[llvm-commits] [llvm] r51268 - in /llvm/trunk: lib/Transforms/Scalar/InstructionCombining.cpp test/Transforms/InstCombine/sitofp.ll

[Chris Lattner]

On May 19, 2008, at 1:34 PM, Dale Johannesen wrote:

> This is fltSemantics.precision.

Unfortunately, that isn't public and lies about ppc long double :(.   
Moving this to be a helper method on APFloat would make a lot of sense  
though.  I'll take care of it.

-Chris

>
>
> On May 19, 2008, at 1:18 PM, Chris Lattner wrote:
>
>> +/// GetFPMantissaWidth - Return the width of the mantissa (aka
>> significand) of
>> +/// the specified floating point type in bits.  This returns -1 if
>> unknown.
>> +static int GetFPMantissaWidth(const Type *FPType) {
>> +  if (FPType == Type::FloatTy)
>> +    return 24;
>> +  if (FPType == Type::DoubleTy)
>> +    return 53;
>> +  if (FPType == Type::X86_FP80Ty)
>> +    return 64;
>> +  return -1; // Unknown/crazy type.
>> +}
>> +
>
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