gcc on Intel x86 and failure of -ffloat-store option

N8TM@aol.com N8TM@aol.com
Fri Dec 31 20:54:00 GMT 1999

In a message dated 12/8/99 2:07:53 PM Pacific Standard Time, 
beebe@math.utah.edu writes:

>  -ffloat-store is ignored when optimization is
>  turned on

It's not ignored, but the recent compiler versions often hoist the storage 
outside of the loop.  There are examples where -O2 causes some (but not all) 
loop variables to be subjected to rounding to 53 bits each time, while adding 
-ffloat-store causes the rounding to be postponed until after the loop.  Not 
the expected behavior.


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