[LLVMdev] Generating Floating point constants

[Stéphane Letz]

Le 3 juin 2010 à 16:00, Martin Guy a écrit :

> [off list]
> 
>> 0.8f get converted in 0x3FE99999A0000000 by LLVM
> 
> single precision
> 
>> http://babbage.cs.qc.edu/IEEE-754/Decimal.html  gives:
>> 
>> 0x3FE999999999999A  instead and this value cannot be read back by "llc"...
> 
> double precision
> 
>     M


Well 

For  float 0.8 : 

http://babbage.cs.qc.edu/IEEE-754/Decimal.html

3F4CCCCD for Single precision (32 bits):

3FE999999999999A for Double precision (64 bits):

Still different compared to LLVM...

Any idea?

Stéphane