedApr 25, 2023
8304423: Refactor FdLibm.java
Reviewed-by: bpb
1 parent 28829f3 commit d819deb

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‎src/java.base/share/classes/java/lang/FdLibm.java

+82-75
Original file line numberDiff line numberDiff line change
@@ -64,6 +64,16 @@ class FdLibm {
6464
private static final double TWO54 = 0x1.0p54; // 1.80143985094819840000e+16
6565
private static final double HUGE = 1.0e+300;
6666

67+
/*
68+
* Constants for bit-wise manipulation of IEEE 754 double
69+
* values. These constants are for the high-order 32-bits of a
70+
* 64-bit double value: 1 sign bit as the most significant bit,
71+
* followed by 11 exponent bits, and then the remaining bits as
72+
* the significand.
73+
*/
74+
private static final int SIGN_BIT = 0x8000_0000;
75+
private static final int EXP_BITS = 0x7ff0_0000;
76+
private static final int EXP_SIGNIF_BITS = 0x7fff_ffff;
6777

6878
private FdLibm() {
6979
throw new UnsupportedOperationException("No FdLibm instances for you.");
@@ -156,10 +166,10 @@ static double compute(double x) {
156166
ix = __HI(x);
157167

158168
// |x| ~< pi/4
159-
ix &= 0x7fff_ffff;
169+
ix &= EXP_SIGNIF_BITS;
160170
if (ix <= 0x3fe9_21fb) {
161171
return __kernel_sin(x, z, 0);
162-
} else if (ix>=0x7ff0_0000) { // sin(Inf or NaN) is NaN
172+
} else if (ix >= EXP_BITS) { // sin(Inf or NaN) is NaN
163173
return x - x;
164174
} else { // argument reduction needed
165175
n = RemPio2.__ieee754_rem_pio2(x, y);
@@ -211,7 +221,7 @@ static double compute(double x) {
211221
static double __kernel_sin(double x, double y, int iy) {
212222
double z, r, v;
213223
int ix;
214-
ix = __HI(x) & 0x7fff_ffff; // high word of x
224+
ix = __HI(x) & EXP_SIGNIF_BITS; // high word of x
215225
if (ix < 0x3e40_0000) { // |x| < 2**-27
216226
if ((int)x == 0) // generate inexact
217227
return x;
@@ -269,11 +279,11 @@ static double compute(double x) {
269279
ix = __HI(x);
270280

271281
// |x| ~< pi/4
272-
ix &= 0x7fff_ffff;
282+
ix &= EXP_SIGNIF_BITS;
273283
if (ix <= 0x3fe9_21fb) {
274284
return __kernel_cos(x, z);
275-
} else if (ix >= 0x7ff0_0000) { // cos(Inf or NaN) is NaN
276-
return x-x;
285+
} else if (ix >= EXP_BITS) { // cos(Inf or NaN) is NaN
286+
return x - x;
277287
} else { // argument reduction needed
278288
n = RemPio2.__ieee754_rem_pio2(x,y);
279289
switch (n & 3) {
@@ -331,7 +341,7 @@ static double compute(double x) {
331341
static double __kernel_cos(double x, double y) {
332342
double a, hz, z, r, qx = 0.0;
333343
int ix;
334-
ix = __HI(x) & 0x7fff_ffff; // ix = |x|'s high word
344+
ix = __HI(x) & EXP_SIGNIF_BITS; // ix = |x|'s high word
335345
if (ix < 0x3e40_0000) { // if x < 2**27
336346
if (((int)x) == 0) { // generate inexact
337347
return 1.0;
@@ -395,11 +405,11 @@ static double compute(double x) {
395405
ix = __HI(x);
396406

