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Refactors how we handle NaN and infinity

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The previous approach didn't work properly under MSVC. The wrong
output would be produced for NaN values.

This new approach will directly print out "nan" and "inf" with the
appropriate sign, rather than just wrapping the value in float('').
This commit is contained in:
John Richards 2020-10-15 21:35:19 -04:00
commit ed11ba3fe4
1 changed files with 13 additions and 2 deletions
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15
bytecode.cpp
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@ -272,8 +272,19 @@ void print_const(PycRef<PycObject> obj, PycModule* mod)
{
// Wrap any nan/inf values in float('').
double value = obj.cast<PycCFloat>()->value();
if (std::isnan(value) || std::isinf(value)) {
fprintf(pyc_output, "float('%g')", value);
bool is_negative = std::signbit(value);
if (std::isnan(value)) {
if (is_negative) {
fprintf(pyc_output, "float('-nan')");
} else {
fprintf(pyc_output, "float('nan')");
}
} else if (std::isinf(value)) {
if (is_negative) {
fprintf(pyc_output, "float('-inf')");
} else {
fprintf(pyc_output, "float('inf')");
}
} else {
fprintf(pyc_output, "%g", value);
}