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...Original Message -------- Subject: Re: [LLVMdev] NaNs and Infinities Date: Mon, 19 Apr 2010 23:41:43 -0700 From: Javier Martinez <javier at jmartinez.org> To: lost <lostfreeman at gmail.com> Hi, If it's an immediate you can cast the SDValue to a ConstantFP and use the isNaN() or isInfinity() member functions (see below). For non immediates you can use bitcasting to convert the float to an integer. If bits 0-22 are 0 and bits 23-30 are 1 it's infinity; if bits 0-22 are not 0 and bits 23-30 are 1 it's NaN. Others can probably give you a answer and if not at least you hav...

...'m not sure I get it. This variable is still needed couple of lines below: bool isHalf = &CFP->getValueAPF().getSemantics()==&APFloat::IEEEhalf; bool isDouble = &CFP->getValueAPF().getSemantics()==&APFloat::IEEEdouble; bool isInf = CFP->getValueAPF().isInfinity(); bool isNaN = CFP->getValueAPF().isNaN(); if (!isHalf && !isInf && !isNaN) { > // Either half, or some form of long double. > // These appear as a magic letter identifying the type, then a > // fixed number of hex digits. Done. Does it look...

...able is still needed couple of lines > below: > > bool isHalf = &CFP- > >getValueAPF().getSemantics()==&APFloat::IEEEhalf; > bool isDouble = > &CFP->getValueAPF().getSemantics()==&APFloat::IEEEdouble; > bool isInf = CFP->getValueAPF().isInfinity(); > bool isNaN = CFP->getValueAPF().isNaN(); > if (!isHalf && !isInf && !isNaN) { > > > // Either half, or some form of long double. > > // These appear as a magic letter identifying the type, then a > > // fixed number of h...

I've got comments on the code change. The test cases look ok, but I haven't fully checked the math on the half-values. I checked with reference to trunk top-of-tree at revision 156617. I have not compiled the code. lib/AsmParser/LLLexer.cpp Adds support to parse format: 0xH<hexdigits> Tha 0xH format should be described in LangRef.html alongside 0xK<hex> and

Hello! How can I test if floating-point value is NaN or positive/negative infinity?

...es > > below: > > > > bool isHalf = &CFP- > > >getValueAPF().getSemantics()==&APFloat::IEEEhalf; > > bool isDouble = > > &CFP->getValueAPF().getSemantics()==&APFloat::IEEEdouble; > > bool isInf = CFP->getValueAPF().isInfinity(); > > bool isNaN = CFP->getValueAPF().isNaN(); > > if (!isHalf && !isInf && !isNaN) { > > > > > // Either half, or some form of long double. > > > // These appear as a magic letter identifying the type, then a > >...