397407
// |x| ~< pi/4
398-
ix &= 0x7fff_ffff;
408+
ix &= EXP_SIGNIF_BITS;
399409
if (ix <= 0x3fe9_21fb) {
400410
return __kernel_tan(x, z, 1);
401-
} else if (ix >= 0x7ff0_0000) { // tan(Inf or NaN) is NaN
402-
return x-x; // NaN
411+
} else if (ix >= EXP_BITS) { // tan(Inf or NaN) is NaN
412+
return x - x; // NaN
403413
} else { // argument reduction needed
404414
n = RemPio2.__ieee754_rem_pio2(x, y);
405415
return __kernel_tan(y[0], y[1], 1 - ((n & 1) << 1)); // 1 -- n even; -1 -- n odd
@@ -462,7 +472,7 @@ static double __kernel_tan(double x, double y, int iy) {
462472
double z, r, v, w, s;
463473
int ix, hx;
464474
hx = __HI(x); // high word of x
465-
ix = hx&0x7fff_ffff; // high word of |x|
475+
ix = hx & EXP_SIGNIF_BITS; // high word of |x|
466476
if (ix < 0x3e30_0000) { // x < 2**-28
467477
if ((int)x == 0) { // generate inexact
468478
if (((ix | __LO(x)) | (iy + 1)) == 0) {
@@ -584,7 +594,7 @@ static int __ieee754_rem_pio2(double x, double[] y) {
584594
int e0, i, j, nx, n, ix, hx;
585595

586596
hx = __HI(x); // high word of x
587-
ix = hx & 0x7fff_ffff;
597+
ix = hx & EXP_SIGNIF_BITS;
588598
if (ix <= 0x3fe9_21fb) { // |x| ~<= pi/4 , no need for reduction
589599
y[0] = x;
590600
y[1] = 0;
@@ -655,13 +665,13 @@ static int __ieee754_rem_pio2(double x, double[] y) {
655665
/*
656666
* all other (large) arguments
657667
*/
658-
if (ix >= 0x7ff0_0000) { // x is inf or NaN
668+
if (ix >= EXP_BITS) { // x is inf or NaN
659669
y[0] = y[1] = x - x;
660670
return 0;
661671
}
662-
// set z = scalbn(|x|,ilogb(x)-23)
672+
// set z = scalbn(|x|, ilogb(x)-23)
663673
z = __LO(z, __LO(x));
664-
e0 = (ix >> 20) - 1046; /* e0 = ilogb(z)-23; */
674+
e0 = (ix >> 20) - 1046; // e0 = ilogb(z) - 23;
665675
z = __HI(z, ix - (e0 << 20));
666676
for (i=0; i < 2; i++) {
667677
tx[i] = (double)((int)(z));
@@ -859,7 +869,7 @@ static int __kernel_rem_pio2(double[] x, double[] y, int e0, int nx, int prec, f
859869

860870
// compute n
861871
z = Math.scalb(z, q0); // actual value of z
862-
z -= 8.0*Math.floor(z*0.125); // trim off integer >= 8
872+
z -= 8.0*Math.floor(z*0.125); // trim off integer >= 8
863873
n = (int) z;
864874
z -= (double)n;
865875
ih = 0;
@@ -1071,7 +1081,7 @@ static double compute(double x) {
10711081
double t = 0, w, p, q, c, r, s;
10721082
int hx, ix;
10731083
hx = __HI(x);
1074-
ix = hx & 0x7fff_ffff;
1084+
ix = hx & EXP_SIGNIF_BITS;
10751085
if (ix >= 0x3ff0_0000) { // |x| >= 1
10761086
if(((ix - 0x3ff0_0000) | __LO(x)) == 0) {
10771087
// asin(1) = +-pi/2 with inexact
@@ -1157,7 +1167,7 @@ static double compute(double x) {
11571167
double z, p, q, r, w, s, c, df;
11581168
int hx, ix;
11591169
hx = __HI(x);
1160-
ix = hx & 0x7fff_ffff;
1170+
ix = hx & EXP_SIGNIF_BITS;
11611171
if (ix >= 0x3ff0_0000) { // |x| >= 1
11621172
if (((ix - 0x3ff0_0000) | __LO(x)) == 0) { // |x| == 1
11631173
if (hx > 0) {// acos(1) = 0
@@ -1166,7 +1176,7 @@ static double compute(double x) {
11661176
return Math.PI + 2.0*pio2_lo;
11671177
}
11681178
}
1169-
return (x-x)/(x-x); // acos(|x| > 1) is NaN
1179+
return (x - x)/(x - x); // acos(|x| > 1) is NaN
11701180
}
11711181
if (ix < 0x3fe0_0000) { // |x| < 0.5
11721182
if (ix <= 0x3c60_0000) { // if |x| < 2**-57
@@ -1255,10 +1265,10 @@ static double compute(double x) {
12551265
int ix, hx, id;
12561266

