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8346931: Replace divisions by zero in sharedRuntimeTrans.cpp

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Reviewed-by: kbarrett, mdoerr
This commit is contained in:
Matthias Baesken 2025-03-26 12:31:28 +00:00
parent bc5cde1b19
commit b4dc364575
2 changed files with 15 additions and 21 deletions
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33
src/hotspot/share/runtime/sharedRuntimeTrans.cpp
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@ -112,7 +112,6 @@ ln2_hi = 6.93147180369123816490e-01, /* 3fe62e42 fee00000 */
static double zero = 0.0;
ATTRIBUTE_NO_UBSAN
static double __ieee754_log(double x) {
double hfsq,f,s,z,R,w,t1,t2,dk;
int k,hx,i,j;
@ -126,8 +125,8 @@ static double __ieee754_log(double x) {
k=0;
if (hx < 0x00100000) { /* x < 2**-1022 */
if (((hx&0x7fffffff)|lx)==0)
return -two54/zero; /* log(+-0)=-inf */
if (hx<0) return (x-x)/zero; /* log(-#) = NaN */
return -std::numeric_limits<double>::infinity(); /* log(+-0)=-inf */
if (hx<0) return std::numeric_limits<double>::quiet_NaN(); /* log(-#) = NaN */
k -= 54; x *= two54; /* subnormal number, scale up x */
hx = high(x); /* high word of x */
}
@ -209,7 +208,6 @@ ivln10 = 4.34294481903251816668e-01, /* 0x3FDBCB7B, 0x1526E50E */
log10_2hi = 3.01029995663611771306e-01, /* 0x3FD34413, 0x509F6000 */
log10_2lo = 3.69423907715893078616e-13; /* 0x3D59FEF3, 0x11F12B36 */
ATTRIBUTE_NO_UBSAN
static double __ieee754_log10(double x) {
double y,z;
int i,k,hx;
@ -223,8 +221,8 @@ static double __ieee754_log10(double x) {
k=0;
if (hx < 0x00100000) { /* x < 2**-1022 */
if (((hx&0x7fffffff)|lx)==0)
return -two54/zero; /* log(+-0)=-inf */
if (hx<0) return (x-x)/zero; /* log(-#) = NaN */
return -std::numeric_limits<double>::infinity(); /* log(+-0)=-inf */
if (hx<0) return std::numeric_limits<double>::quiet_NaN(); /* log(-#) = NaN */
k -= 54; x *= two54; /* subnormal number, scale up x */
hx = high(x); /* high word of x */
}
@ -516,14 +514,16 @@ static double __ieee754_pow(double x, double y) {
if(lx==0) {
if(ix==0x7ff00000||ix==0||ix==0x3ff00000){
z = ax; /*x is +-0,+-inf,+-1*/
if(hy<0) z = one/z; /* z = (1/|x|) */
if(hy<0) {
if (ix == 0) {
z = std::numeric_limits<double>::infinity();
} else {
z = one/z; /* z = (1/|x|) */
}
}
if(hx<0) {
if(((ix-0x3ff00000)|yisint)==0) {
#ifdef CAN_USE_NAN_DEFINE
z = NAN;
#else
z = (z-z)/(z-z); /* (-1)**non-int is NaN */
#endif
z = std::numeric_limits<double>::quiet_NaN();
} else if(yisint==1)
z = -1.0*z; /* (x<0)**odd = -(|x|**odd) */
}
@ -534,12 +534,9 @@ static double __ieee754_pow(double x, double y) {
n = (hx>>31)+1;
/* (x<0)**(non-int) is NaN */
if((n|yisint)==0)
#ifdef CAN_USE_NAN_DEFINE
return NAN;
#else
return (x-x)/(x-x);
#endif
if((n|yisint)==0) {
return std::numeric_limits<double>::quiet_NaN();
}
s = one; /* s (sign of result -ve**odd) = -1 else = 1 */
if((n|(yisint-1))==0) s = -one;/* (-ve)**(odd int) */

3
src/hotspot/share/utilities/globalDefinitions_gcc.hpp
View File

@ -81,9 +81,6 @@ inline int g_isnan(double f) { return isnan(f); }
#error "missing platform-specific definition here"
#endif
#define CAN_USE_NAN_DEFINE 1
// Checking for finiteness
inline int g_isfinite(jfloat f) { return isfinite(f); }