[LLVMdev] creating 80/128bit FP constants?
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edA-qa mort-ora-y
Apr 30, 2013, 1:33:07 AM4/30/13
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How do I emit 80/128 bit FP constants. There is one ConstantFP::get
function which takes a double and another that takes a StringRef. Does
the StringRef version somehow do what I want?
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function which takes a double and another that takes a StringRef. Does
the StringRef version somehow do what I want?
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Duncan Sands
May 1, 2013, 6:21:33 AM5/1/13
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On 30/04/13 07:33, edA-qa mort-ora-y wrote:
> How do I emit 80/128 bit FP constants. There is one ConstantFP::get
> function which takes a double and another that takes a StringRef. Does
> the StringRef version somehow do what I want?
Use the one that takes an APFloat.
> How do I emit 80/128 bit FP constants. There is one ConstantFP::get
> function which takes a double and another that takes a StringRef. Does
> the StringRef version somehow do what I want?
Ciao, Duncan.
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edA-qa mort-ora-y
May 1, 2013, 6:28:31 AM5/1/13
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On 01/05/13 12:21, Duncan Sands wrote:
>> How do I emit 80/128 bit FP constants. There is one ConstantFP::get
>> function which takes a double and another that takes a StringRef. Does
>> the StringRef version somehow do what I want?
> Use the one that takes an APFloat.
APFloat then offers the float/double/string constructors, and various
>> How do I emit 80/128 bit FP constants. There is one ConstantFP::get
>> function which takes a double and another that takes a StringRef. Does
>> the StringRef version somehow do what I want?
> Use the one that takes an APFloat.
operations. I'm still not sure on how I can get a 80/128 bit float. Is
there an example somewhere?
Shuxin Yang
May 1, 2013, 1:03:14 PM5/1/13
to edA-qa mort-ora-y, llv...@cs.uiuc.edu
There are example in unittests/ADT/APFloatTest.cpp
Create 80-bit FP (on x8664, it is corresponding to "long double" in C/C++):
APFloat(APFloat::x87DoubleExtended, "0xf.fffffffp+28");
Create 128-bit:
I don't know if llvm have run-time lib support for quadruple-precision FP arithmetic.
Create 80-bit FP (on x8664, it is corresponding to "long double" in C/C++):
APFloat(APFloat::x87DoubleExtended, "0xf.fffffffp+28");
Create 128-bit:
I don't know if llvm have run-time lib support for quadruple-precision FP arithmetic.
On 5/1/13 3:28 AM, edA-qa mort-ora-y
wrote:
On 01/05/13 12:21, Duncan Sands wrote:How do I emit 80/128 bit FP constants. There is one ConstantFP::get function which takes a double and another that takes a StringRef. Does the StringRef version somehow do what I want?Use the one that takes an APFloat.APFloat then offers the float/double/string constructors, and various operations. I'm still not sure on how I can get a 80/128 bit float. Is there an example somewhere?
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