12571267
hx = __HI(x);
1258-
ix = hx & 0x7fff_ffff;
1268+
ix = hx & EXP_SIGNIF_BITS;
12591269
if (ix >= 0x4410_0000) { // if |x| >= 2^66
1260-
if (ix > 0x7ff0_0000 ||
1261-
(ix == 0x7ff0_0000 && (__LO(x) != 0))) {
1270+
if (ix > EXP_BITS ||
1271+
(ix == EXP_BITS && (__LO(x) != 0))) {
12621272
return x+x; // NaN
12631273
}
12641274
if (hx > 0) {
@@ -1352,10 +1362,10 @@ static double compute(double y, double x) {
13521362
/*unsigned*/ int lx, ly;
13531363

13541364
hx = __HI(x);
1355-
ix = hx & 0x7fff_ffff;
1365+
ix = hx & EXP_SIGNIF_BITS;
13561366
lx = __LO(x);
13571367
hy = __HI(y);
1358-
iy = hy&0x7fff_ffff;
1368+
iy = hy & EXP_SIGNIF_BITS;
13591369
ly = __LO(y);
13601370
if (Double.isNaN(x) || Double.isNaN(y))
13611371
return x + y;
@@ -1378,8 +1388,8 @@ static double compute(double y, double x) {
13781388
}
13791389

13801390
// when x is INF
1381-
if (ix == 0x7ff0_0000) {
1382-
if (iy == 0x7ff0_0000) {
1391+
if (ix == EXP_BITS) {
1392+
if (iy == EXP_BITS) {
13831393
switch(m) {
13841394
case 0: return pi_o_4 + tiny; // atan(+INF, +INF)
13851395
case 1: return -pi_o_4 - tiny; // atan(-INF, +INF)
@@ -1396,7 +1406,7 @@ static double compute(double y, double x) {
13961406
}
13971407
}
13981408
// when y is INF
1399-
if (iy == 0x7ff0_0000) {
1409+
if (iy == EXP_BITS) {
14001410
return (hy < 0)? -pi_o_2 - tiny : pi_o_2 + tiny;
14011411
}
14021412

@@ -1494,23 +1504,23 @@ static class Sqrt {
14941504

14951505
static double compute(double x) {
14961506
double z = 0.0;
1497-
int sign = 0x8000_0000;
1507+
int sign = SIGN_BIT;
14981508
/*unsigned*/ int r, t1, s1, ix1, q1;
14991509
int ix0, s0, q, m, t, i;
15001510

15011511
ix0 = __HI(x); // high word of x
15021512
ix1 = __LO(x); // low word of x
15031513

15041514
// take care of Inf and NaN
1505-
if ((ix0 & 0x7ff0_0000) == 0x7ff0_0000) {
1515+
if ((ix0 & EXP_BITS) == EXP_BITS) {
15061516
return x*x + x; // sqrt(NaN)=NaN, sqrt(+inf)=+inf, sqrt(-inf)=sNaN
15071517
}
15081518
// take care of zero
15091519
if (ix0 <= 0) {
15101520
if (((ix0 & (~sign)) | ix1) == 0)
15111521
return x; // sqrt(+-0) = +-0
15121522
else if (ix0 < 0)
1513-
return (x-x)/(x-x); // sqrt(-ve) = sNaN
1523+
return (x - x)/(x - x); // sqrt(-ve) = sNaN
15141524
}
15151525
// normalize x
15161526
m = (ix0 >> 20);
@@ -2136,7 +2146,7 @@ else if (x_abs > 1.0) // (|x| > 1)**+/-inf = inf, 0
21362146
}
21372147

21382148
final int hx = __HI(x);
2139-
int ix = hx & 0x7fffffff;
2149+
int ix = hx & EXP_SIGNIF_BITS;
21402150

21412151
/*
21422152
* When x < 0, determine if y is an odd integer:
@@ -2176,7 +2186,7 @@ else if (y_abs >= 1.0) { // |y| >= 1.0
21762186

21772187
// (x < 0)**(non-int) is NaN
21782188
if ((n | y_is_int) == 0)
2179-
return (x-x)/(x-x);
2189+
return (x - x)/(x - x);
21802190

