llvm dev - Jul 2013 - [LLVMdev] uitofp and sitofp rounding mode

When the uitofp and sitofp instructions convert e.g. from i64 to
float, what rounding mode do they use? Answers in the form a patch to
LangRef.html would be great!

Thanks,
Jay.

On Wed, Jul 24, 2013 at 4:03 AM, Jay Foad <jay.foad at gmail.com>
wrote:
> When the uitofp and sitofp instructions convert e.g. from i64 to
> float, what rounding mode do they use? Answers in the form a patch to
> LangRef.html would be great!
The default rounding mode, just like every other floating-point operation.

-Eli

On Jul 24, 2013, at 12:00 PM, Eli Friedman <eli.friedman at gmail.com>
wrote:
> On Wed, Jul 24, 2013 at 4:03 AM, Jay Foad <jay.foad at gmail.com>
wrote:
>> When the uitofp and sitofp instructions convert e.g. from i64 to
>> float, what rounding mode do they use? Answers in the form a patch to
>> LangRef.html would be great!
> 
> The default rounding mode, just like every other floating-point operation.
Except, of course, that the default rounding mode for an FP->integer
conversion is different than the default rounding mode on, say, an FADD. 
FP->integer conversions are round-to-zero, while FP arithmetic operations are
round-nearest-ties-to-even.

--Owen