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refactor: use signed integers for math/base/special/log2, as per FreeBSD #2295

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merged 1 commit into from
Jun 2, 2024
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refactor: use signed integers for math/base/special/log2, as per FreeBSD #2295

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19 changes: 11 additions & 8 deletions lib/node_modules/@stdlib/math/base/special/log2/src/main.c
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Original file line number Diff line number Diff line change
Expand Up @@ -53,6 +53,7 @@ double stdlib_base_log2( const double x ) {
double valHi;
uint32_t hx;
uint32_t lx;
int32_t ihx;
double hfsq;
double hi;
int32_t i;
Expand All @@ -69,31 +70,33 @@ double stdlib_base_log2( const double x ) {
}
xc = x;
stdlib_base_float64_to_words( xc, &hx, &lx );
ihx = (int32_t)hx;
k = 0;
if ( hx < HIGH_MIN_NORMAL_EXP ) {
if ( ihx < HIGH_MIN_NORMAL_EXP ) {
// Case: x < 2**-1022
if ( ( ( hx & STDLIB_CONSTANT_FLOAT64_HIGH_WORD_ABS_MASK ) | lx ) == 0 ) {
if ( ( ( ihx & STDLIB_CONSTANT_FLOAT64_HIGH_WORD_ABS_MASK ) | lx ) == 0 ) {
return STDLIB_CONSTANT_FLOAT64_NINF;
}
k -= 54;

// Subnormal number, scale up x:
xc *= TWO54;
stdlib_base_float64_get_high_word( xc, &hx );
ihx = (int32_t)hx;
}
if ( hx >= HIGH_MAX_NORMAL_EXP ) {
if ( ihx >= HIGH_MAX_NORMAL_EXP ) {
return xc + xc;
}
// Case: log(1) = +0
if ( hx == HIGH_BIASED_EXP_0 && lx == 0 ) {
if ( ihx == HIGH_BIASED_EXP_0 && lx == 0 ) {
return 0;
}
k += ( ( hx>>20 ) - STDLIB_CONSTANT_FLOAT64_EXPONENT_BIAS );
hx &= STDLIB_CONSTANT_FLOAT64_HIGH_WORD_SIGNIFICAND_MASK;
i = ( hx+0x95f64 ) & HIGH_MIN_NORMAL_EXP;
k += ( ( ihx>>20 ) - STDLIB_CONSTANT_FLOAT64_EXPONENT_BIAS );
ihx &= STDLIB_CONSTANT_FLOAT64_HIGH_WORD_SIGNIFICAND_MASK;
i = ( ihx+0x95f64 ) & HIGH_MIN_NORMAL_EXP;

// Normalize x or x/2...
stdlib_base_float64_set_high_word( hx|( i^HIGH_BIASED_EXP_0 ), &xc );
stdlib_base_float64_set_high_word( (uint32_t)( ihx|( i^HIGH_BIASED_EXP_0 ) ), &xc );
k += (i>>20);
y = (double)k;
f = xc - 1.0;
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