21812191
s = 1.0; // s (sign of result -ve**odd) = -1 else = 1
21822192
if ( (n | (y_is_int - 1)) == 0)
@@ -2299,7 +2309,7 @@ else if (j < 0xBB67A)
22992309
if (p_l + OVT > z - p_h)
23002310
return s * INFINITY; // Overflow
23012311
}
2302-
} else if ((j & 0x7fffffff) >= 0x4090cc00 ) { // z <= -1075
2312+
} else if ((j & EXP_SIGNIF_BITS) >= 0x4090cc00 ) { // z <= -1075
23032313
if (((j - 0xc090cc00) | i)!=0) // z < -1075
23042314
return s * 0.0; // Underflow
23052315
else {
@@ -2319,12 +2329,12 @@ else if (j < 0xBB67A)
23192329
final double LG2 = 0x1.62e4_2fef_a39efp-1; // 6.93147180559945286227e-01
23202330
final double LG2_H = 0x1.62e43p-1; // 6.93147182464599609375e-01
23212331
final double LG2_L = -0x1.05c6_10ca_86c39p-29; // -1.90465429995776804525e-09
2322-
i = j & 0x7fffffff;
2332+
i = j & EXP_SIGNIF_BITS;
23232333
k = (i >> 20) - 0x3ff;
23242334
n = 0;
23252335
if (i > 0x3fe00000) { // if |z| > 0.5, set n = [z + 0.5]
23262336
n = j + (0x00100000 >> (k + 1));
2327-
k = ((n & 0x7fffffff) >> 20) - 0x3ff; // new k for n
2337+
k = ((n & EXP_SIGNIF_BITS) >> 20) - 0x3ff; // new k for n
23282338
t = 0.0;
23292339
t = __HI(t, (n & ~(0x000fffff >> k)) );
23302340
n = ((n & 0x000fffff) | 0x00100000) >> (20 - k);
@@ -2449,7 +2459,7 @@ public static double compute(double x) {
24492459

24502460
hx = __HI(x); /* high word of x */
24512461
xsb = (hx >> 31) & 1; /* sign bit of x */
2452-
hx &= 0x7fffffff; /* high word of |x| */
2462+
hx &= EXP_SIGNIF_BITS; /* high word of |x| */
24532463

24542464
/* filter out non-finite argument */
24552465
if (hx >= 0x40862E42) { /* if |x| >= 709.78... */
@@ -2568,8 +2578,6 @@ static final class Log {
25682578
Lg6 = 0x1.39a09d078c69fp-3, // 1.531383769920937332e-01
25692579
Lg7 = 0x1.2f112df3e5244p-3; // 1.479819860511658591e-01
25702580

2571-
private static final double zero = 0.0;
2572-
25732581
static double compute(double x) {
25742582
double hfsq, f, s, z, R, w, t1, t2, dk;
25752583
int k, hx, i, j;
@@ -2580,17 +2588,17 @@ static double compute(double x) {
25802588

25812589
k=0;
25822590
if (hx < 0x0010_0000) { // x < 2**-1022
2583-
if (((hx & 0x7fff_ffff) | lx) == 0) { // log(+-0) = -inf
2584-
return -TWO54/zero;
2591+
if (((hx & EXP_SIGNIF_BITS) | lx) == 0) { // log(+-0) = -inf
2592+
return -TWO54/0.0;
25852593
}
25862594
if (hx < 0) { // log(-#) = NaN
2587-
return (x - x)/zero;
2595+
return (x - x)/0.0;
25882596
}
25892597
k -= 54;
25902598
x *= TWO54; // subnormal number, scale up x
25912599
hx = __HI(x); // high word of x
25922600
}
2593-
if (hx >= 0x7ff0_0000) {
2601+
if (hx >= EXP_BITS) {
25942602
return x + x;
25952603
}
25962604
k += (hx >> 20) - 1023;
@@ -2600,9 +2608,9 @@ static double compute(double x) {
26002608
k += (i >> 20);
26012609
f = x - 1.0;
26022610
if ((0x000f_ffff & (2 + hx)) < 3) {// |f| < 2**-20
2603-
if (f == zero) {
2611+
if (f == 0.0) {
26042612
if (k == 0) {
2605-
return zero;
2613+
return 0.0;
26062614
} else {
26072615
dk = (double)k;
26082616
return dk*ln2_hi + dk*ln2_lo;
@@ -2694,7 +2702,7 @@ public static double compute(double x) {
26942702

26952703
k=0;
26962704
if (hx < 0x0010_0000) { /* x < 2**-1022 */
2697-
if (((hx & 0x7fff_ffff) | lx) == 0) {
2705+
if (((hx & EXP_SIGNIF_BITS) | lx) == 0) {
26982706
return -TWO54/0.0; /* log(+-0)=-inf */
26992707
}
27002708
if (hx < 0) {
@@ -2705,12 +2713,12 @@ public static double compute(double x) {
27052713
hx = __HI(x);
27062714
}
27072715

