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[libc] Raise denormal exception if the libc defines __FE_DENORM. 

Reviewed By: michaelrj

Differential Revision: https://reviews.llvm.org/D106604
This commit is contained in:
Siva Chandra Reddy 2021-07-22 22:05:34 +00:00
parent d12ee28e2e
commit c698be47ff
1 changed files with 18 additions and 30 deletions
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48
libc/utils/FPUtil/x86_64/FEnvImpl.h
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@ -251,41 +251,29 @@ static inline int raiseExcept(int excepts) {
// ensure that the writes by the exception handler are maintained
// when raising the next exception.
if (statusValue & internal::ExceptionFlags::Invalid) {
auto raiseHelper = [](uint16_t singleExceptFlag) {
internal::X87StateDescriptor state;
internal::getX87StateDescriptor(state);
state.StatusWord |= internal::ExceptionFlags::Invalid;
internal::writeX87StateDescriptor(state);
internal::fwait();
}
if (statusValue & internal::ExceptionFlags::DivByZero) {
internal::X87StateDescriptor state;
internal::getX87StateDescriptor(state);
state.StatusWord |= internal::ExceptionFlags::DivByZero;
internal::writeX87StateDescriptor(state);
internal::fwait();
}
if (statusValue & internal::ExceptionFlags::Overflow) {
internal::X87StateDescriptor state;
internal::getX87StateDescriptor(state);
state.StatusWord |= internal::ExceptionFlags::Overflow;
internal::writeX87StateDescriptor(state);
internal::fwait();
}
if (statusValue & internal::ExceptionFlags::Underflow) {
internal::X87StateDescriptor state;
internal::getX87StateDescriptor(state);
state.StatusWord |= internal::ExceptionFlags::Underflow;
internal::writeX87StateDescriptor(state);
internal::fwait();
}
if (statusValue & internal::ExceptionFlags::Inexact) {
internal::X87StateDescriptor state;
internal::getX87StateDescriptor(state);
state.StatusWord |= internal::ExceptionFlags::Inexact;
state.StatusWord |= singleExceptFlag;
internal::writeX87StateDescriptor(state);
internal::fwait();
};
if (statusValue & internal::ExceptionFlags::Invalid)
raiseHelper(internal::ExceptionFlags::Invalid);
if (statusValue & internal::ExceptionFlags::DivByZero)
raiseHelper(internal::ExceptionFlags::DivByZero);
if (statusValue & internal::ExceptionFlags::Overflow)
raiseHelper(internal::ExceptionFlags::Overflow);
if (statusValue & internal::ExceptionFlags::Underflow)
raiseHelper(internal::ExceptionFlags::Underflow);
if (statusValue & internal::ExceptionFlags::Inexact)
raiseHelper(internal::ExceptionFlags::Inexact);
#ifdef __FE_DENORM
if (statusValue & internal::ExceptionFlags::Denormal) {
raiseHelper(internal::ExceptionFlags::Denormal);
}
#endif // __FE_DENORM
// There is no special synchronization scheme available to
// raise SEE exceptions. So, we will ignore that for now.