2708-
if (hx >= 0x7ff0_0000) {
2716+
if (hx >= EXP_BITS) {
27092717
return x + x;
27102718
}
27112719

27122720
k += (hx >> 20) - 1023;
2713-
i = (k & 0x8000_0000) >>> 31; // unsigned shift
2721+
i = (k & SIGN_BIT) >>> 31; // unsigned shift
27142722
hx = (hx & 0x000f_ffff) | ((0x3ff - i) << 20);
27152723
y = (double)(k + i);
27162724
x = __HI(x, hx); // replace high word of x with hx
@@ -2800,7 +2808,7 @@ public static double compute(double x) {
28002808
int k, hx, hu=0, ax;
28012809

28022810
hx = __HI(x); /* high word of x */
2803-
ax = hx & 0x7fff_ffff;
2811+
ax = hx & EXP_SIGNIF_BITS;
28042812

28052813
k = 1;
28062814
if (hx < 0x3FDA_827A) { /* x < 0.41422 */
@@ -2826,7 +2834,7 @@ public static double compute(double x) {
28262834
}
28272835
}
28282836

2829-
if (hx >= 0x7ff0_0000) {
2837+
if (hx >= EXP_BITS) {
28302838
return x + x;
28312839
}
28322840

@@ -2977,7 +2985,6 @@ public static double compute(double x) {
29772985
* to produce the hexadecimal values shown.
29782986
*/
29792987
static class Expm1 {
2980-
private static final double one = 1.0;
29812988
private static final double huge = 1.0e+300;
29822989
private static final double tiny = 1.0e-300;
29832990
private static final double o_threshold = 0x1.62e42fefa39efp9; // 7.09782712893383973096e+02
@@ -2997,9 +3004,9 @@ static double compute(double x) {
29973004
/*unsigned*/ int hx;
29983005

29993006
hx = __HI(x); // high word of x
3000-
xsb = hx & 0x8000_0000; // sign bit of x
3007+
xsb = hx & SIGN_BIT; // sign bit of x
30013008
y = Math.abs(x);
3002-
hx &= 0x7fff_ffff; // high word of |x|
3009+
hx &= EXP_SIGNIF_BITS; // high word of |x|
30033010

30043011
// filter out huge and non-finite argument
30053012
if (hx >= 0x4043_687A) { // if |x| >= 56*ln2
@@ -3017,7 +3024,7 @@ static double compute(double x) {
30173024
}
30183025
if (xsb != 0) { // x < -56*ln2, return -1.0 with inexact
30193026
if (x + tiny < 0.0) { // raise inexact
3020-
return tiny - one; // return -1
3027+
return tiny - 1.0; // return -1
30213028
}
30223029
}
30233030
}
@@ -3052,7 +3059,7 @@ static double compute(double x) {
30523059
// x is now in primary range
30533060
hfx = 0.5*x;
30543061
hxs = x*hfx;
3055-
r1 = one + hxs*(Q1 + hxs*(Q2 + hxs*(Q3 + hxs*(Q4 + hxs*Q5))));
3062+
r1 = 1.0 + hxs*(Q1 + hxs*(Q2 + hxs*(Q3 + hxs*(Q4 + hxs*Q5))));
30563063
t = 3.0 - r1*hfx;
30573064
e = hxs *((r1 - t)/(6.0 - x*t));
30583065
if (k == 0) {
@@ -3067,23 +3074,23 @@ static double compute(double x) {
30673074
if (x < -0.25) {
30683075
return -2.0*(e - (x + 0.5));
30693076
} else {
3070-
return one + 2.0*(x - e);
3077+
return 1.0 + 2.0*(x - e);
30713078
}
30723079
}
30733080
if (k <= -2 || k > 56) { // suffice to return exp(x) - 1
3074-
y = one - (e - x);
3081+
y = 1.0 - (e - x);
30753082
y = __HI(y, __HI(y) + (k << 20)); // add k to y's exponent
3076-
return y - one;
3083+
return y - 1.0;
30773084
}
3078-
t = one;
3085+
t = 1.0;
30793086
if (k < 20) {
30803087
t = __HI(t, 0x3ff0_0000 - (0x2_00000 >> k)); // t = 1-2^-k
30813088
y = t - ( e - x);
30823089
y = __HI(y, __HI(y) + (k << 20)); // add k to y's exponent
30833090
} else {
30843091
t = __HI(t, ((0x3ff - k) << 20)); // 2^-k
30853092
y = x - (e + t);
3086-
y += one;
3093+
y += 1.0;
30873094
y = __HI(y, __HI(y) + (k << 20)); // add k to y's exponent
30883095
}
30893096
}
@@ -3120,10 +3127,10 @@ static double compute(double x) {
31203127

31213128
// High word of |x|
31223129
jx = __HI(x);
3123-
ix = jx & 0x7fff_ffff;
3130+
ix = jx & EXP_SIGNIF_BITS;
31243131

31253132
// x is INF or NaN
3126-
if (ix >= 0x7ff0_0000) {
3133+
if (ix >= EXP_BITS) {
31273134
return x + x;
31283135
}
31293136

@@ -3196,10 +3203,10 @@ static double compute(double x) {
31963203

31973204
// High word of |x|
31983205
ix = __HI(x);
3199-
ix &= 0x7fff_ffff;
3206+
ix &= EXP_SIGNIF_BITS;
32003207

32013208
// x is INF or NaN
3202-
if (ix >= 0x7ff0_0000) {
3209+
if (ix >= EXP_BITS) {
32033210
return x*x;
32043211
}
32053212

@@ -3273,10 +3280,10 @@ static double compute(double x) {
32733280

32743281
// High word of |x|.
32753282
jx = __HI(x);
3276-
ix = jx & 0x7fff_ffff;
3283+
ix = jx & EXP_SIGNIF_BITS;
32773284

32783285
// x is INF or NaN
3279-
if (ix >= 0x7ff0_0000) {
3286+
if (ix >= EXP_BITS) {
32803287
if (jx >= 0) { // tanh(+-inf)=+-1
32813288
return 1.0/x + 1.0;
32823289
} else { // tanh(NaN) = NaN
@@ -3314,17 +3321,17 @@ static double compute(double x, double p) {
33143321
lx = __LO(x); // low word of x
33153322
hp = __HI(p); // high word of p
33163323
lp = __LO(p); // low word of p
3317-
sx = hx & 0x8000_0000;
3318-
hp &= 0x7fff_ffff;
3319-
hx &= 0x7fff_ffff;
3324+
sx = hx & SIGN_BIT;
3325+
hp &= EXP_SIGNIF_BITS;
3326+
hx &= EXP_SIGNIF_BITS;
33203327

33213328
// purge off exception values
33223329
if ((hp | lp) == 0) {// p = 0
33233330
return (x*p)/(x*p);
33243331
}
3325-
if ((hx >= 0x7ff0_0000) || // not finite
3326-
((hp >= 0x7ff0_0000) && // p is NaN
3327-
(((hp - 0x7ff0_0000) | lp) != 0)))
3332+
if ((hx >= EXP_BITS) || // not finite
3333+
((hp >= EXP_BITS) && // p is NaN
3334+
(((hp - EXP_BITS) | lp) != 0)))
33283335
return (x*p)/(x*p);
33293336

33303337
if (hp <= 0x7fdf_ffff) { // now x < 2p
@@ -3362,13 +3369,13 @@ private static double __ieee754_fmod(double x, double y) {
33623369
lx = __LO(x); // low word of x
33633370
hy = __HI(y); // high word of y
33643371
ly = __LO(y); // low word of y
3365-
sx = hx & 0x8000_0000; // sign of x
3372+
sx = hx & SIGN_BIT; // sign of x
33663373
hx ^= sx; // |x|
3367-
hy &= 0x7fff_ffff; // |y|
3374+
hy &= EXP_SIGNIF_BITS; // |y|
33683375

33693376
// purge off exception values
3370-
if ((hy | ly) == 0 || (hx >= 0x7ff0_0000)|| // y = 0, or x not finite
3371-
((hy | ((ly | -ly) >>> 31)) > 0x7ff0_0000)) // or y is NaN, unsigned shift
3377+
if ((hy | ly) == 0 || (hx >= EXP_BITS)|| // y = 0, or x not finite
3378+
((hy | ((ly | -ly) >>> 31)) > EXP_BITS)) // or y is NaN, unsigned shift
33723379
return (x*y)/(x*y);
33733380
if (hx <= hy) {
33743381
if ((hx < hy) || (Integer.compareUnsigned(lx, ly) < 0)) { // |x| < |y| return x

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